Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
BISTABLE ANTI-STALL VALVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/186377
Kind Code:
A1
Abstract:
A bistable valve system comprising a valve body (10), a plug (30), pneumatic or mechanical driving means (50) acting on the plug (30) and anti-stall means (Ml, Ml'; M2, M2') acting on the plug (30) to avoid the operative block. The valve body (10) comprises at least one inlet (I) for the working fluid, at least one first and one second outlet (51, 52) for the working fluid and at least one working chamber (33) defining a first axis (X). The plug (30) is slidably inserted into the working chamber (33) to move along the axis (X) between a first and a second stable working position so as to alternatingly and selectively place the inlet (I) and the first or the second outlet (51, 52) in fluid communication. Anti-stall means (Ml, Ml'; M2, M2') comprising at least one first permanent magnet (Ml, Ml') coupled with the plug (30) to integrally slide therewith along the axis (X) and at least one second permanent magnet (M2, M2') arranged in the working chamber (33), mutually facing the first permanent magnet (Ml, Ml'). The latter and the second permanent magnet (M2, M2') have an opposite polarity to generate forces (FI, F2) that are repulsive with respect to each other.

Inventors:
CAPITANIO, Miro (Viale Riviera Berica 39, Vicenza, 36100, IT)
Application Number:
IB2019/052423
Publication Date:
October 03, 2019
Filing Date:
March 26, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CAPITANIO, Miro (Viale Riviera Berica 39, Vicenza, 36100, IT)
International Classes:
F16K31/122; F16K11/065; F16K31/56
Foreign References:
US3203447A1965-08-31
US5222876A1993-06-29
US2811979A1957-11-05
US2960971A1960-11-22
US3202886A1965-08-24
DE1110970B1961-07-13
US5394131A1995-02-28
GB898565A1962-06-14
DE4000071A11991-07-04
Attorney, Agent or Firm:
AUTUORI, Angelo (Via Monte Cengio 32, Vicenza, 36100, IT)
Download PDF:
Claims:
CLAIMS

1. A bistable valve system, comprising:

- a valve body (10) comprising at least one inlet (I) for an working fluid and at least one first and second outlet (51, 52) for the same, said valve body (10) including at least one working chamber (33) defining a first axis (X);

- a plug (30) slidingly inserted into said at least one working chamber (33) to slide along a first longitudinal axis (X) between a first stable working position and a second stable working position so as to alternatingly and selectively place said at least one inlet (I) and said at least one first outlet (51) or said at least one second outlet (52) in communication;

- pneumatic or mechanical driving means (50) acting on said plug (30) to drive the sliding thereof between said first and said second stable working position;

- anti-stall means (Ml, Ml'; M2, M2') acting on said plug (30);

wherein said anti-stall means (Ml, Ml'; M2, M2') comprise at least one first permanent magnet (Ml, Ml') operatively connected with said plug (30) to integrally slide therewith between said first and said second stable working position, said anti-stall means (Ml, Ml', M2, M2') further comprising at least one second permanent magnet (M2, M2') arranged in said at least one working chamber (33) and mutually facing said at least one first permanent magnet (Ml, Ml'), the latter and said at least one second permanent magnet (M2, M2') having opposite polarity to generate forces (FI, F2) repulsive with respect to each other, so as to prevent the operative block of the plug (30) in intermediate position between said first and said second stable working position.

2. Valve system according to claim 1, wherein said plug (30) is susceptible to selectively and alternatingly shut said at least one first outlet (51) or said at least one second outlet (52) to allow the through-flow of the working fluid respectively through said at least one second outlet (52) or said at least one first outlet (51).

3. Valve system according to claims 1 or 2, further comprising at least one actuator element (36) operatively connected with said pneumatic or mechanical driving means (50) and with said plug (30) to cause the sliding of the latter between said first and said second stable working position.

4. Valve system according to the preceding claim, wherein said at least one actuator element (36) is slidably inserted into said at least one working chamber (33) to slide along a second longitudinal axis (C') substantially parallel to said first axis (X).

5. Valve system according to the preceding claim, wherein said first and second axis (X, X') are mutually spaced.

6. Valve system according to one or more of the preceding claims, wherein said valve body (10) comprises first guide means (25') for slidably guiding said plug (30) along said first axis (X) and second guide means (330) for slidably guiding said actuator element (36) along said second axis (C').

