| US3785163A | 1974-01-15 | |||
| US3935713A | 1976-02-03 | |||
| US3996765A | 1976-12-14 | |||
| US3916947A | 1975-11-04 |
| 1. | In a closed refrigerant type system including a comdenser, an evaporator coil and a high pressure liquid refrigerant line between the condenser and the evaporator coil through which compressible evaporative refrigerant flows between the condenser and the evaporator coil, the improvement of enhancing the servicing of the refrigerant system comprising: a double valve manifold subsystem installed in the high pressure line between the condenser and the evaporator coil and having a first manually operated shutoff valve (1/26) , with open and closed dispositions, a second manually operated shutoff valve (2/27) , with open and closed dispositions, a bypass passageway (3, 28/29/9) , including a proximal end and a distal end portion, extending be¬ tween and interconnecting said first and said second manually operated valves, with said proximal end con¬ nected to said first valves, and said second valve connected to said distal end portion of said passageway, and a port (5, 31) connected to said distal end portion of said passageway, further downstream than said second manually operated valve, allowing all of the refrigerant from the condenser to flow through the high pressure line potentially to the evapora¬ tor coil and not through said port when said first valve is in its open disposition and said second valve is in its closed disposition, but causing any refrigerant from the condenser to flow through said bypass passageway out said port into an outside line connected to said port and not through said high pressure line when said first valve is in its closed disposition and said second valve is in its open disposition. |
| 2. | The improvement of Claim 1 wherein neither of said first and second valves nor said port include a Shrader type valve. |
| 3. | The improvement of Claim 1 wherein said valves and said port each have an internal backside, and wherein there is further included: a basic manifold body with an internal bore (3) , with said first and second valves and said port extending out from said basic manifold body, with the internal back¬ sides of said valves in communication with said bore and with the internal side of said port being in communication with said bore when said second valve is open, and with said bore forming at least in part said passageway. |
| 4. | The improvement of Claim 3, wherein said basic body has inner and outer sides, and wherein there is further included: an inlet stub (8) and an outer stub (4) extending out from said basic body past said inner and said outer sides, respectively, with said inlet stub connected in line with an upstream end of said high pressure line and said outlet stub connected to a downstream end of said high pressure line, said outlet stub being connected to said passageway through said first valve and being in communica¬ tion with it when said first valve is opened, interconnect¬ ing the upstream and the downstream ends of said high pressure line. |
| 5. | The improvement of Claim 1, wherein at least said second valve and said port have male threaded outer ends, and wherein there is further included: a set of at least three, female threaded caps, with each one being threadingly engageable with a respec¬ tive one of said male threaded outer ends, closing its respective end off. |
| 6. | The improvement of Claim 1, wherein said first and said second valves are separated from each other with an interconnecting section of the main line between them (Fig. 5) and said second valve and said port each have an internal backside, and wherein there is further included: a basic manifold body with an internal bore (28) , with said second valve and said port extending out from said basic manifold body, with the internal backside of said second valve in communication with said bore, and with the internal backside of said port being in communication with said bore when said second valve is open, and with said bore and the interconnecting section of the main line in combination forming at least in part said passageway. |
| 7. | A method of enhancing the servicing of a closed refrigerant type system including a condenser, an evapora¬ tor coil, and a high pressure liquid refrigerant line between the condenser and the evaporator coil through which compressible evaporative refrigerant flows between the condenser and evaporator coil, comprising the following step: installing in the high pressure line between the condenser and the evaporator coil a double valve manifold system having a first manually operated shutoff valve (1/26) with open and closed dispositions, a second manually operated shutoff valve (2/27) , with open and closed dispositions, a bypass passageway (3, 28/29/9), in¬ cluding a proximal end and a distal end portion, extending between and interconnecting said first and said second manually operated valves, with said proximal end connected to said first valve, and said second valve connected to said distal end portion of said passageway, and a port (5, 31) connected to said distal end portion of said passageway, further down¬ stream than said second manually operated valve, allowing all of the refrigerant from the condenser to flow through the high pressure line potentially to the evapora tor coil and not through said port when said first valve is in its open disposition and said second valve is in its closed disposition, but causing any refrigerant from the condenser to flow through said bypass passageway out said port into an outside line connected to said port and not through said high pressure line when said first valve is in its closed disposition and said second valve is in its open disposition. |
| 8. | The method of Claim 7, wherein there is included the further substep of: incorporating said valves and said port into a basic manifold body with an internal bore (3/Fig. 1) , with said first and said second valves and said port extending out from said basic manifold body, with the internal back¬ side of said valves in communication with said bore and with the internal backside of said port being in communi¬ cation with said bore when said second valve is open, and with said bore forming at least in part said passageway. |
