METERING

Field of the invention: The present invention relates to the field of pump assemblies. More particularly, and according to a possible intended use, the present invention relates to a pump assembly capable of dosing, mixing and/or metering, and also relates to a kit with corresponding components for assembling the same, to a corresponding hydraulic circuit and/or system provided with such a pump assembly, and to corresponding methods of manufacturing, assembling and/or operating associated thereto.

Background: Pumping devices, assemblies and the like, are well known in the art.

For example, known to the Applicant are the following US patent and published patent applications: US 5,065,903; US 5,462,352; US 5,626,420; US 7,951 ,112 B2; US 7,967,022 B2; US 8,282,265 B2; US 8,974,111 B2; US 9,057,363 B2; US 9,316,216 B1 ; US 10,413,924 B2; and US 2014/0074062 A1.

Also known to the Applicant are the following German documents: DE 10 2010 023 380 A1 ; and DE 20 2015 002 469 U1. Also known to the Applicant are the following web links: https://www.pcm.eu/en/food/pcm-solutions/dosing-pumps/pcm-do svs-food-piston- pump: and https://www.dopag.us/products/2k-metering-svstems/piston-met ering- system s/economix/. Dosing, mixing and metering pumps are known to be designed and used to meter and dose and mix various types of liquids, such as water and/or other chemical product(s), but not limited thereto. It is also well known that for mixing, metering and dosing two medias, such as water and other chemical(s), for example, two pumps are required for almost all situations, one for the water and one for the chemical product, here having to use two pumps being considered a considerable drawback. Another considerable drawback associated to common metering and dosing pumps comes with the fact that today's metering pumps are not capable of constantly meter and dose liquids through time, but rather "pulsate" dosage(s) through time, thus, causing uneven concentration of liquid and product mixes. A third considerable drawback associated to common metering and dosing pumps comes from the fact they all need to be assisted by means of electrical motor or actuator devices, such as electric solenoids, to pump fluid, etc. A fourth considerable drawback associated with common metering pumps comes from the fact that having to use two pumps makes metering and mixing fluid accurately almost impossible, for the two pumps are bound to become "unsynchronized" in time, thus, producing inaccurate dosing and mixing, which is very undesirable, for obvious reasons.

Thus, it would be particularly useful to be able to provide an improved system which, by virtue of its design and components, would be able to overcome or at least minimize some of these known drawbacks associated with conventional systems.

Summary of the invention: An object of the present invention is to provide a pump assembly which, by virtue of its design and components, satisfies some of the above-mentioned need(s), and which would thus be an improvement over other related pump assemblies and/or methods known in the prior art. In accordance with the present invention, the above object is achieved, as will be easily understood from the present description, with a pump assembly (also referred to herein as "pump system" or simply "pump") such as the one briefly described herein and such as the one exemplified in the accompanying drawings.

More particularly, according to one aspect of the present invention, an object is to provide a pump assembly for use with at least one fluid, the pump assembly comprising:

a main casing;

at least one primary pump, the at least one primary pump having a main piston component sealingly mountable onto the main casing so as to define at least one primary cavity inside said main casing, the main piston component being displaceable along said main casing so as to vary a corresponding volume of said at least one primary cavity; and

at least one secondary pump, the at least one secondary pump including a hollow insert having one end being mountable onto a correspond supporting component and another end being insertable and relatively displaceable along an interior portion of a corresponding cylinder of the pump assembly so as to define a define at least one secondary cavity inside said portion of the cylinder, one end of the cylinder being rigidly connectable to the main piston component of the at least one primary pump, and another end of the cylinder being sealing mountable about an exterior portion of the hollow insert, so that a movement of the main piston component in turn results into a corresponding simultaneous movement of the cylinder, and vice versa, thereby varying a corresponding volume of the at least one secondary cavity of the at least one secondary pump accordingly, so as to pump fluid from at least one cavity of the pump assembly.

According to another aspect of the present invention, there is provided a hydraulic circuit and/or system provided with the above-mentioned pump assembly. According to another aspect of the invention, there is also provided a method of assembling and/or mounting the above-mentioned pump assembly onto a corresponding a hydraulic circuit and/or system.

According to yet another aspect of the invention, there is also provided a method of using the above-mentioned pump assembly, hydraulic circuit and/or system. According to yet another aspect of the invention, there is also provided a kit with components for assembling the above-mentioned pump assembly, hydraulic circuit and/or system.

According to yet another aspect of the present invention, there is also provided a set of components for interchanging with components of the above- mentioned kit.

According to yet another aspect of the present invention, there is also provided a method of assembling components of the above-mentioned kit and/or set.

According to yet another aspect of the present invention, there is also provided a method of doing business with the above-mentioned pump assembly, corresponding hydraulic circuit and/or system, component(s) thereof, kit, set and/or method(s).

The objects, advantages, and other features of the present invention will become more apparent upon reading of the following non-restrictive description of preferred embodiments thereof, given for the purpose of exemplification only, with reference to the accompanying drawings. Brief description of the drawings:

Figures 1 -13 are different views of various aspects, components and features of possible pump assemblies and/or different configurations thereof according to possible preferred embodiments of the present invention.

Detailed description of preferred embodiments of the invention: In the following description, the same numerical references refer to similar elements. Furthermore, for sake of simplicity and clarity, namely so as to not unduly burden the figures with several reference numbers, only some figures have been provided with reference numbers, and components and features of the present invention illustrated in other figures can be easily inferred therefrom. The embodiments, geometrical configurations, materials mentioned and/or dimensions shown in the figures are preferred, for exemplification purposes only.

Moreover, although the present invention was primarily designed for use as a pump assembly of a hydraulic circuit and/or system for dosing, mixing and/or metering purposes, with at least one fluid and/or a combination of several fluids (ex. water, chemical additive, etc.), it may be used with other objects and/or in other types of applications, as apparent to a person skilled in the art. For this reason, expressions such as "pump", "assembly", "fluid", "circuit", "dosing", "mixing", "metering", "water", "chemical additive", "chemical", "additive", etc., used herein should not be taken so as to limit the scope of the present invention and include all other kinds of objects and/or applications with which the present invention could be used and may be useful. For example, the present pump assembly could also be used as and/or with "a self-powered single pump unit", "a dual self-powered pump" and/or "four independent pulsating pumps", for instance, given that the same principle or system could be easily adapted to these types of applications, as well.

Moreover, in the context of the present invention, the expressions "pump", "assembly", "arrangement", "system", "circuit", "device", "apparatus", "product", "unit", "equipment", "tool", "method" and "kit", as well as any other equivalent expression(s) and/or compound(s) word thereof known in the art will be used interchangeably, as apparent to a person skilled in the art. This applies also for any other mutually equivalent expressions, such as, for example: a) "pumping"; "dispensing", "dosing", "mixing", "metering", etc.; b) "fluid", "liquid", "water", "chemical", "additive", "substance", product", etc.; c) "stroke", "travel", "range", "motion", etc.; d) "distance", "position", "location", etc.; e) "passage", "channel", "conduit", "path", "orifice", "hole", "flow", etc.; f) "hydraulic", "fluid", water, etc.; g) "first/second", "right/left", "left/right", etc.; h) "fastening", "securing", "restraining", "affixing", "holding", "adjusting", etc.; as well as for any other mutually equivalent expressions, pertaining to the aforementioned expressions and/or to any other structural and/or functional aspects of the present invention, as also apparent to a person skilled in the art. Also, in the context of the present description, expressions such as "can", "may", "might", "will", "could", "should", "would", etc., may also be used interchangeably, whenever appropriate, as also apparent to a person skilled in the art.

Furthermore, in the context of the present description, it will be considered that all elongated objects will have an implicit "longitudinal axis" or "centerline", such as the longitudinal axis of a shaft (or of a bore), for example, or the centerline of a coiled spring, for example, and that expressions such as "connected" and "connectable", or "mounted" and "mountable", may be interchangeable, in that the present invention also relates to a kit with corresponding components for assembling a resulting fully-assembled and fully-operational pump assembly and/or system (and/or a resulting fully-assembled and fully-operational hydraulic circuit and/or system provided with the same, etc.).

Moreover, components of the present system(s) and/or steps of the method(s) described herein could be modified, simplified, altered, omitted and/or interchanged, without departing from the scope of the present invention, depending on the particular applications which the present invention is intended for, and the desired end results, as briefly exemplified herein and as also apparent to a person skilled in the art.

In addition, although the preferred embodiments of the present invention as illustrated in the accompanying drawings comprise various components, and although the preferred embodiments of the present pump assembly and corresponding portion(s)/part(s)/component(s) as shown consist of certain geometrical configurations, as explained and illustrated herein, not all of these components and geometries are essential to the invention and thus should not be taken in their restrictive sense, i.e. should not be taken so as to limit the scope of the present invention. It is to be understood, as also apparent to a person skilled in the art, that other suitable components and cooperation thereinbetween, as well as other suitable geometrical configurations may be used for the present position-relative damper assist system and corresponding portion(s)/part(s)/component(s) according to the present invention, as will be briefly explained herein and as can be easily inferred herefrom by a person skilled in the art, without departing from the scope of the present invention.

Broadly described, and as better exemplified in the accompanying drawings, the present invention relates to a pump assembly (and/or system) capable of providing, due to its various innovative components and features, dosing, mixing and/or metering capabilities to a user of the pump assembly, in a simpler, easier, faster, more accurate, more effective, more functional, more reliable, more economical, more environmental-friendly (due to little or no waste of fluid components, etc.) and/or more versatile manner, than what is possible with other conventional systems.