7. Valve system according to claim 4, 5 or 6, wherein said at least one actuator element (36) comprises said at least one first permanent magnet (Ml, Ml'), said plug (30) and said actuator element (36) being mutually coupled to slide along the respective first and second axis (X, X') with the same direction.

8. Valve system according to the preceding claim, wherein said at least one second permanent magnet (M2, M2') is fixed to said at least one working chamber (33).

9. Valve system according to the preceding claim, wherein said at least one working chamber (33) has an inner surface (330) facing said at least one actuator element (36), said at least one second permanent magnet (M2, M2') being fixed at said inner surface (330).

10. Valve system according to claim 8 or 9, wherein said at least one permanent magnet (Ml, Ml') and at least one second permanent magnet (M2, M2') are arranged at said second longitudinal axis (C').

11. Valve system according to the preceding claim, wherein said plug (30) comprises or consists of a slider (21) slidable in said at least one working chamber (33) along a first sliding plane (nl) which comprises openings (54, 55) placed in fluid communication with said at least one first and one second outlet (51, 52), said first axis (X) lying on said first sliding plane (nl), said second longitudinal axis (C') being mutually spaced from the latter.

12. Valve system according to the preceding claim, wherein said at least one first permanent magnet and said at least one second permanent magnet (Ml, Ml'; M2, M2') lie on a second plane (p) passing through said first axis (X) and substantially parallel to said first plane (nl).

13. Valve system according to claim 11 or 12, wherein said anti-stall means (Ml, Ml'; M2, M2') comprise at least one pair of first permanent magnets (Ml, M ) and at least one pair of second permanent magnets (M2, M2'), said first permanent magnets (Ml, Ml') being coupled with said actuator element (36), said second permanent magnets (M2, M2') being arranged in said at least one working chamber (33) symmetrically with respect to a symmetry plane (p2) substantially perpendicular to said first plane (nl) passing through said first axis (X).

14. Valve system according to claim 11, 12 or 13, wherein said first and second permanent magnets (Ml, Ml'; M2, M2') respectively lie along a second and a third axis (Z, Z') substantially perpendicular to said first axis (X) and parallel to each other, said second and third axis (Z,Z') intersecting said first axis (X).

15. Valve system according to one or more of the preceding claims, wherein said valve body (10) has at least one peripheral wall (15) which includes at least one first through hole (15'), there being provided for at least one closing cap (13) having an end (13', 13") which includes said at least one second permanent magnet (M2, M2'), said at least one closing cap (13) being removably insertable into said at least one first through hole (15') so that said at least one second permanent magnet (M2, M2') faces said at least one first permanent magnet (Ml, Ml').

16. Valve system according to the preceding claim when dependent on claim 13 or 14, wherein said at least one peripheral wall (15) has at least one pair of first through holes (15', 15") mutually opposite with respect to said symmetry plane (p2), there being provided for at least one pair of closing caps (13) each having a respective end (13', 13") which includes one of said second permanent magnets (M2, M2'), said closing caps (13) being removably insertable into said first through holes (15', 15") so that said second permanent magnets (M2, M2') face said plug (30).

17. Valve system according to one or more of claims 7 to 16, wherein said actuator element (36) has at least one second through hole (34), there being provided for at least one pin (40) having a pair of opposite ends (41, 41'), at least one of the latter comprising said at least one permanent magnet (Ml, M ), said at least one pin (40) being removably slidably insertable into said at least one second through hole (34) so that said at least one permanent magnet (Ml, Ml') mutually faces said at least one second permanent magnet (M2, M2').

18. Valve system according to the preceding claim, wherein said anti-stall means (Ml, Ml'; M2, M2') comprise at least one pair of first permanent magnets (Ml, M ) and at least one pair of second permanent magnets (M2, M2'), each of said opposite ends (41, 4 ) of said at least one pin (40) includes a respective first permanent magnet (Ml, Ml'), the latter lying on opposite sides with respect to said symmetry plane (p2) so as to mutually face said second permanent magnets (M2, M2').

19. Valve system according to claim 17 or 18, wherein said at least one second through hole (34) is obtained in a substantially central position with respect to said actuator element (36), one of said slider (21) and said actuator element (36) comprising at least one male connection element (23'), the other of said slider (21) and said actuator element (36) comprising at least one female connection element (35), that of said male (23') or female (35) connection element belonging to said actuator element (36) being arranged at said at least one second through hole (34).