| 9. | The method of Claim 7, wherein there is included the further substeps of: separating said first and said second valves from each other with an interconnecting section of the main line between them (Fig. 5) ; and incorporating said second valve and said port into a basic manifold body with an internal bore (28) , with said second valve and said port extending out from said basic manifold body, with the internal backside of said second valve in communication with said bore, and with the internal backside of said port being in communication with said bore when said second valve is open, and with said bore and the interconnecting section of the main line in combination forming at least in part said passageway. |
| 10. | A device containing a double valve manifold with a bypass of the shutoff valve in the main flow refriger¬ ant line between the condenser and evaporator coils of a closed refrigeration system, comprising: a longitudinal main flow manifold containing a manually operated shutoff valve through which compressible evaporative refrigerants flow between the condenser and evaporator coils of a closed refrigeration system and having an en trance and exit to a passageway for the flow of said refrigerant through the said manifold; and further comprising, a second longitudinal manifold containing a manually operated shutoff valve that is gener ally parallel to the said firstly described main flow manifold and shutoff valve with an exter¬ nal threaded access port thereon, without a Schrader valve core therein, extending from said second longitudinal manifold, and a transverse tubular manifold between the first and secondly described lon¬ gitudinal manifold valves, on a gener¬ ally ninety degree angle, which inter¬ sects the first and secondly described manifold valves on the upstream side of the seat thereof, which provides a means to infuse in and to extract refrigerants from a closed refrigeration system through the threaded access port of the sec¬ ondly described manifold, and then through the tubular transverse mani¬ fold, intersecting the first and sec¬ ondly described manifolds, into the firstly described manifold, upstream of the seat of its shutoff valve, allowing a bypass of the main flow shutoff valve. |
| 11. | In a refrigerant system having a condenser and evaporator coils operating in a generally closed refrigera¬ tion system and having a main flow refrigerant line for transferring refrigerant between the condenser and the evaporator coils, the improvement comprising: a bypass valve subsystem included inline between the condenser and the evaporator coils, compris¬ ing two, independent, valve manifolds serving as a bypass of the main shutoff valve, including a first, longitudinal, highpressure refrigerant line manifold containing a first, manually operated shutoff valve having a seat through which compressible evaporative refrigerants can flow between the condenser and evaporator coils of a closed refrigeration system and having an entrance and exit to a passageway for the flow of the refrigerant through it, and a second longitudinal manifold containing a second, manually operated shutoff valve having a seat and being operationally parallel to said first shutoff valve, and further having an access port thereon, without a Schrader valve core therein, extending from said second manifold; and a "T" in the high pressure refrigerant line, said "T" connecting the refrigerant line to said first and second valve manifolds on the upstream sides of the valve seats thereof, providing a means to infuse in and to extract refrigerants from a closed refrigeration system through said access port of said second manifold, and then through the "T", allowing a bypass of the high pressure refrigerant line shutoff valve. |
| 12. | A method of entering, for testing and charging, and exiting a closed refrigeration or air conditioning system having a compressor, a condenser on the high pressure side of the compressor, an evaporator on the low pressure side of the compressor, and a double valve manifold on the refrigerant liquid line connected with a bypass tubular connection on the upstream side of the valve seats thereof, comprising the steps of: a) when entering the system, while the unit is in operation, attach high pressure gauge hose to the access port of the bypass manifold valve, the low pressure gauge hose to the suction port valve, the gauge manifold adapter hose to the refrigerant source and the second adapter hose to the vacuum tank, and, with liquid line shut off valve in open position, open the charging port valve to read the high side pressure of the system, and b) in exiting the system, with the unit in operation or when it is idle, close the access port valve and, with the drum valve closed, open the high side gauge valve first and then the low side gauge valve to induce the refrigerant back into the low side of the system; then secure, in normal operating position, both charging port valves to a closed position and then "bleed" the gauge hoses into the vacuum tank. |
| 13. | A method of executing a vacuum process of a closed refrigeration or air conditioning system having a compressor, a condenser on the high pressure side of the compressor, an evaporator on the low pressure side of the compressor and a double valve manifold on the refrigerant liquid line connected with a bypass tubular connection thereof on the upstream side of the valve seats, comprising the steps of: a. with the main flow liquid line valve in the normal open position with the unit off and the system minus refrig¬ erant, attach high pressure gauge hose to the access port of the bypass manifold valve, the low pressure gauge hose to the suction port valve, the gauge manifold adapter hose to the refrigerant source drum and the second adapter hose to the vacuum pump, and, with liquid line shutoff valve in open position, open the suction charg¬ ing port valve to read the vacuum, and b. with the liquid line access port valve open and the suction charging port valves opened, vacuum the lines, and c. to vacuum the condensing unit side only, with the charging hose connected to the vacuum pump and the high side manifold gauge