List of numerical references for some of the corresponding possible components illustrated in the accompanying drawings:

I . pump assembly (or "pump system")

3. hydraulic circuit

I I . longitudinal axis

11 a. primary axis

11 b. secondary axis

13. locking device

15. recess

17. controller

19. interface

21. check valve

101. cabinet (ex. cabinet assembly and cover)

103. fluid inlet (ex. fluid inlet port - water inlet port)

105. shut-off valve (ex main shut-off valve)

107. fluid tube (ex. fluid inlet tube - water inlet tube)

109. proportional valve (ex. proportional control valve 0-10 vdc)

I I I . solenoid valve (ex. solenoid valve - water control)

113. fluid tube (ex. fluid tube to pump - water)

115. solenoid valve (ex. solenoid valve - water ejection)

117. fluid tube (ex. fluid tube from pump - water)

119. fluid tube (ex. fluid tube from solenoid 115 - water)

121. fluid (ex. fluid tube - chemical product) 123. solenoid valve (ex. solenoid valve - chemical product control)

125. fluid tube (ex. fluid tube to pump - chemical product control)

127. solenoid valve (ex. solenoid valve - chemical product ejection)

129. fluid tube (ex. fluid tube - chemical product ejection)

131. fluid tube (ex. fluid tube - chemical product ejection)

133. static mixer (ex. "T" static mixer - mixing fluids)

135. mixed fluid tube (ex. mixed fluid tube - outlet tube)

137. fluid tube (ex. fluid tube to pump - water)

139. fluid tube (ex. fluid tube from pump - water)

141. fluid tube (ex. fluid tube to pump - chemical product control)

142. tube

143. fluid tube (ex. fluid tube - chemical product ejection)

145. flowmeter (ex. flowmeter - fluid volume monitoring)

146. right proximity sensor (ex. proximity sensor - detects the pumps

piston right side full travel limit)

147. left proximity sensor (ex. proximity sensor - detects the pumps piston left side full travel limit)

200. pump (ex. primary and/or secondary pump)

200a. first primary pump

200b. second primary pump

200c. first secondary pump

200d. second secondary pump

201. base (ex. base plate of the pump assembly(ies))

203. cylinder (ex. large pump cylinder)

205. right rod/cylinder (ex. rod that also acts as a cylinder - right side)

206. left rod/cylinder (ex. rod that also acts as a cylinder - left side)

207. cylinder head (ex. water cylinder head cap containing the seal(s)) 209. right rod/cylinder sleeve (ex. sleeve insert into the rod/cylinder (205) - right side) 210. left rod/cylinder sleeve (ex. sleeve insert into the rod/cylinder (206) - left side)

211. right secondary piston (ex. piston rod insert into right cylinder sleeve

(209))

212. left secondary piston (ex. piston rod insert into left cylinder sleeve

(210))

213. right manifold block (ex. block holding the right secondary piston

(21 1 ))

214. left manifold block (ex. block holding the left secondary piston (212))

215. pump support (ex. support plate supporting the pump assembly)

217. cylinder rod (ex. holding rod for cylinder support)

219. threaded hole (ex. manifold block threaded hole for holding the

secondary piston)

221. primary pump right cavity port (ex. port leading to the primary pump right cavity)

223. primary pump left cavity port (ex. port leading to the primary pump left cavity)

225. secondary pump right cavity port (ex. port leading to the secondary pump right cavity)

227. secondary pump left cavity port (ex. port leading to the secondary

pump left cavity)

229. primary pump piston (ex. main piston inside water pump)

231. primary pump right cavity (ex. primary pump right cavity)

233. primary pump left cavity (ex. primary pump left cavity)

235. secondary pump right cavity (ex. secondary pump cylinder right cavity) 237. secondary pump left cavity (ex. secondary pump cylinder left cavity) 239. secondary pump right cavity channel (ex. secondary pump cylinder right channel)

241. secondary pump left cavity channel (ex. secondary pump cylinder left channel)

243. right secondary pump piston (ex. secondary pump piston - right side - large ratio)

244. left secondary pump piston (ex. secondary pump piston - left side - larger ratio)

245. secondary pump piston O-ring (ex. O-ring(s), secondary piston,

intended to prevent leaks)

247. wiper seal (ex. wiper seal to keep shaft clean)

249. pressure seal (ex. seal to maintain pressure inside cavity (231 ))

251. primary pump cylinder O-ring (ex. main pump cylinder O-ring(s) for sealing)

253. primary pump cylinder shaft O-ring (ex. main pump cylinder shaft 0- ring(s) for sealing shaft (205) with piston (229))

255. pumps link plate (ex. plate linking both pumps together for combined identical motion)

257. rinsing valve (ex. solenoid valve to allow system rinsing after use)

259. primary pump cylinder (ex. primary pump rod (replace 205 and 206))

261. secondary pump cylinder rod (ex. secondary pump rod (replace 205 and 206))

263. secondary pump cylinder (ex. secondary pump cylinder (replace 209 and 210))

265. secondary pump piston (ex. secondary pump piston (replace 211 , 212, 243 and 244))

Broadly described, the present system, as exemplified in the embodiments of the accompanying drawings, relates to the field of dosing, mixing and metering pumps, and more particularly, according to a given variant, relates to a pump assembly (1 ) being capable of self-actuation with an embodiment that incorporates dual positive displacement reciprocating pumps mounted on the same axis of displacement, this embodiment providing extremely high level of accuracy mixing and dosing liquids, even at very low pumping volume, while providing constant pumping, dosing and mixing through time.

Indeed, as will be better appreciated when reviewing the present specification and accompanying drawings, the present system is advantageous in that it relates to a new dosing, metering and mixing pump assembly (1 ) that, due to its various components and features, and corresponding innovative design, is capable of dosing, metering and/or mixing of various types of liquid(s) with a high level of accuracy under constant flow through time, delivering a steady and constant dosage and mix flow, even under the smallest flow requirement while not having to rely on any mechanical devices, such as electric motors, actuators or solenoids, for example, to execute pumping, the present system (1 ) being further capable of using media pressure, such as tap water pressure, for example, to actuate and accomplish pumping of both fluids.

The present system may come in the form of a pump assembly (1 ), and/or any other possible embodiment(s) and/or expression(s), including one and/or several of the following possible components and features (and/or different possible combination(s) and/or permutation(s) thereof):

1. A pump assembly (1 ) for use with at least one fluid, the pump assembly (1 ) comprising:

a main casing (203);

at least one primary pump (200), the at least one primary pump (200) having a main piston component (229) sealingly mountable onto the main casing (203) so as to define at least one primary cavity (231 ,233) inside said main casing (203), the main piston component (229) being displaceable along said main casing (203) so as to vary a corresponding volume of said at least one primary cavity; and at least one secondary pump (200), the at least one secondary pump (200) including a hollow insert (211 ,212) having one end being mountable onto a correspond supporting component (213,214) and another end being insertable and relatively displaceable along an interior portion of a corresponding cylinder (205,206) of the pump assembly (1 ) so as to define a define at least one secondary cavity

(235.237) inside said portion of the cylinder (205,206), one end of the cylinder (205,206) being rigidly connectable to the main piston component (229) of the at least one primary pump (200), and another end of the cylinder (205,206) being sealing mountable about an exterior portion of the hollow insert (211 ,212), so that a movement of the main piston component (229) in turn results into a corresponding simultaneous movement of the cylinder (205,206), and vice versa, thereby varying a corresponding volume of the at least one secondary cavity (233,237) of the at least one secondary pump (200) accordingly, so as to pump fluid from at least one cavity

(231.233.235.237) of the pump assembly (1 ).

2. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the main casing (203) of the pump assembly (1 ) is fixed with respect to a base component (201 ) of the pump assembly (1 ), and wherein the cylinder (205,206) is movable with respect to said base component (201 ).

3. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the cylinder (205,206) is movable with respect to the base component (201 ) in a reciprocating manner.

4. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the interior portion of the cylinder (205,206) intended to receive the hollow insert (211 ,212) is provided by a corresponding sleeve (209,210) being removably insertable into a corresponding inner part of the cylinder (205,206) so as to selectively establish a volumetric ratio between the primary cavity (231 ,233) of the at least one primary pump (200) and the secondary cavity (235,237) of the at least one secondary pump (200).

5. A pump assembly (1 ) according to any one of the preceding combination(s), wherein a dispensing ratio of fluids of the pump assembly (1 ) is adjustably selected by configuring a volumetric ratio of the primary and secondary cavities (231 ,233,235,237) accordingly, so that a displacement of the main piston component (229) of the least one primary pump (200) of the pump assembly (1 ) in turn provides a direct and exact proportional displacement of the least one secondary piston pump (200) of the pump assembly (1 ).

6. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the at least one primary pump (200) is provided with a port (221 ,223) for allowing entry of primary fluid from a source of primary fluid into the at least one primary pump (200) and corresponding at least one primary cavity (231 ,233), and for allowing egress of said primary fluid from said corresponding at least one primary cavity (231 ,233) and at least one primary pump (200) via the port (221 ,223) thereof. 7. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (221 ,223) of the at least one primary pump (200) is provided about a cylinder head (207) being sealingly mountable about one end of the main casing (203). 8. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the cylinder head (207) is provided adjacent to a corresponding pump support (215) of the pump assembly (1 ). 9. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the pump assembly (1 ) comprises first and second pump supports (215) being connectable to one another via at least one cylinder-rod (217). 10. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second pump supports (215) of the pump assembly (1 ) are connectable one another via four cylinder-rods (217).

11. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the at least one secondary pump (200) is provided with a port (225,227) for allowing entry of secondary fluid from a source of secondary fluid into the at least one secondary pump (200) and corresponding at least one secondary cavity (235,237), and for allowing egress of said secondary fluid from said corresponding at least one secondary cavity (235,237) and at least one secondary pump (200) via the port (225,227) thereof

12. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (225,227) of the at least one secondary pump (200) is provided about the one end of the hollow insert (211 ,212) being mounted onto the correspond supporting component (213,214).

13. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the correspond supporting component (213,214) includes a manifold (213,214).

14. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the hollow insert (211 ,212) is rotatable about the manifold (213,214). 15. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the hollow insert (211 ,212) is provided with a recess for receiving a corresponding locking device (13) intended to prevent longitudinal displacement of the hollow insert (211 ,212).

16. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the at least one primary pump (200) comprises first and second primary pumps (200a, 200b) each having a respective primary cavity (231 ,233), so as to provide the pump assembly (1 ) with first and second primary cavities (231 ,233), the first and second primary pumps (200a, 200b) sharing the same main piston component (229), so that corresponding volumes of said first and second primary cavities (231 ,233) are variable via a corresponding displacement of the main piston component (229) along the main casing (203).

17. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the main piston component (229) is movable with respect to a base component (201 ) of the pump assembly (1 ) in a reciprocating manner.

18. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the at least one secondary pump (200) comprises first and second secondary pumps (200c, 200d) each having a corresponding cylinder

(205,206), hollow insert (211 ,212) and associated secondary cavity (235,237), so as to provide the pump assembly (1 ) with first and second cylinders (205,206), first and second hollow inserts (211 ,212), and first and second secondary cavities (235,237), the first hollow insert (211 ) having one end being mounted onto a correspond first supporting component (213) and another end being insertable and relatively displaceable along an interior portion of the first cylinder (205) of the pump assembly (1 ) so as to define the first secondary cavity (235) inside said portion of the first cylinder (205), the second hollow insert (212) having one end being mounted onto a correspond second supporting component (214) and another end being insertable and relatively displaceable along an interior portion of the second cylinder (206) of the pump assembly (1 ) so as to define the second secondary cavity (237) inside said portion of the second cylinder (206), one end of the first cylinder being operatively connectable to the main piston component (229) of the first primary pump (200a), and another end of the first cylinder (205) being sealing mountable about an exterior portion of the first hollow insert (211 ), one end of the second cylinder (206) being operatively connectable to the main piston component (229) of the second primary pump (200b), and another end of the second cylinder (206) being sealing mountable about an exterior portion of the second hollow insert (212), so that movement of the main piston component (229) in turn results into a corresponding simultaneous movement of the first and second cylinders (205,206), and vice versa, thereby varying corresponding volumes of the first and second secondary cavities (235,237) of the secondary pumps (200c, 200d) accordingly.

19. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the main casing (203) of the pump assembly (1 ) is fixed with respect to a base component (201 ) of the pump assembly (1 ), and wherein the first and second cylinders (205,206) are movable with respect to said base component (201 ).

20. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second cylinders (205,206) are movable with respect to the base component (201 ) in a reciprocating manner.

21. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the interior portion of the first cylinder (205) intended to receive the first hollow insert (211 ) is provided by a corresponding first sleeve (209) being removably insertable into a corresponding inner part of the first cylinder (205) so as to selectively establish a volumetric ratio between the first primary cavity (231 ) of the first primary pump (200a) and the first secondary cavity (235) of the first secondary pump (200c), and wherein the interior portion of the second cylinder (206) intended to receive the second hollow insert (212) is provided by a corresponding second sleeve (210) being removably insertable into a corresponding inner part of the second cylinder (206) so as to selectively establish a volumetric ratio between the second primary cavity (233) of the second primary pump (200b) and the second secondary cavity (237) of the second secondary pump (200d). 22. A pump assembly (1 ) according to any one of the preceding combination(s), wherein dispending ratios of fluids of the pump assembly (1 ) are adjustably selected by configuring volumetric ratios of a corresponding pair of primary and secondary cavities (231 ,233; 235,237) accordingly, so that a displacement of the main piston component (229) of given primary pump (200a, 200b) of the pump assembly (1 ) in turn provides a direct and exact proportional displacement of a given associated secondary piston pump (200c, 200d) of the pump assembly (1 ).

23. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second primary pumps (200a, 200b) are aligned with respect to one another and displaceable along a common primary axis (11 a), and wherein the main piston component (229) is displaceable along said common primary axis (11 a). 24. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second secondary pumps (200c, 200d) are aligned with respect to one another and displaceable along a common secondary axis (11 b), and wherein the main piston component (229) is displaceable along said common secondary axis (11 b). 25. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second primary pumps (200a, 200b), as well as the first and second secondary pumps (200c, 200d), are aligned with respect to one another and displaceable along a common longitudinal axis (11 ) of the pump assembly (1 ).

26. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first primary pump (200a) is provided with a port (221 ) for allowing entry of first primary fluid from a source of first primary fluid into the first primary pump (200a) and corresponding first primary cavity (231 ), and for allowing egress of said first primary fluid from said corresponding first primary cavity (231 ) and first primary pump (200a) via the port (221 ) thereof.

27. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (221 ) of the first primary pump (200a) is provided about a first cylinder head (207) being sealingly mountable about a first end of the main casing (203).

28. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first cylinder head (207) is provided adjacent to a corresponding first pump support (215) of the pump assembly (1 ).

29. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the second primary pump (200b) is provided with a port (223) for allowing entry of second primary fluid from a source of second primary fluid into the second primary pump and corresponding second primary cavity (233), and for allowing egress of said second primary fluid from said corresponding second primary cavity (233) and second primary pump (200b) via the port (223) thereof. 30. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (223) of the second primary pump (200b) is provided about a second cylinder head (207) being sealingly mountable about a second end of the main casing (203).

31. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the second cylinder head (207) is provided adjacent to a corresponding second pump support (215) of the pump assembly (1 ).

32. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second pump supports (215,215) are connectable to one another via at least one cylinder-rod (217).

33. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first and second pump supports (215,215) of the pump assembly (1 ) are connectable one another via four cylinder-rods (217).

34. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the source of first primary fluid and the source of second primary fluid is the same source.

35. A pump assembly (1 ) according to any one of the preceding combination(s), wherein each primary fluid is water.

36. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the first secondary pump (200c) is provided with a port (225) for allowing entry of first secondary fluid from a source of first secondary fluid into the first secondary pump (200c) and corresponding first secondary cavity (235), and for allowing egress of said first secondary fluid from said first secondary cavity (235) and first secondary pump (200c) via the port (225) thereof 37. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (225) of the first secondary pump (200c) is provided about the one end of the first hollow insert (211 ) being mounted onto the correspond first supporting component (213).

38. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the correspond first supporting component (213) includes a first manifold (213).

39. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the first hollow insert (211 ) is rotatable about the first manifold (213). 40. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the first hollow insert (211 ) is provided with a recess (15) for receiving a corresponding first locking device (13) intended to prevent longitudinal displacement of the first hollow insert (211 ). 41. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the second secondary pump (200d) is provided with a port (227) for allowing entry of second secondary fluid from a source of second secondary fluid into the second secondary pump and corresponding second secondary cavity (237), and for allowing egress of said second secondary fluid from said second secondary cavity (237) and second secondary pump (200d) via the port

(227) thereof.

42. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the port (227) of the second secondary pump (200d) is provided about the one end of the second hollow insert (212) being mounted onto the correspond second supporting component (214).

43. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the correspond second supporting component (214) includes a second manifold (214) of the pump assembly (1 ).

44. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the second hollow insert (212) is rotatable about the second manifold (214).

45. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the one end of the second hollow insert (212) is provided with a recess (15) for receiving a corresponding second locking device (13) intended to prevent longitudinal displacement of the second hollow insert (212).

46. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the source of first secondary fluid and the source of second secondary fluid is the same source.

47. A pump assembly (1 ) according to any one of the preceding combination(s), wherein each secondary fluid is a chemical additive to be mixed with water.

48. A pump assembly (1 ) according to any one of the preceding combination(s), wherein the pump assembly (1 ) is symmetrical about a central transversal plane.

49. A kit with corresponding components for assembling a pump assembly (1 ) according to any one of the preceding combination(s) 50. A hydraulic circuit (3) provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the hydraulic circuit is further provided with a corresponding controller (17) for selectively controlling opening and closing of each port (221 ,223, 225,227) of the pump assembly (1 ).

51. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the hydraulic circuit (3) includes at least one proximity sensor (146,147) associated to each cylinder (205,206) of each secondary pump (200c, 200d), the at least one proximity sensor (146,147) being operatively connected to the controller (17) for sending a detection signal to said controller (17).

52. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein each port (221 ,223, 225,227) is operatively provided with a corresponding valve (111 , 115, 123, 127) being operatively connected to the controller (17) for receiving a command signal from said controller (17).

53. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the corresponding valve (111 ,115,123,127) is a valve selected from the group consisting of solenoid valves, diaphragm valves, pneumatic valves and mechanical valves.

54. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the corresponding valve (111 , 115, 123, 127) is a 3-way and 2-position solenoid valve.

55. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the hydraulic circuit is provided with at least one component selected from the group consisting of fluid inlet (103), shut-off valve (105), proportional valve (109), check valve, (21 ) rinsing valve (257), flowmeter (145), mixer (133) and discharge component (135).

56. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein at least one of the shut-off valve (105), proportional valve (109), rinsing valve (257) and flowmeter (145) are operatively connected to the controller (17).

57. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the controller (17) is provided with a user interface (19) for controlling different parameters of the hydraulic circuit (3).

58. A hydraulic circuit (3) being provided with a pump assembly (1 ) according to any one of the preceding combination(s), wherein the controller (17) is capable of operating the hydraulic circuit (3) and corresponding pump assembly (1 ) in various operating modes.

59. A hydraulic circuit (3) according to any one of the preceding combination(s), wherein the controller (17) is operated to use the pump assembly (1 ) as a self-powered single pump unit.

60. A hydraulic circuit (3) according to any one of the preceding combination(s), wherein the controller (17) is operated to use the pump assembly (1 ) as a dual self-powered pump.