20. Valve system according to one or more of the preceding claims, wherein said valve body (10) consists of a cover (11) and a base (12), the latter including at least three loading and unloading half chambers (51, 52, 53) for a working fluid (F), said cover(ll) comprising a lower wall (1 ) susceptible to face said base (12), said lower wall (1 ) comprising a third through hole (16), there being provided for a closing element (17) insertable into said third through hole (16) so as to be interposed between said base(12) and said cover (11), said slider (21) being insertable through said third through hole (16), said closing element (17) comprising an end surface defining said first sliding plane (nl) and at least three openings (54, 55, 56) for placing respectively said at least three half-chambers (51, 52, 53) and said working chamber (33) in fluid communication.

21. Valve system according to one or more of the preceding claims, wherein said pin (40) and said closing caps (13) are made of metal so that respectively said first and second permanent magnets (Ml, Ml'; M2, M2') remain naturally coupled therewith without glue or other coupling means.

22. Valve system according to claim 3, 4 or 5, wherein said plug (21) comprises said at least one first permanent magnet (Ml, Ml'), said at least one actuator element (36) comprising said at least one second permanent magnet (M2, M2'), said plug (21) and said at least one actuator element (36) being mutually operatively connected to slide along the respective first and second axis (X, X') with opposite direction.

23. Valve system according to one or more of the preceding claims, wherein said first and second permanent magnets (Ml, Ml'; M2, M2') are natural or artificial magnets.

24. Valve system according to one or more of the preceding claims, wherein said anti-stall means (Ml, Ml'; M2, M2') comprise at least one pair of first permanent magnets (Ml, Ml') and at least one pair of second permanent magnets (M2, M2').

Description:
BISTABLE ANTI-STALL VALVE SYSTEM

DESCRIPTION

Field of the invention

The present invention applies to the technical field of valve systems, and in particular it regards a bistable anti-stall valve system that can be driven mechanically or pneumatically.

State of the Art

It is known that controlling devices characterised by alternating linear motions, for example pumps, oscillators, compressed air reciprocating motors, pistons, pneumatic hammers, vibrators, boosters, requires bistable valve systems suitable to alternatingly and selectively convey the working fluid into the two half-chambers of such devices.

Two main systems for driving such valve systems, pneumatic or mechanical, both acting directly on the movable parts of the valves are known.

A known disadvantage of such types of valve systems lies in the so-called stall or "dead centre" problem, i.e. an operative stall situation in which the valve system blocks, with ensuing stall of the device to which it is connected and thus requires manual intervention.

Permanent magnets arranged along the sliding axis of the movable sealing members, as disclosed in the United States patent application n° US5222876, were used to overcome such drawback.

However, such known problem revealed to be inefficient towards avoiding the aforementioned problem related to stalling or "dead centre".

Summary of the invention

An object of the present invention is to at least partly overcoming the drawbacks illustrated above, by providing a valve system that is highly efficient and functional.

A further object of the invention is to provide a particularly effective valve system, that allows overcoming the drawback related to stalling or so-called "dead centre".

A further object of the invention is to provide valve system has a minimum number of components.

A further object of the invention is to provide a valve system that is small in size.

A further object of the invention is also to provide a valve system that is easy to manufacture and maintain.

These and other objects that will be more apparent hereinafter, are attained by a valve system according to what is described, illustrated and/or claimed herein.

Advantageous embodiments of the invention are defined in the dependent claims.

Brief description of the drawings

Further characteristics and advantages of the invention will be more apparent in light of the detailed description of a preferred but non-exclusive embodiment of valve system 1, illustrated by way of non-limiting example with reference to the attached drawings, wherein:

FIG. 1A is an axonometric view of a first embodiment of the valve system 1;

FIGS. IB, 1C, ID are respectively top, lateral and front views of the embodiment of the valve system 1;

FIG. 2A is a sectional view along a section plane p2 - p2 taken in FIG. IB when the slider 21 is in the first stable working position;

FIG. 2B is a sectional view along a section plane p - p taken in FIG. 2A when the slider 21 is in the first or second stable working position;

FIG. 2C is an enlarged detail of FIG. 2B;

FIG. 2D is a sectional view along a section plane p2 - p2 taken in FIG. IB when the slider 21 is in the second stable working position;

FIG. 2E is an enlarged detail of FIG. 2D;

FIG. 3A is a sectional view along a section plane p2 - p2 taken in FIG. IB when the slider 21 is in the position defining the stall or the so-called 'dead centre';

FIG. 3B is a sectional view along a section plane p - p taken in FIG. 2A when the slider 21 is in the position defining the stall or the so-called 'dead centre';

FIG. 3C is an enlarged detail of FIG. 3B;

FIG. 4 is a sectional view along a section plane ll-ll taken in FIG. 3B;

FIG. 5 is a sectional view along a section plane Ill-Ill taken in FIG. 1C, in which the pins 37, 37' were removed for the sake of simplicity;

FIG. 6 is an axial sectional view of a first embodiment of a double membrane pump PI which comprises a second embodiment of the valve system 1;

FIGS. 7A and 7B are enlarged views of some details of the embodiment of the valve system 1 of FIG. 6 in which the slider element 2 is respectively in the first and in the second stable working position;

FIGS. 8A and 8B are axonometric views of some details of the slider element 2 - actuator element 36 assembly of the embodiment of the valve system 1 of FIG. 6 in which the plug 2 is respectively in the first and in the second working position, with in FIGS. 9A and 9B respective axial sectional views;

FIGS. 10A and 10B are schematic views of the slider element 2 - actuator element 36 assembly of the first embodiment of the valve system 1 of FIG. 6 respectively in the first and in the second stable working position;

FIG. 11 is a schematic view of the slider element 2 - actuator element 36 assembly of the embodiment of the valve system 1 of FIG. 6 in the stall or so-called "dead centre" position;

FIG. 12 is an axonometric view of the slider element 2 of the embodiment of the valve system 1 of FIG. 6; FIG. 13 is an axonometric view of the actuator element 36 of the embodiment of the valve system 1 of FIG. 6;

FIG. 14 is an axial sectional view of a further embodiment of a double membrane pump P2 which includes a third embodiment of the valve system 1;

FIGS. 15A and 15B are enlarged views of some details of the embodiment of the valve system 1 of FIG. 14 in which the slider element 2 is respectively in the first and in the second stable working position;

FIG. 16 is an axonometric view of some details of the embodiment of the valve system 1 of FIG. 14;

FIG. 17 is an axonometric view of some details of the fixed air distributor 2' of the embodiment of the valve system 1 of FIG. 14;

FIG. 18 is an axonometric view of the slider element 2 of the embodiment of the valve system 1 of FIG. 14;

FIG. 19 is an axonometric view of the actuator element 36 of the embodiment of the valve system 1 of FIG. 14;

FIGS. 20A and 20B are axial sectional views of an embodiment of a double piston pump P3 which includes a further embodiment of the valve system 1, in which the slider element 2 is respectively in the first and in the second stable working position.

Detailed description of some preferred embodiments

With reference to the aforementioned figures, herein described are some possible embodiments of the valve system 1.

More in particular, FIGS. 1A to 5 illustrate a first embodiment of the valve system 1, FIGS. 6 to 13 illustrate a second embodiment of the valve system 1 implemented in a double membrane pump PI, FIGS. 14 to 19 illustrate a third embodiment of the valve system 1 illustrated in a double membrane pump P2 and FIGS. 20A and 20B illustrate a fourth embodiment of the valve system 1 illustrated in a double piston pump P3.

The present invention has various parts that are equal or however equal to each other. Unless otherwise specified, such parts that are equal or similar will be indicated with a single reference number, it being intended that the indicated characteristics are common to all equal or similar parts.

Generally, the valve system 1 may be made using nonmagnetic materials, except for some components indicated hereinafter.

The valve system 1 may essentially comprise a valve body 10 with a working chamber 33, in which a plug 30 and an actuator element 36, acting on the latter, may be housed.

More in particular, the plug 30 and the actuator element 36 may be slidably inserted into the working chamber 33 to slide along respective longitudinal axes X and X', mutually spaces and substantially parallel with respect to each other.

To this end, the working chamber 33 may provide for special first and second guide means for guiding the plug 30 and the actuator element 36 along respective longitudinal axes X and X'.

For example, in the embodiment of the valve system 1 of FIGS. 1A - 5, the same geometry of the working chamber 33 may guide the aforementioned sliding, while in the embodiments of the valve system 1 of FIGS. 6 - 20B suitable guide bars or pins may be provided for.