61. A hydraulic circuit (3) according to any one of the preceding combination(s), wherein the controller (17) is operated to use the pump assembly (1 ) as four independent pulsating pumps. 62. A hydraulic circuit (3) according to any one of the preceding combination(s), wherein the controller (17) is operated to use the pump assembly (1 ) in a rinsing mode. Other possible aspect(s), object(s), embodiment(s), variant(s) and/or advantage(s) of the present invention, all being preferred and/or optional, are briefly summarized hereinbelow.

For example, an object of the present invention can be to provide a dosing, metering and mixing pump in the form and embodiment of two positive displacement reciprocating pumps, these two pumps including two cavities each and mechanically working together and pumping fluid by reciprocate positive displacement.

Another object of the present invention can be to provide a metering and dosing pump, having one of the pumps being of smaller volume compared to the other pump, the difference in volume between each pump in respect to a desired mixing volume ratio between the two pumps.

Another object of the present invention can be to provide a metering and dosing pump that can meter, dose and mix any type(s) of liquid(s) constantly through time, this meaning that it will not pulsate its flow through a given time frame, but constantly and steadily deliver dosage and mixes, even under the smallest flow requirement and through any given time. Another object of the present invention can be to provide a metering and dosing pump not having to rely on any mechanical sources such as electric motors, actuators or solenoids to execute pumping, but can use one of the media's pressure to actuate and accomplish pumping of both fluids, and as it can use tap water pressure, for example, to power and actuate itself and pump. The dosing pump assembly (1 ) according to the present system has two known cavity chambers on each side of the larger diameter piston that all together form a reciprocating positive-displacement pump body. The reciprocating positive- displacement piston can be moved by means of a positive-displacement drive, e.g., such as an actuator drive, but an important aspect of one object of the present system is that it does not necessarily need such motor or actuator to pump, but instead can use water pressure to provide motion force, given water is one of the media or fluid used, for example. As the water under pressure enters one of the large volume cavities, the positive displacement piston travels to the other side of the pump's assembly (200), and thus, collapsing the cavity on the other side of the piston to eject water from that opposite side, this ejected water then being used in the mixing and dosing process. Then, the water pressure is transferred to the collapsing side of the pump once the proximity sensor detects a full travel, this cavity then expands to move the piston towards the other side that in turns reduces and collapses the opposite side cavity so water from this side is then ejected from the cavity.

This side-to-side positive displacement cycle is created by alternatively transferring water pressure from one side of the pump to its other side, creating an oscillation motion that creates the pumping effect, this water pressure transfer being controlled by solenoid valve(s) and automation of the system further detailed in the schematic hereafter, and controlling the speed of the pump is achieved by regulating that media's pressure and flow volume, here being water pressure and by means of regulating its pressure using a proportional valve, for example, here to be controlled by the system's automation, but not limited to, as manual valves could also be used to create a manual pump for the same application and use, etc. According to a given possible embodiment of the present system, an object can be to provide two pumps in one and positioned on the same central axis, but not limited to, since the two pumps can also be positioned side by side while still be powered by media or water pressure and fill a main possible objective of the present system. However, an objective of this possible embodiment with providing two pumps within a single pump assembly on the same central axis, and that each pump can either be of identical displacement volume to create a dosing and mixing pump of equal ratio between the medias, or having the two pumps of different and unequal displacement volumes to create a dosing and mixing pump assembly of unequal mixing ratio, this by means of designing and fabricating the two pumps each having a different volume or different piston and cylinder's physical diameters.

According to a given possible embodiment of the present system, one can have both pumps to be mechanically joined together so as the driver pump travels to one side the second pump follows with the same motion and same speed or velocity in order to perform accurate fluid mixing, the second and driven pump operating under the same and exact principal of the driver pump, with the only exception that the driven pump operates under no positive pressure and pumps the fluid simply by means of suction and ejection of the media, a principle of operation that will become more apparent in the detailed description hereunder, and as identical to the driver pump, the fluid direction in which it travels either to fill the expanding cavity of the driven pump or to be ejected from the driven pump is controlled by means of solenoid valves opening or closing depending of the travel direction of the pumps that here to alternate according the automation system alternative sequence, as long as the sequence is identical for each the driver and the driven pump and all too apparent and further detailed in the schematic hereunder.

According to a given possible embodiment of the present system, an object can also be to provide a pump assembly in a single embodiment that provide the highest level of accuracy both in terms dosing precision and mixing precision, the dosing precision accomplished by this system's feature that it does not pulsate its flow, but ejects a constant flow through time, and with the example that if one ("1 ") milliliter of mix fluid is required for one ("1 ") minute of time, this pump assembly will eject and dispense that one ("1 ") milliliter of mix fluid in 1/60 milliliter per second or even more accurately if the expert in the art wishes to divide the time further such as 1/1000 of a milliliter per .0001 second if one wishes to, and as the present system will provide constant flow through any time frame desired, and it does so from its feature that it is the accuracy of the media pressure and volume the present system uses to power the driver pumps that establishes the driver pump's motion and which in turns establishes the driven pump's displacement, and in such measure, establishes the accuracy of the flow coming out the pumps. In a most simple way of saying, one can say that this pump assembly will reproduce the accuracy used to drive the pump using fluid power. If the fluid used to power the pumps is provided under high accuracy, this pump assembly will provide the same identical accuracy and so on for lower accuracy and/or much higher accuracy.

As for the mixing process accuracy objective of the present system, it is simply achieved by means of having two pumps in a single embodiment assembly that are physically different or equal in terms of physical displacement volumes, thus, a physical aspect that cannot change through normal operation. Expressed with this following example, if the driver pumps is three ("3") times bigger in displacement volume then its driven pump, the fluid vs media or product mixing ratio of this pump unit will be 3 to 1 or 3:1 and will never change until the displacement volume of one of the two pumps is altered by mechanically changing the volume, thus, one can understand that this invention cannot only provide a highly accurate mixing ratio such as three ("3") to one ("1 ") or 3:1 using the above example, but it can also provide an extremely highly accurate mixing ratio such as 3.0 to 1.0 or 3.0:1.0 mixing ratio and much better considering the stability of any mechanical structure and assembly.

The present disclosure further relates to a method for controlling a positive- displacement pump using a driver pump physically and mechanically attached to a driven pump, and optionally, involving solenoid valves, a pressure regulator valve, a flow meter and two proximity detectors, all these sub-components well known in the field being linked to an artificial intelligence such as a Programable Logic Controller or PLC, that acts so it monitors the proximity detectors to establish the driver pump's piston position so to control the solenoid valves in a way that once the driver pump's piston has reached an end travel, the PLC detects that position from the proximity detector sending the signal so the PLC can now divert media pressure to the other side of the driver pumps so it now travels toward the opposite direction until it reaches the other proximity detector, and so on alternatively from one side to another, etc.

The present disclosure further relates to a method for controlling a positive- displacement pump and where the PLC also establishes the pump's speed or flow output volume using a proportional regulating valve to regulate the media pressure driving the driver pump in a way that more pressure is provided to the driver pumps, the faster it will travels from one side to another and higher the output flow will be, and where the least pressure the PLC will apply to the driver pumps through the proportional regulator valve, the lower will be the speed the pump will travel, and therefore, the output flow will be lower.

This disclosure also describes a method in which the PLC also establishes the speed or the output flow of the pumps using a flowmeter monitoring the pump's output flow so it can regulate the pumps speed or output flow compared to the output flow requirement provided to the present system by the user through an interface control panel, these methods easily understood by a person skilled in the art and being commonly used.

The present system will be further described by way of examples described below based on the accompanying figures. The various features of innovative nature which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.

Furthermore, before further description of the present system continues, it is desired to clarify the following points: here, and for the purpose of understanding and clarity for the present specification, the fluid providing power to the system (1 ) will be "water" (given as a first possible fluid), the fluid that needs to be diluted and mixed will be "chlorine" (given as a second possible fluid, chemical additive, for example), and the mixing ratio will be one ("1 ") part of chlorine for thirty-five ("35") part of water, or a mixing ratio of 35:1 as usually expressed in certain fields, and therefore, one will understand that the present pump assembly(ies) (1 ) and corresponding specification and examples, will provide that 35:1 mixing ratio.

It is also important to establish that for the purpose of the present specification and for the present system, one of the fluids is provided to the pump assembly(ies) (200) under positive pressure, this fluid for the present specification to be water, and the chlorine circuit here is under no pressure but simply at ambient atmospheric pressure, for example.

Further, it is also important to highlight the present specification will not detail the programable logic control or PLC for they are well known in the art.

Another point to highlight is that for the purpose of the present specification and the present assembly (1 ), the solenoid valves (111 , 115, 123, 127) are three- ways two-positions solenoid valves that are electrically connected so they are all "open" at the same time and will all "close" on an electrical signal from the PLC, thus, each valve has a normally open circuit, and a normally closed circuit internally. Referring now to the drawings, and more specifically to Fig. 1 , this figure shows the present pump assembly (1 ) into a cabinet (101 ) which can be of any sort of cabinet as long as it serves the purpose of holding, enclosing and to protect the components and the pump assembly(ies) (1 ). Still referring to Fig. 1 and further detailed in Fig. 2, the present pump assembly (1 ) is shown along with components mechanically attached to the cabinet (101 ). These components constitute a specific hydraulic system that serves the purpose of actuating the pump assembly(ies) (1 ). The hydraulic circuitry begins with a solenoid valve (105) having a fluid port (103) to which regular water supply under pressure is connected to. Once the system (1 ) is put to operation, the solenoid valve (105) opens to allow water to flow to the proportional valve (109) through the water inlet tube (107).