In the embodiments illustrated herein, such valve system 1 may also include pneumatic driving means 50, which may be connected with a compressor in a per se known manner. It is also clear that in a per se known manner the driving means may be of the mechanical type instead of the pneumatic type.

Generally, the driving means 50 may act on the actuator element 36, which may in turn act on the plug 30 to cause the displacement of the latter between a first stable working position, illustrated for example in FIGS. 2A or 7A, and a second stable working position, illustrated for example in FIGS. 2D or 7B.

As better outlined hereinafter, the mode of interaction between the driving means 50, the actuator element 36 and the plug 30 differs depending on the embodiments of the valve system 1.

More in particular, in the illustrated embodiment of the valve system 1 in FIGS. 1A - 5 the driving means 50 act directly on the actuator element 36, which is in turn coupled with the plug 30 so that the movements of the latter along the axes X' and X occur with the same directions.

On the other hand, in the illustrated embodiments of the valve system 1 in FIGS. 6 - 20B the driving means 50 act indirectly on the actuator element 36 by means pf suitable pins and the actuator element 36 in turn interacts with the plug 30 by means of permanent magnets Ml, Ml'; M2, M2' so that the movements of the actuator element 36 and of the plug 30 along the axes X' and X occur with different directions.

Suitably, the valve body 10 may comprise an inlet I for the working fluid and a first and a second outlet 51, 52 for the working fluid. The plug 30 will alternatingly and selectively place the inlet I in fluid communication with the first outlet 51 or with the second outlet 52.

More in particular, the plug 30 may selectively and alternatingly shut the first outlet 51 or the second outlet 52 to allow the through-flow of the working fluid respectively through the second outlet 52 or the first outlet 51.

Advantageously, in the embodiment of the valve system 1 illustrated in FIGS. 1A - 5 the working fluid may be compressed air which is diverted towards the first or the second outlet 51, 52, while the pneumatic driving fluid coming from a different supply line.

On the other hand, in the embodiments of the valve system 1 illustrated in FIGS. 6 - 20B the working fluid may still be compressed air and it may coincide with the driving fluid, while the pumped fluid may be a liquid.

In order to overcome the stall or "dead centre" situation, there may be provided for suitable anti- stall means Ml, Ml'; M2, M2' acting on the plug 30 so as to avoid the operative block of the latter in the intermediate position between the first and the second stable working position, said intermediate position being for example illustrated in FIGS. 3A or 11.

To this end, the anti-stall means may comprise a pair of first permanent magnets Ml, MT and a pair of second permanent magnets M2, M2', interacting with each other.

It is clear that even though hereinafter reference will be made to pairs of permanent magnets the present invention may include at least one first permanent magnet and at least one second permanent magnet without departing from the scope of protection of the attached claims.

Generally, the first permanent magnets Ml, MT may be operatively connected with the plug 30 to slide integrally therewith along the axis X between the first and the second stable working position, while the second permanent magnets M2, M2' may be arranged in the working chamber 33 and mutually face the first permanent magnets Ml, MT.

More in particular, as better outlined hereinafter, in the embodiment of the valve system 1 illustrated in FIGS. 1A - 5 the second permanent magnets M2, M2' may be fixed in the working chamber 33, while in the embodiments of the valve system 1 illustrated in FIGS. 6 - 20B the permanent magnets M2, M2' may be coupled to the slider element 36 to slide integrally therewith along the axis X'.

The first and second permanent magnets Ml, Ml'; M2, M2' may have opposite polarities. In other words, the mutually faced poles may have the same polarity.

Thus, the first and second permanent magnets Ml, MT; M2, M2' may generate forces FI, F2 that are mutually repulsive with respect to each other, so that should the plug 30 stall, it is pushed towards one or the other of the stable working positions.

With specific reference to the embodiment of the valve system 1 illustrated in FIGS. 1A - 5, the valve body 10 may consist of a cover 11 and a base 12, couplable to each other for example by means of screws V (FIG. 1A).

The cover 11 may comprise the inlet I for the working fluid F and at least one first and one second inlet 50', 50" for the pneumatic driving pulses.

The base 12 may include openings 54, 55 for alternatingly and selectively placing inlet I and the outlets 51, 52 positioned in the base 12 in fluid communication.

The outlet 53 connected with an external environment and the relative opening 56 (discharge) may be provided.

In a per se known manner, the outlets 51, 52 may be operatively connected with a device acting by means of alternating linear motions, for example pumps, oscillators, compressed air reciprocating motors, pistons, pneumatic hammers, vibrators, boosters.

Suitably, the outlets 51, 52 may alternatingly and selectively be delivery and discharge channels in cooperation with the outlet 53, as will be described in detail hereinafter. More, when the working fluid flows out from the outlet 51 the plug places the outlets 53 and 52 in fluid communication to allow the discharge of the used working fluid flowing in through the outlet 52, and vice versa when the working fluid flows out from the outlet 52 the plug places the outlets 53 and 51 in fluid communication to allow the discharge of the used working fluid flowing in through the outlet 51.

Preferably, the working chamber 33 may define the axis X' and a shuttle, which may define the actuator element 36, may be sealingly slidably inserted thereinto. More in particular, the latter may slide along the axis X' guided by the internal surface 330 of the working chamber 33, which will define guide means for the actuator element 36.

The latter may divide the working chamber 33 into three working half-chambers 33"', 33', 33" fluidically independent from each other.

The working chambers 33', 33" may be closed at the ends by sealing caps 18, 18', which may include abutment surfaces 14, 14' defining the end-stop of the actuator element 36.

Suitably, the shuttle defining the actuator element 36 may include - at the ends thereof - two pins 37, 37', which are not represented in FIG. 5 for the sake of simplicity.

The shuttle defining the actuator element 36 may have end surfaces 31, 3 suitable to come to mutual contact respectively with the abutment surfaces 14, 14' during the alternating motion thereof.

The shuttle defining the actuator element 36 may also have a through hole 34 in a substantially central position into which a pin 40 arranged along an axis Z perpendicular to the axis X' may be slidably inserted in a removable fashion. This will simplify the assembly and maintenance of the valve system 1.

Furthermore, the axis Z may be susceptible to pass through the centre C of the shuttle defining the actuator element 36. The same axis Z and the axis X may define a plane p.

Advantageously, the pin 40 may slide integrally with the shuttle defining the actuator element 36 along the same axis X'.

Suitably, the pin 40 may include the first permanent magnets Ml, Ml' at the ends 41, 41' thereof.

Advantageously, the pin 40 may be made of metal, so that the magnets Ml, MT are naturally coupled therewith without glue or other coupling means.

As mentioned above, the second permanent magnets M2, M2', mutually arranged adjacent to the first permanent magnets Ml, Ml', may be arranged in the working chamber 33. Preferably, such second permanent magnets M2, M2' may be arranged along an axis Z' lying on the plane p, parallel to the axis Z and passing through the centre of the working chamber 33.

Advantageously, the magnets Ml, Ml', M2, M2' may be natural or artificial magnets, and not electromagnetic.

Preferably, the cover 11 may have a peripheral wall 15 with a pair of through holes 15', 15".

Furthermore, a pair of closing caps 13 each having a respective end 13', 13" having one of the second permanent magnets M2, M2' may be provided for.

Advantageously, the closing caps 13 may be suitable for the removable screwing into the through holes 15', 15" along the axis Z' so that the second permanent magnets M2, M2' face the shuttle 36.

This simplifies the assembly of the valve system 1.

Advantageously, the caps 13 may be made of metal, so that the second magnets M2, M2' are naturally coupled therewith without glue or other coupling means.

Suitably, the magnets of each pair of permanent magnets Ml, Ml', M2, M2' may be mutually symmetrical with respect to a plane p2 substantially perpendicular to the plane nl. The plane p2 may be a symmetry plane for the cover 11 so that the axis X' lies thereon.

Furthermore, the plug 30 may advantageously be defined by a slider 21 slidable along a sliding plane nl, on which the axis X may lie.

The sliding plane nl may comprise openings 54', 55' placed in fluid communication with the openings 54, 55 and with the outlets 51, 52.

It is clear that even though hereinafter reference will exclusively be made to the slider 21, the plug 30 may also comprise or consist of the latter without departing from the scope of protection of the attached claims.

The slider 21 may have a circular or rectangular shape defined by an upper surface 23 with a central portion comprising a male connection element 23' and a lower surface 25 with a portion 25' at mutual contact with the plane nl so as to define a circular or rectangular working chamber 38.

The sliding plane nl and the portion 25' of the slider 21 will define guide means for the sliding of the latter.

Advantageously, the lower surface 25 of the slider 21 and the chamber 38 may face the openings

54, 55, 56.