The proportional valve (109), for this example, is a 0 to 10 volts DC regulator valve that will modulate water pressure and flow according the strength of the voltage signal it receives from the control logic (not shown), 0 volts indicating no flow and pressure are required and 10 volts signal indicating the pump assembly(ies) (1 ) must provide full flow capacity. Still referring to Figs. 1 and 2, as the proportional valve (109) receives a voltage signal to "open", the proportional valve (109) will let water flow and pressure travel through fluid tube (107) to the normally open solenoid valve (111 ) taking care of directing water under pressure to one side of the pump assembly(ies) (200) or the other side depending of the signal it receives from the PLC. Water then reaches solenoid valve (111 ) which is normally "open", thus, allowing water to flow towards the pump assembly(ies) (1 ) through fluid tube (113) and enters the pump assembly(ies) (1 ) to put the pump assembly(ies) (1 ) in motion toward the opposite side to the water pressure entrance. The water already present in the opposite cavity of the pump assembly(ies) (1 ) is then ejected from the pump assembly(ies) (200) through fluid tube (117) and flowing through the normally open solenoid valve (115) and out solenoid valve (115) through fluid tube (119) which is connected to a flowmeter (145) shown in Figs. 10, 11 , 12 and 13 only, then water flows out the flowmeter (145) toward a static mixer (133), and this is the point the present specification will now discuss the chlorine circuit before going any further through the static mixer (133). For the purpose of understanding, the flowmeter (145) can be of any type, as long as it serves the purpose of the present system and is used to monitor fluid volume coming out the pump assembly(ies) (1 ), etc. Still referring to Figs. 1 and 2, the present specification now describes the chlorine circuit which begins with a fluid tube (121 ) to which a chlorine reservoir or container (not shown) is connected. As the pump assembly(ies) (1 ) travel(s) towards one side of the system (1 ), the pump assembly(ies) (1 ) also create(s) a vacuum inside fluid tube (121 ) that sucks the chlorine out it reservoir and through fluid tube (121 ) toward solenoid valve (123) which directs chlorine to one side of the pump assembly(ies) (1 ) by means of suction through tube (125) only visible in Fig. 2, or the other side of the pump assembly(ies) (1 ) through tube (141 ), depending if the solenoid valve (123) receives an electrical signal or not from the PLC. Discussing the pump assembly(ies) (1 ) operation principal will become more apparent when further described hereunder using later figures, but for now the present specification will limit itself to discuss and detail the chlorine circuit hydraulics.

As the pump assembly(ies) (1 ) moves toward one direction and charges one side of the chlorine circuit and the chlorine pump cavity through tube (125), the chlorine present in the opposite side of the pump assembly(ies) (1 ) is then ejected from the pump assembly(ies) (1 ) through fluid tube (129) towards and through solenoid valve (127) and through fluid tube (131 ) toward the static mixer (133). At this point, both water and chlorine are now present in the static mixer (133) which like said, serves to mix water and chlorine together, then the water/chlorine mixture is then ejected through the fluid tube (135) toward the user's device or use. This hydraulic operation and fluids dynamic and direction can be understood further easier referring to Fig. 10, and more specifically with Fig. 11 which provides a hydraulic flow path highlighted using arrows for clarity.

Still referring to Fig. 1 , and as the pump assembly(ies) (1 ) piston (229) of Fig. 4 and rod/cylinder (206) reaches its proximity sensor (147), the proximity sensor (147) sends an electrical signal to the PLC that then energize(s) solenoid valves (111 , 115, 123, 127) that simultaneously close one port to open the other port. At this point, solenoid valve (111 ) redirects water pressure still present and supplied by tube (107), to tube (137) instead of (113), so now the pump assembly(ies) (1 ) cycle(s) towards the opposite direction. As solenoid valve (115) has also switch ports, water from the opposite side of the pumps (200) can now exit the pumps (200) opposite cavity by flowing through tube (139) then through solenoid valve (115) to tube (119) towards the flowmeter (145), then through the static mixer (133) and outlet tube (135).

Identically as explained hereabove for the chlorine circuit, but for the opposite side, solenoid valve (123) hereto has changed position taking chlorine still present and supplied by tube (121 ), but now redirects the chlorine flow through tube (141 ) to charge the opposite side chlorine cavity with chlorine. Flereto solenoid valve (127) has changed position so chlorine coming out of the cavity previously filled by tube (125), is now being ejected through tube (142) only shown in Fig. 2, towards solenoid valve (127) then through tube (131 ) toward the static mixer (133), and hereto at this point, then the water/chlorine mixture is then ejected through the fluid tube (135) toward the user's device or use. This hydraulic operation and fluids dynamic and direction can be understood further easier referring to Fig. 10 and more specifically with Fig. 12 which provides a hydraulic flow path highlighted using arrows for clarity.

And as the rod/cylinder (205) reaches the right-side proximity sensor (146), the PLC then de-energizes solenoid valves (111 , 115, 123, 127) which then switch to their original position and the cycle as described hereabove starts over and so on.

Now referring to Fig. 3 of the present specification, to further detail mechanical construction of the pump assembly (1 ) mechanical construction in which there may be four (4) independent and individual pumps or two ("2") pair of pumps or one ("1 ") single pump depending on how it best serves various applications needs and purposes, these pumps and/or combination(s) of pump(s) and concept further detailed and becoming more apparent in Fig. 4 hereafter. Fig. 3 illustrates a pump assembly(ies) (1 ) consisting of a base plate (201 ) that serves to support and hold the pump assembly(ies) (1 ) various components in place by means of holding two pump supports (215) that holds the two primary pump cylinder (203) heads (207) in place and well centered and aligned. Inside the primary pump cylinder (203) is a piston (229) not visible here, but on which the rod/cylinders (205, 206) are attached to form a positive displacement reciprocating primary pump (200), and the four (4) cylinder rods (217) here shown as holding elements to keep the primary pump assembly(ies) (200) together, although other means of attachments to be suitable as long as they serve their purpose.

Also illustrated in Fig. 3 and part of the pump assembly(ies) (200), are components that serve and form the two ("2") secondary pumps which are partially visible in Fig. 3 but perfectly detailed in Fig. 4, these components including a rod/cylinder (205) sleeve (209), and here, it is worth mentioning that the rod/cylinders (205, 206) bare this designation for the reason that they first act as normal hydraulic cylinder rods like into any regular hydraulic cylinder, but also act as cylinders, for the secondary pumps piston (211 ) and sleeve (209).

To pursue, the rod/cylinder sleeves (209) are positioned and locked into the rod/cylinder (205) and serve as cylinder to the secondary pump piston (211 , 212), and which in turns are fixed to the structure, the right secondary pump's piston (211 ) held fix by the right manifold block (213) and the left secondary pump's piston (212) held fix by the left manifold block (214), both left and right secondary pump's pistons (211 , 212) held fix by means of full dog or half dog setscrews (and/or any other suitable locking device) screwed and/or inserted in manifold block (213, 214) holes (219) and locking the pistons (211 , 212) so they cannot exit their respective manifold block (213, 214) in a longitudinal motion but have sufficient freedom to rotate, this principle being more apparent with Fig. 4.

Also illustrated in Fig. 3 are ports for each pump that act in both as inlet ports and outlet ports depending of the pump assembly(ies) (1 ) operation cycle, and here to be described as the primary pump's inlets and outlets ports (221 ) and (223), these ports and purposes further detailed in the following Fig. 4, and also the secondary pump's inlets and outlets ports (225, 227), hereto to be further detailed in Fig. 4 hereafter.

Before detailing Fig. 4, it is worth providing further details on certain components interaction and their purpose establishing the pump assembly (1 ) mixing ratio, which here was preliminary established to be thirty-five ("35") parts of "water" (for example) for one ("1") part of chlorine (for example), and here established by altering the volume of the secondary pump's cavities (235, 237) in relation of the primary pump's cavities (231 , 233), and which is the sole purpose of the secondary pump sleeves (209, 210) that can be altered to desired internal diameters, internal diameters that will automatically alter the sleeves (209, 210) cavities (235, 237) volume, and volumes that in relation to the primary pumps (200) fix cavities (231 , 233) volumes, establishes the pump assembly(ies) (1 ) mixing ratio. It is then to be understood that cavity (235) volume is thus thirty-five ("35") times smaller than cavity (231 ) volume, and equivalently for and between cavities (237, 233).

Now to further detail what was described in Fig. 3 and more obvious now with Fig. 4 as shown here, one can witness the pump assembly(ies) (1 ) including its base (201 ) on which is assembled the primary pump's cylinder (203) between the two cylinder heads (207), the cylinder (203) and cylinder heads (207) held in place by two pumps supports (215) serving to attach and fix the pump's cylinder (203), cylinder heads (207) to the base (201 ). To ensure the cylinder heads (207) are well seated on the cylinder (203), the pump supports (215) are held in place by four threaded cylinder rods (217). Passing through the cylinder heads (207) are a right rod/cylinder (205) and a left rod/cylinder (206) attached to each side of the primary pump piston (229), this piston (229) dividing the cylinder (203) into two specific cavities, the primary pump right cavity (231 ) and the left primary pump cavity (233), this arrangement at this point being nothing more than a standard hydraulic cylinder (200) or a reciprocating positive displacement pump (200), here easily recognized by any expert in the art.

Also attached and fixed to the base (201 ) are the right manifold block (213) and the left manifold block (214), their intended purpose being to first fix both right secondary piston (211 ) and left secondary piston (212) in place well centered with their respective right rod/cylinder (205) and left rod/cylinder (206), these right and left manifolds (213, 214) also having the purpose of transferring the chlorine to and from their respective secondary pistons (211 , 212) cavities (239, 241 ), to and from the solenoid (123, 127) as described hereabove in detail in Fig. 1 and Fig. 2. The right secondary pump piston (211 ) and the left secondary pump piston (212) are basically small hollow rods each having their respective channels (239, 241 ) through which the fluid, here "chlorine" (used as a possible "example" only for the present disclosure), travels through when their respective cavities (235, 237) are either contracted or expanded, the secondary pump right cavity (235) being formed by the internal hollow diameter of the right rod/cylinder sleeve (209) and the secondary pump left cavity (237) here being formed by the left rod/cylinder sleeve (210), these sleeves (209, 210) manufactured from any material types as long as they serve the purpose of this invention as being interchangeable sleeves (209, 210) that can be easily replaced with sleeves (209, 210) having a different internal diameter and volume, which compared to the primary pump cylinder (203) diameter and volume, establishes the ratio between the primary pump and the secondary pump, as can be easily understood by a person skilled in the art.