Preferably, the shuttle defining the actuator element 36 may have a seat or a female connection element 35, for example circular or slot-shaped, into which the male connection element 23' may be inserted.

As particularly illustrated in FIGS. 2A and 5, the connection element 23' of the slider 21 will take a determined position from the position of the slot 35 obtained in the shuttle defining the actuator element

36.

Suitably, the slider 21 may be susceptible to move in the working chamber 33 along the plane nl on which the axis X lies substantially parallel to the plane p on which the axis X' lies and spaced by the anti-stall means Ml, Ml', M2, M2'.

Suitably, the cover 11 may comprise a lower wall 1 susceptible to face the base 12.

In addition, the lower wall 1 may comprise a through hole 16, into which a closing element 17 may be inserted to remain interposed between the base 12 and the cover 11. The closing element 17 may comprise a lapping surface defining the sliding plane nl and the openings 54, 55, 56 for placing the three outlets 51, 52, 53 and the working chamber 33 in fluid communication.

Operatively, as illustrated in FIGS. 2A - 2E, when the shuttle defining the actuator element 36 for example receives a driving pulse from the inlet 50", the end surface 31 thereof will be mutually at contact with the abutment surface 14 of the sealing cap 18. The working fluid F, which flows in through the inlet I, will fill the working chamber 33 and it will be ejected through the opening 55 and the outlet 52. Thus, the inlet I of the valve body 10 will be in fluid communication with the second outlet 52 so as to allow the outflow of the working fluid F.

Simultaneously, the discharge of the used working fluid F coming from the user device sequentially through the outlet 51, the opening 54, the chamber 38, the opening 56 and the outlet 53 will be allowed.

Vice versa, the operation will be mirror-like when the shuttle defining the actuator element 36 will receive a driving pulse from the inlet 50' so that the end surface 3 of the shuttle defining the actuator element 36 is at mutual contact with the abutment surface 14' of the sealing cap 18'.

The working fluid F will fill the working chamber 33 and it will be ejected through the opening 54 and the outlet 51. Thus, the inlet I of the valve body 10 will be in fluid communication with the first outlet 51 thereof to allow the outflow of the working fluid F.

Simultaneously, the discharge of the working fluid F coming from the user device sequentially through the outlet 52, the opening 55, the chamber 38, the opening 56 and the outlet 53 will be allowed.

Suitably, the first pair of magnets Ml, MT will generate a pair of forces FI of equal module and direction opposite to the pair F2 generated by the second pair of magnets M2, M2'.

Advantageously, the forces FI and F2 will be generated on the plane p parallel to the sliding plane nl of the slider 21 or other known valve systems.

This will allow providing different known types of valve systems, for example of the slider type, as described herein, of the sleeve type or of the plug type, in which the plane p and nl can be kept distinct. Thus, there will be obtained a magnetic unbalancing system suitable to overcome the so-called 'dead centre' situation defined by an operative block position.

Given that the forces FI and F2 are mutually repulsive with respect to each other, the latter will keep the translation of the shuttle defining the actuator element 36 quick and controlled.

The valve system 1 illustrated in FIGS. 1A to 5 will have the same operation choosing an actuation of the mechanical type operated by external forces alternatingly acting along the axis X, for example on the pins 37, 37'.

In such case, the driving inlets 50', 50" will serve as discharge for the air volume respectively and alternatingly accumulated in the chambers 33", 33' by the alternating motion of the shuttle defining the actuator element 36.

With reference to the embodiments illustrated in FIGS 6 - 20B, illustrated are pumps PI, P2 of the double membrane type, in particular in FIGS. 6 to 19, or a pump P3 of the double piston type, in particular in FIGS. 20A and 20B.

It is clear that the operation of the pumps PI, P2 and P3 is substantially identical, both as concerns the double membrane pump and the double piston pump. Thus, in the description hereinafter, reference will be made to the membrane pump PI illustrated in FIGS. 6 to 13, it being deemed that the description also applies to the membrane pump P2 illustrated in FIGS. 15 - 19 and the double piston pump P3 illustrated in FIGS. 20A - 20B.

The pump PI may include a support structure 2 with a first half-chamber 200 which includes a first membrane 210, and a second half-chamber 300 which includes a second membrane 310.

In a per se known manner, the support structure 2 of the pump PI may also comprise a third and a fourth half-chamber 400, 500 suitable to house the pumped fluid, in a per se known manner. Furthermore, such third and fourth half-chamber 400, 500 will be connected to an intake circuit S and a delivery circuit D.