Still referring to Fig. 4 and to further describe this figure more accurately, one will understand that some components in this pump assembly(ies) (1 ) are fixed and not moving, and some other components are moving, this aspect of the present system being advantageous and different to the present system, and understanding that the only moving components in the present system are the primary pump piston (229) the right rod/cylinder (205) and its respective right rod/cylinder sleeve (209), the left rod/cylinder (206) and its respective left rod/cylinder sleeve (210). All other components of the pump assembly(ies) (200) are "fixed" and "stationary", and it is the interaction between the fix components and the moving components that are advantageous and different to the present system.

Still referring to Fig. 4, the present specification will now describe the operation process and interaction between certain components to further enhance understanding for this embodiment, and for which for best understanding of the following, is to establish that cavities (231 , 233, 235, 237), along with channels (239, 241 ) are already full of their respective fluids like if the pump assembly(ies) (1 ) had already cycled a few cycles. Another reminder for the present description and like mentioned hereabove detailing Figs. 1 and 2, is that all solenoid valves (111 , 115, 123, 127) have the same status being normally "open" when deenergized, and "closed" to redirect flow the second way and as they operate simultaneously all together, except solenoid valve (105) of Fig. 1 who acts as a gate valve.

The process begins with water pressure coming from the solenoid valve (111 ) of Fig. 2 and enters the primary pump right cavity port (221 ) leading into the primary pump right cavity (231 ), this water pressure increasing and pushing against the primary pump piston (229) and causes the primary pump right cavity (231 ) to expand as the primary piston (229) wants to move in such way that it also collapses the primary pump left cavity (233) and as the water in the primary pump left cavity (233) exits this cavity through the primary pump left cavity port (223) since its associated solenoid valve (115) of Fig. 2 is also "open", this water then directed toward the static mixer (133) of Fig. 3 through the tube (119) hereto of Fig. 2, here with one water cycle of the present system completed.

From that same motion and water cycle as described hereabove, this action causes the right rod/cylinder (205) along with its right rod/cylinder sleeve (209), and the left rod/cylinder (206) and its left rod/cylinder sleeve (210) to move in the same direction of the primary pump piston (229), causing the secondary pump right cavity (235) to expand as the right secondary piston (211 ) is fixed and does not move, creating a suction or vacuum effect in the secondary pump right cavity (235), this vacuum transferred in the secondary pump right cavity channel (239) and in the secondary pump right cavity port (225), sucking chlorine through that port and associated solenoid valve (123) of Fig. 2 since this solenoid valve (123) is also "open", the chlorine fluid then filling and charging the secondary pump right cavity (235). From that same motion and water cycle as described hereabove, this action also causes the left rod/cylinder (206) along with its left rod/cylinder sleeve (210) to move towards and against the left secondary piston (212) that hereto is fixed and not moving, causing the secondary pump left cavity (237) to collapse and create a chlorine positive pressure in that cavity, this positive pressure also creating a positive displacement to eject that chlorine through the secondary pump right cavity channel (241 ) then trough the secondary pump right cavity port (227), ejecting chlorine through that port by means of positive displacement through its associated solenoid valve (127) of Fig. 2 since this solenoid valve (127) is also "open", this chlorine then directed toward the static mixer (133) of Fig. 3 through the tube (131 ) hereto of Fig. 2, here with one chlorine cycle of the present invention (1 ) completed simultaneously with the water cycle.

As the left rod/cylinder (206) reaches the end of its travel, it energizes the left proximity sensor (147) of Fig. 1 that sends a signal to the PLC that then energizes all solenoid valves (111 , 115, 123, 127) of Fig. 2, all these solenoid valves (111 , 115,

123, 127) closing so way one ("1 ") becomes close and way two ("2") opens to redirect all flow for an opposite positive displacement circulation and flow, and at this point the cycle described hereabove will reverse, with water pressure coming from the now "closed" solenoid valve (111 ) of Fig. 2 that enters the primary pump left cavity port (223) leading into the primary pump left cavity (233), this water pressure increasing and pushing against the primary pump piston (229) and causes the primary pump left cavity (233) to expand as the primary piston (229) wants to move in such way that it also collapses the primary pump right cavity (231 ) and as the water in the primary pump right cavity (231 ) exits this cavity through the primary pump right cavity port (221 ) since its associated solenoid valve (115) of Fig. 2 is now also "closed", this water then directed toward the static mixer (133) of Fig. 3 through the tube (119) hereto of Fig. 2, here with the second water cycle of the present system completed.

From that same opposite motion and reverse water cycle as described hereabove, this action causes the right rod/cylinder (205) along with its right rod/cylinder sleeve (209), and the left rod/cylinder (206) and its left rod/cylinder sleeve (210) to move in the same opposite direction of the primary pump piston (229), causing the secondary pump left cavity (237) to expand as the left secondary piston (212) is also fixed and not moving, this now creating a suction or vacuum effect in the secondary pump left cavity (237), this vacuum transferred in the secondary pump left cavity channel (241 ) and in the secondary pump left cavity port (227), sucking chlorine through that port and associated solenoid valve (123) of Fig. 2, this solenoid valve (123) now "closed" to its way one ("1 ") and open to its way two

("2"), the chlorine fluid then filling and charging the secondary pump left cavity (237).

From that same opposite motion and reverse water cycle as described hereabove, this action also hereto causes the right rod/cylinder (205) along with its left rod/cylinder sleeve (209) to move towards and against the right secondary piston (211 ), causing the secondary pump right cavity (235) to collapse and create a chlorine positive pressure in that cavity, this positive pressure also creating a positive displacement to eject that chlorine through the secondary pump right cavity channel (239) then trough the secondary pump right cavity port (225), ejecting chlorine through that port by means of positive displacement through its associated solenoid valve (127) of Fig. 2, this solenoid valve (127) way one ("1 ") now "closed" and way two ("2") open, this chlorine then directed toward the static mixer (133) of Fig. 3 through the tube (131 ) hereto of Fig. 2, here with the second chlorine cycle of the present system completed simultaneously with the water cycle. As the right rod/cylinder (205) reaches the end of its travel, it energizes the left proximity sensor (146), and which in turns sends a signal to the PLC that then deenergizes all solenoid valves (111 , 115, 123, 127) of Fig. 2, all these solenoid valves (111 , 115, 123, 127) now becoming normally "open" so way one ("1 ") becomes "open" and way two ("2") "closes" to redirect all flow to its original direction as the process starts over again with water pressure coming from the now "open" solenoid valve (111 ) of Fig. 2 that enters the primary pump right cavity port (221 ) leading into the primary pump right cavity (231 ), this water pressure increasing and pushing against the primary pump piston (229) and causing the primary pump right cavity (231 ) to expand as the primary piston (229) wants to move in such way that it also collapses the primary pump left cavity (233) and as the water in the primary pump left cavity (233) exits this cavity through the primary pump left cavity port (223) and associated solenoid valve (115) of Fig. 2 now "open", this water then directed toward the static mixer (133) of Fig. 2 through the tube (119) hereto of Fig. 2 and so on to cycle between one direction to the other in a reciprocating positive displacement motion and pumping effect of the present pump assembly (1 ).

Still referring to Fig. 4, a person skilled in the art can appreciate the pump assembly(ies) (1 ) being either one pump assembly in the form of four (4) independent pumps working simultaneously as one pump assembly (1 ), or two separate pumps in the form of cavities (231 , 233) forming one reciprocating positive displacement pump, and cavities (235, 237) forming another reciprocating positive displacement pump, this combination and configuration permitted by the present system, or in the form of four (4) independent positive displacement pulsating pumps if cavities (231 , 233, 235, 241 ) are configured and used separately, another possibility provided by the present system. Now referring to Fig. 5, which is an enlarged view of half the pump assembly(ies) (1 ) of the present system, this figure's intended purpose is to describe a preferred sealing method of the present pump assembly(ies) (1 ), but not limited to, and that what is shown on Fig. 5 here reflects a mirror view of the opposite side of this pump assembly(ies) (1 ), for Fig. 5 can be considered a suggestion to any expert in the art of hydraulics, and in which Fig. 5 illustrates pressure seals (249) in the forms of "U" cup seals so water cannot leak between the primary pump piston (229) and the primary pump cylinder (203), these primary pump piston (229) seal (249) being position in a back-to-back position so water from the primary pump right cavity (231 ) cannot transit to the primary pump left cavity (233) and vice versa. "U" cup pressure seal (249) are also used to prevent leakage between the cylinder heads (207) and the right rod/cylinders (205). Another sealing method is shown in Fig. 5 where a wiper seal (247) is used between the cylinder head (207) and the right rod/cylinder (205) so dirt cannot enter the pump assembly(ies) (1 ) and wipe the right rod/cylinder (205) clean of contaminants and dirt, etc.

Still shown in Fig. 5 is also a method of sealing the present pump assembly (1 ), and as a primary pump cylinder O-ring (251 ) is used to seal and prevent leaks between the primary pump cylinder (203) and the cylinder heads (207), but not limited to this method as experts in the art can accomplish differently, and the same method of using O-rings is used when primary pump cylinder shaft O-rings (253) are placed on each side and between the primary pumps piston (229) and each the right rod/cylinder (205) and left rod/cylinder (206) so water cannot transit from the primary pumps right cavity (231 ) to the primary pump left cavity (233) through the primary pump piston (229), but not limited to this method as long as any other methods serve the purpose of the present system in which the primary pumps right cavity (231 ) and the primary pump left cavity (233) must remain completely hermetic and/or leakage proof. Fig. 5 also illustrates a sealing method, but not limited to, a method in which O-rings or quad rings are used to form the secondary pump piston O-rings (245), and of which three secondary pump piston O-rings (245), for example, are placed at each ends of the secondary pump piston (211 ) at one end so as to prevent the chlorine present in the secondary pump right cavity (235) to leak and exit between the right secondary piston (211 ) and the right rod/cylinder sleeve (209). Three other secondary pump piston O-rings (245), for example, are located at the other end of the secondary pump piston (211 ) so as to prevent chlorine present in the secondary pump right cavity channel (239) and the secondary pump right cavity port (225), to leak and exit between the secondary pump piston (211 ) and the right manifold block

(213), these methods described here above also applied to the opposite side of the present pump assembly(ies) (1 ), but not limited to these methods, as can be easily understood by a person skilled in the art. Now referring to Fig. 6, this figure is almost identical of Fig. 4 with the exception that both the right rod/cylinder sleeve (209) and the left rod/cylinder sleeve (210) have been removed from the pump assembly(ies) (200) and replaced by a right secondary pump piston (243) and a left secondary pump piston (244), and for the reason that the pump assembly(ies) (1 ) of Fig. 6 as a different dosage ratio between the water and chlorine pumped and mixed together, an aspect of the present system and specification that a person skilled in the art can observe comparing the secondary pump right cavity (235) and secondary pump left cavity (237) of Fig. 6 being much larger than the secondary pump right cavity (235) and secondary pump left cavity (237) of Fig. 4.

Fig. 6 also illustrates the concept that when altering the volume difference between the primary pump right cavity (231 ) and the secondary pump right cavity (235), one will also alter the dosing ratio of the present invention (1 ) pump assembly(ies) (1 ), a principal that equivalently applies to the opposite side of the pump assembly(ies) (1 ) between the primary pump left cavity (233) and the secondary pump left cavity (237) and while other components of the pump assembly(ies) (1 ) will remain unchanged. A second advantageous aspect of the present pump assembly(ies) (1 ) but not illustrated in any figure, is that it is also possible to have the left side of the pump assembly(ies) (1 ) having a specific but totally different dosage ratio then the other side of the pump assembly(ies) (1 ), and as an example of the present specification, one can quote a primary pump right cavity (231 ) being seven ("7") times larger than the secondary pump right cavity (235) to offer a seven-to-one ("7:1 ") dosage ratio, while the other side of the pump assembly(ies) (200) having a primary pump left cavity (233) thirty-five ("35") times larger the secondary pump left cavity (237) configured using a right rod/cylinder sleeve as shown in Fig. 4, to offer a thirty-five to one ("35:1 ") ratio, both different and independent ratios in the same pump assembly(ies) (1 ).

Further to the above and to complete discussion of Fig. 4, one will understand that altering the primary pump right and left cavity (231 , 233) will not only alter the pump assembly(ies) (1 ) dosage ratio, but will also affect the pump assembly(ies) (1 ) pumping speed under identical water pressure, and for smaller primary pump cavities (231 , 233) being of smaller volumes will create the pump assembly(ies) (1 ) to travel faster from one side to the other, and that having larger primary pump cavities (231 , 233) being of larger volume will create a slower traveling pump assembly(ies) (1 ) under the same water pressure, and even further to this, a pump assembly(ies) (1 ) having its primary pump left cavity (233) of different volume then its primary pump right cavity (231 ), will create a pump assembly(ies) (1 ) having two (2) different travel speeds from one side to the other under the same water pressure. Now referring to Fig. 7 which has the sole purpose to illustrate the pump assembly(ies) (1 ) as described hereabove in Fig. 6 having a different dosage ratio, this figure being almost identical of Fig. 5 with the exception that the right rod/cylinder sleeve (209) has been removed from the pump assembly(ies) (1 ) and replaced by a right secondary pump piston (243), Fig. 7 is used to illustrate a method of sealing the right secondary pump piston (243) hereto using "U" cup pressure seal (249) positioned in a back-to-back configuration, this method also applied to the other side of the pump assembly(ies) (1 ), and when all other sealing methods of the present system remain unchanged.

Fig. 8 illustrates a given possible embodiment of the pump assembly(ies) (1 ) in a side-by-side configuration and in which most of the parts remain the same but configured differently and not limited to this configuration, except for the primary pump cylinder rod (259) that replaces the right and left rod/cylinders (205, 206), the secondary pump cylinder rod (261 ) that hereto replaces both the right and left rod/cylinders (205, 206), the secondary pump cylinder (263) that replaces both the right and left rod/cylinder sleeves (209, 210), and the right and left rod/cylinders (205, 206) in the configuration where the right and left rod/cylinder sleeves (209, 210) are not needed.

Although Fig. 8 illustrates what seems to be a more common reciprocating positive displacement pump in the form of a dual side-by-side pump, this particular configuration of the present pump assembly (1 ) still provides another advantageous feature in a way that this configuration permits the use of an external motion power source in the event water pressure is not available or if two or more fluid types need to be pumped but not are under positive pressure, this external motion power source taking the form of an actuator, electrical and/or mechanical, or another hydraulic cylinder or any devices capable of inducing linear motion to the invention (1 ) actual configuration as shown in Fig. 8, this device being attached to any of the two (2) pump link plates (255) designed for that particularity, but not limited to, and one should note that with this configuration it is still possible to have the pump assembly(ies) (1 ) powered with water pressure or any other fluids under pressure at one side of the pump assembly(ies) (1 ), but not an ideal configuration for such application for inducing motion using one side of the pump assembly(ies) (1 ) under this configuration generates asymmetric trust to the opposite side or secondary pump and to potentially damage the pumps and reduce accuracy, for this Fig. 8 configuration should only be used when an external linear motion power is required, as can be easily understood by a person skilled in the art.

Now referring to Fig. 9, this figure being a complement to Fig. 8 illustrating the differences between Fig. 8 configuration and Fig. 3 and Fig. 4 configuration and in which one can observe the similarities between the two (2) configurations of the pump assembly(ies) (1 ), and note that almost all parts remain the same except for the primary pump cylinder rod (259) that replaces the right and left rod/cylinders (205, 206), the secondary pump cylinder rod (261 ) that hereto replaces both the right and left rod/cylinders (205, 206), the secondary pump cylinder (263) that replaces both the right and left rod/cylinder sleeves (209, 210), and the right and left rod/cylinders (205, 206) in the configuration where the right and left rod/cylinder sleeves (209, 210) are not needed, and the secondary pump piston (265) that here is considered replacing the right and left secondary pistons (211 , 212), and (243, 244) in the configuration hereto where the right and left rod/cylinder sleeves (209, 210) are not needed, for all other components remain the same and have the same function in that specific configuration.

Although Fig. 9 illustrates what seems to be a more common reciprocating positive displacement pump in the form of a dual side by side pump, this particular embodiment still provides a pump assembly(ies) (1 ) being either one pump assembly in the form of four (4) independent pumps working simultaneously as one pump assembly (200), or two separate pumps in the form of cavities (231 , 233) forming one reciprocating positive displacement pump, and cavities (235, 237) forming another reciprocating positive displacement pump, this combination and configuration permitted by the present system, or in the form of four (4) independent positive displacement pulsating pumps if cavities (231 , 233, 235, 241 ) are configured and used separately, another possibility provided by the present pump system.

Referring to Fig. 10, this embodiment also provides electrical and hydraulic schematics to ease comprehension of the present system that illustrate the pump assembly (1 ) in a static mode where the system does not operate, Fig. 10 serving the purpose to position and major components is the system and described their specific functions, and in what figure one can see the hydraulic circuitry beginning with a fluid inlet tube (103) connected to a first solenoid valve (105) that acts as a gate valve allowing or shutting off water supply depending of the PLC signal received. This solenoid valve (105) is then connected to a proportional valve (109), this proportional valve (109), for this example, being a 0 to 10 volts DC regulator valve that will modulate water pressure and flow according the strength of the voltage signal it receives from the programable logic control (PLC), 0 volts indicating no flow and pressure are required and 10 volts signal indicating the pump assembly(ies) (1 ) must provide full flow capacity. The proportional valve (109) is then connected to a two-ways three-positions normally "open" solenoid valve (111 ) directing fluid pressure and flow to either side of the pump assembly(ies) (1 ) it is connected to and depending of the signal it receives from the PLC. Connected to the pump assembly(ies) (1 ) an other two-ways three-positions normally "open" solenoid valve (115) that acts to relieve water pressure from the opposite side to the water pressure entrance. Connected to the solenoid valve (115) is a flowmeter (145) and which is then connected to the static mixer (133) which acts to mix any type of fluid passing through. Still referring to Fig. 10, and to describe the chlorine circuit, or secondary circuit that begins with a fluid tube (121 ) connected to the chlorine reservoir or reservoir of any other chemical fluid, and another other two-ways three-positions normally "open" solenoid valve (123) which directs chlorine to one side of the pump assembly(ies) (1 ) or the other side depending in what cycle the pump assembly(ies) (1 ) is and depending of the electrical signal received from the PLC. Connected to the secondary pump of the pump assembly(ies) (1 ), is another two-ways three-positions normally open solenoid valve (127) that acts to relieve chlorine or any other chemical fluid used, from the opposite side to the chlorine inlet, then, connected to the solenoid valve (127) is the static mixer (133) acting to mix any types of fluids passing through.