The first and the second membrane 210, 310 may be mechanically connected to each other. For example, in the embodiment shown in FIG. la, the two membranes 210, 310 may be connected through an extended rod 600.

In the embodiments of the valve system 1 illustrated in FIGS. 6 to 20B, the valve body 10 may be interposed between the half-chambers 200, 300 to alternatingly and selectively convey to the latter the working fluid coming from a compressor for example.

To this end, a fixed air distributor 2' which will fluidically connect the valve body 10 and the half chambers 200, 300 through selective interaction with the plug 30 may be provided for.

The valve body 10 may include the working chamber 33, which may in turn include the plug 30 and the actuator element 36.

More in particular, the plug 30 may comprise a first slider element 2 with sleeve slidable along the fixed air distributor 2', which will define the axis X between the first and the second stable working position, illustrated for example in FIG. 7A and 7B.

Thus, the slider element 2 with sleeve will alternatingly and selectively place the inlet I of the working chamber 33 in communication with the first or the second half-chamber 200, 300 through the outlets 51, 52.

Thus, when the half-chamber will increase the volume due to the working fluid flowing thereinto, the volume of the other half-chamber will reduce, emptying. The fluid discharged by the emptying half chamber will end up in a fifth half-chamber 5 connected with the external environment and interposed between the first and the second half-chamber 200, 300. In order to allow such operation, the fixed air distributor 2' may include a first duct 3 for placing the working chamber 10 and the first half-chamber 200 in fluid communication and a second duct 4 for placing the working chamber 10 and the second half-chamber 300 in fluid communication.

The actuator element 36 may comprise a second slider element 83 with respective guide bars or pins 81, 81', which may define the axis X'. Simultaneously, the guide bars or pins 81, 81' may selectively come into contact with the respective first or second membrane 210, 310 to define pushing means, as illustrated hereinafter.

Given that the two membranes 210, 310 are connected, as shown in FIG. 6, the displacement of the first membrane 210, due to the increase of the volume thereof, corresponds to the displacement of a second membrane 310 in the same direction.

The second membrane 310 may come into contact with the guide pin or bar 81 for actuating the displacement of the slider element 2 , which will slide along the axis X guided not only by the fixed air distributor 2' but also by the guide bars72, 72' inserted into respective through seats 77, 77'.

The second slider element 83 of the actuator element 36 may be slidably guided along the axis X' not only by the pins 81, 81' but also by the guide bars 84, 84' inserted into respective through seats 88, 88'.

The second slider element 83 may be arranged substantially facing the first slider element 21'.

Suitably, the first and the second slider element 21', 83 may respectively include the first natural permanent magnets Ml, Ml' and the second natural permanent magnets M2, M2', of the same polarity and facing each other.

In a preferred but non-exclusive embodiment, the magnets Ml, Ml'; M2, M2' may be arranged on the first and second slider element 2 , 83 at respective end portions designated to be arranged facing each other when the magnets Ml, Ml'; M2, M2' are in mutual correspondence during their mutual sliding along the axes X, X', for example as illustrated in FIG. 11.

Thus, the magnets Ml, Ml'; M2, M2' will advantageously generate the repulsive forces FI, F2, as outlined above.

The sliding constraint of the first slider element 2 and of the second slider element 83 on the respective guide bars 72, 72'; 84, 84' will allow to eliminate the normal component of the repulsive magnetic force, which will develop solely along the axes X, X' with high intensity, increasing as the magnets Ml, Ml'; M2, M2' approach.

This fully solves the problem relating to the so-called "dead centre", in particular at low speeds or low working pressure.

From a construction point of view, the pump 1 consists of a minimum number of pieces. As a matter of fact, the support structure of the pump 1 may consist of two end covers 90, 91 and a central element which includes the valve system 1. The end cover 90 may include the first half-chamber 200, the third half-chamber 400 and the first membrane 210, while the end cover 910 may respectively include the second half-chamber 300, the fourth half-chamber 500 and the second membrane 310.

In light of the above, it is clear that the invention attains the pre-set objectives.

The invention is susceptible to numerous modifications and variants all falling within the inventive concept outlined in the attached claims. Furthermore, all details can be replaced by other technically equivalent elements, and the materials can be different depending on the needs, without departing from the scope of protection defined by the attached claims.