Fig. 10 also illustrates the pump assembly(ies) (1 ) and right rod/cylinder (205) and the left rod/cylinder (206), along with the two ("2") right and left proximity sensors (146, 147), and more specifically that one can observe with Fig. 10, the left rod/cylinder (206) being located just under the left proximity sensor (147), and which illustrate the pump assembly(ies) (1 ) having travelled to the outmost left position and where the left proximity sensor (147) being a metal detector sensor, will detect the left rod/cylinder (206) to send a signal to the PLC so the PLC knows the actual position of pump assembly(ies) through these right and left proximity sensors (146, 147) and generate signals accordingly, a process more apparent in the following Fig. 11 and 12.

Now referring to Fig. 11 , this figure illustrates the pumping process of the pump assembly(ies) (1 ) traveling in a right-to-left direction and for which one can observe arrows indicating both the water and chlorine flow paths, beginning with water pressure coming from water inlet (103) up to solenoid valve (105). Once the pump assembly is put to operation, the solenoid valve (105) opens to allow water to flow to the proportional valve (109). The proportional valve (109) regulates the water pressure depending of the signal the proportional valve (109) will receive from the PLC, which in turns reads the flowmeter (145) reading the actual flow and regulate the proportional valve (109) to obtain proper flow at the flowmeter (145) in respect of the flow setpoint established by the user. The more flow is required, the more the PLC will open the proportional valve (109), and the less flow is required, and the PLC will reduce water flow in closing the proportional valve (109), and as the PLC continuously compares the flowmeter reading with the user setpoint and adjust the proportional valve (109) accordingly. As the proportional valve (109) receives a voltage signal to "open", the proportional valve (109) lets water flow and pressure travel to the normally open solenoid valve (111 ), then water pressure and flow enters the right-hand side of the pump assembly(ies) (1 ), inducing the pump assembly(ies) (1 ) in motion toward the left-hand side of the pump assembly(ies) (1 ). The water already in the opposite cavity of the pump assembly(ies) (1 ) is then ejected from the pump assembly(ies) (1 ) and flowing through the normally "open" solenoid valve (115) and out solenoid valve (115) connected to the flowmeter (145), then the water flows out the flowmeter (145) toward a static mixer (133), and this is the point this specification will now discuss the chlorine circuit before going any further through the static mixer (133). Still referring to Fig. 11 , this specification will now describe the chlorine or chemical product hydraulic circuit which begins with a fluid tube (121 ) to which a chlorine or any chemical products reservoir is connected. As the pump assembly(ies) (1 ) travels towards the left hand side of the invention (1 ), the pump assembly(ies) (1 ) also creates a vacuum inside fluid tube (121 ) that sucks the chlorine out its reservoir and through fluid tube (121 ) toward solenoid valve (123) which directs chlorine to the right-hand side of the pump assembly(ies) (1 ) by means of suction and charge the pump assembly(ies) (1 ) right-hand side with chlorine. As the pump assembly(ies) (1 ) move(s) toward the left-hand side and charge(s) the right-hand side of the pump assembly(ies) (1 ) with chlorine, the chlorine in the opposite left hand side of the pump assembly(ies) (1 ) is then ejected from the pump assembly(ies) (1 ) through the solenoid valve (127) and toward the static mixer (133). At this point, both water and chlorine are now present in the static mixer (133) which like mentioned earlier, serves to mix water and chlorine together, then the water/chlorine mixture is then ejected through the fluid tube (135) toward the user's device or use, this first hydraulic operation process and fluids dynamic and direction now complete once the left rod/cylinder (206) reaches the left proximity sensor (147) so it sends a signal to the PLC to initiate the next sequence illustrated in Fig. 12 hereafter.

Now referring to Fig. 12, and as the left rod/cylinder (206) of the pump assembly(ies) (1 ) reaches the left proximity sensor (147), the proximity sensor (147) sends an electrical signal to the PLC that then energizes solenoid valves (111 , 115, 123, 127) that simultaneously "close" one port to "open" the other port. At this point, solenoid valve (111 ) redirects water pressure still present and supplied by the proportional valve (109), and pressurizes the left-hand side of the pump assembly(ies) (1 ) so now the pump (1 ) cycles towards the right-hand side. As solenoid valve (115) has also switch ports, water from the right-hand side of the pump assembly(ies) (1 ) can now exit the pump assembly(ies) (1 ) right-hand side cavity by flowing through the solenoid valve (115) and then towards and through the flowmeter (145), then through the static mixer (133) and outlet tube (135).

Still referring to Fig. 12 and as identical as explained hereabove for the chlorine circuit, but for the opposite side, solenoid valve (123) hereto has changed position taking chlorine still present and supplied by tube (121 ), but now redirects the chlorine flow through the solenoid valve (127) that hereto has changed position so chlorine coming out of the left-hand side cavity previously filled, is now being ejected through the solenoid valve (127) then through the static mixer (133), and hereto at this point, then the water/chlorine mixture is then ejected through the fluid tube (135) toward the user's device or use, this second hydraulic operation process and fluids dynamic and direction now complete once the right rod/cylinder (205) reaches the right proximity sensor (146) so it sends a signal to the PLC it reverses once more the pump assembly(ies) (1 ) by simultaneously opening solenoid valves (111 , 115, 123, 127) and so on into continuous right-to-left and left-to-right pumping, dosing and/or mixing cycles and until the pump assembly(ies) (1 ) is put to a full stop by closing the solenoid valve (105) so water pressure and flow is interrupted by user's request through the PLC. Further to the above-detailed description and figures are aspects of the present system that need to be understood for proper comprehension of the present system, such as, although the present specification details a system that is controlled by an "automated" controller, it is to be understood that the same invention purpose can be accomplished using analog controls, electrical relays and switches, although not advantageous.

Moreover, although the present invention details a system that operates using a fluid pressure such as water pressure to provide linear motion power, it is to be understood that the same result can be accomplished using electromechanical actuators, pneumatic actuators and/or other motion driver devices to provide motion power to the pump assembly(ies) (1 ).

Furthermore, although the present description discusses the use of "solenoid" valves to control, direct and distribute fluids of the present pump assembly(ies) (1 ), one must understand that the same purpose and operation can be accomplished using diaphragm, pneumatic and/or mechanical valves, etc.

It is also to be understood that although fabrication materials have not been detailed in the above-mentioned description, materials such as steel, composite materials and plastic materials can be used to fabricate the present system, however, anti-corrosive such as stainless steel are preferred but not limited thereto.

It is also to be understood that although the present specification details the present system as a possible "dosing" and "mixing" device, it is to be also understood that the present system can be used as a reciprocating positive displacement pump that can either be used as a pump, as a fluid dosing device and/or as a fluid pumping device, independently or all together. Furthermore, although the present description used fluids such as "water" and

"chlorine" to facilitate understanding of the present system, it is to be understood that the present invention can pump, dose and/or mix any other fluid(s), as long as the sealing system inside the present invention (1 ) pump assembly(ies) (1 ) or the fabrication materials are compatible with such fluids, etc.

Moreover, and although expressed in the present description hereinabove, one must understand that although the present specification details a pump system that act as a single pumping, dosing and/or mixing system, it should also understand that the present system can also be two (2) reciprocating positive displacement pumps in one embodiment or four (4) totally independent positive pulsating pumps capable of pumping different fluid types independently.

Additionally, and although the present description details a dosing pump capable of various dosing ratios such as 35:1 , 4:1 and 7:1 like described hereabove as way of examples only, one should understand that the present system can be configured to dose fluid in as many ratios as wanted as long as it is mechanically fabricated and physically sized for such ratios. The present pump system and corresponding parts are preferably made of substantially rigid materials, such as metallic materials, hardened polymers, composite materials, polymeric materials (ex. seals, etc.), and/or the like, so as to ensure a proper operation thereof depending on the particular applications for which the pumping assembly (1 ) is intended and the different parameters (forces, moments, etc.) in cause, as apparent to a person skilled in the art.

As may now be appreciated, the present invention is a substantial improvement over other pump assemblies of the prior art used for dosing, mixing and/or metering, in that, by virtue of its design and components, as briefly explained herein, the present pump assembly (1 ) (and/or system), due to its innovative design, enables to overcome or at least minimize some of the known drawbacks associated with conventional systems, providing for a simpler, easier, faster, more accurate, more effective, more functional, more reliable, more economical, more environmental-friendly (due to little or no waste of fluid components, etc.) and/or more versatile manner, than what is possible with other conventional systems.

Indeed, and for example, the present system is advantageous in that it is capable of providing a dosing, metering and/or mixing pump in the form and embodiment of two positive displacement reciprocating pumps, these two pumps including two cavities each and mechanically working together and pumping fluid by reciprocate positive displacement.

The present system is also advantageous in that it is capable of providing a metering and/or dosing pump, having one of the pumps being of smaller volume compared to the other pump, the difference in volume between each pump in respect to a desired mixing volume ratio between the two pumps. The present system is also advantageous in that it is capable of providing a metering and/or dosing pump that can meter, dose and mix any type of liquid(s) constantly through time, this meaning that it will not "pulsate" its flow through a given time frame, but constantly and steadily deliver dosage and mixes, even under the smallest flow requirement and through any given time.

The present system is also advantageous in that it is capable of providing a metering and/or dosing pump not having to rely on any mechanical sources such as electric motors, actuators and/or solenoids to execute pumping, but can use one of the media's pressure to actuate and accomplish pumping of both fluids, and as it can use tap water pressure, for example, to power and actuate itself and pump.

Of course, and as can be easily understood by a person skilled in the art, the scope of the claims should not be limited by the possible embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.

Furthermore, although preferred embodiments of the present invention have been briefly described herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these embodiments and that various changes and modifications could be made without departing form the scope and spirit of the present invention, as defined in the appended claims and as apparent to a person skilled in the art.