hose connected to the liquid line access port bypass valve, 30 close the liquid line shutoff valve and open the charging port valve with the suction line valve closed and then proceed to initiate the vacuum pump operation, and 35 d. to vacuum the evaporator side from the condensing unit valves through the ex¬ pansion valve and evaporator coils to the suction line service valve, close the liquid line main shutoff valve, 40 the liquid line charging port valve and the suction line service valve and open the suction line service valve access port valve and proceed to ini¬ tiate the vacuum pump operation 45 through the low side (suction) mani¬ fold gauge hose, and e. to exit the system and return to nor¬ mal operating position, after the unit has been vacuumed, return to normal operating valve positions, i.e., the main flow valve open and the charging port valve closed and, with the re¬ frigerant drum valve closed, connect adapter valve hose to vacuumed tank, open refrigerant drum valve, purge hoses into vacuum tank and then system is ready for recharging. |
| 14. | A method of storing and transferring refrigerants into either the condenser or evaporator sections of a closed refrigerant system having a compressor, a condenser on the high pressure side of the compressor, an evaporator on the low pressure side of the compressor and two indepen¬ dent valves on the refrigerant liquid line connected with a bypass tubular connection thereof on the upstream side of the valve seats thereof by means of a "T", comprising the steps of: a. with the unit in operation, in order to sal¬ vage the refrigerant in the system, when repairing or replacing the condensing unit section of a system, attaching gauges to respective high, low and refrigerant drum connections, and, after purging the hoses into the vacuum tank, closing the refrigerant drum valve and, with the liquid line valve closed, opening the liquid charging port shutoff valve and reading the pressure on the manifold high side gauge and the suction line pressure on the suction access port valve, and then closing the suction line service valve and, after transferring the refrigerant into the condensing unit, closing the suction service valve and turning the condensing unit off, and b. in order to transfer the liquid refrigerant from the condenser into the evaporator side of the system, vacuuming the evaporator side of the system through the suction port, with the drum and vacuum tank valves closed, and opening the high side gauge valve, then the low side gauge valve, and allowing the liquid refrigerant to flow through the gauge manifold into the suction line and into the evaporator, and, when the liquid refrigerant has flowed into and filled the evaporator and the liquid and suction lines, closing the manifold gauges and liquid line port valve; c. if the unit is unable to run, in order to store the liquid refrigerant in the evaporator section of the system, using an auxiliary refrigerant pump, or reclaim unit; d. if any refrigerant remains in the condensing unit section, evacuating an empty, refillable refrigerant drum on a vacuum and inducing the remaining refrigerant into the drum, or using a reclaim unit; e. after the repairs and/or replacements are completed, opening the liquid line valve, allowing the refrigerant to migrate back into the condenser from the evaporator; f. when the pressure equalizes on the condenser and evaporator sides of the system, opening the suction service valve, allowing the unit to be operational, and, with the unit running, balancing the refrigerant charge; and g. when the refrigerant is in a system with a compressor "burn out", filtering and passing the entire charge through a reclaiming process. |
| 15. | A method of servicing a closed refrigerant type system including a condenser, an evaporator section, and a high pressure refrigerant line between the condenser and the evaporator section through which compressible evapora tive refrigerant flows between the condenser and evaporator section, comprising the following step: (a) using in the high pressure line between the condenser and the evaporator section a double valve manifold system having a first manually operated shutoff valve (1/26) with open and closed dispositions, a second manually operated shutoff valve (2/27) , with open and closed dispositions, a bypass passageway (3, 28/29/9), in eluding a proximal end and a distal end portion, extending between and interconnecting said first and said second manually operated valves, with said proximal end connected to said first valve, and said second valve connected to said distal end portion of said passageway, and a port (5, 31) connected to said distal end portion of said passageway, further down¬ stream than said second manually operated valve, allowing all of the refrigerant from the condenser to flow through the high pressure line potentially to the evapora¬ tor section and not through said port when said first valve is in its open disposition and said second valve is in its closed disposition, but causing any refrigerant from the condenser to flow through said bypass passageway out said port into an outside line connected to said port and not through said high pressure line when said first valve is in its closed disposition and said second valve is in its open disposition; and (b) connecting a refrigerant hose to either said second valve or to said port, closing off said first valve and, after said hose is connected, opening said first valve, thereby accessing said high pressure line through said bypass passageway to service the refrigerant system. |
| 16. | The method of Claim 15, wherein the refrigerant system further includes a vacuum tank and a suction port valve, and wherein there is further provided a refrigerant source, highside/lowside gauges with associated charging hoses and with a two valve, adapter connection and two associated hoses for the refrigerant source and the vacuum tank; and wherein step "b" includes the following steps: i. while the refrigerant system is in operation, attaching the highside gauge hose to at least one of said port and said second valve; ii. connecting the lowside gauge hose to the suction port valve, the first adapter hose to the refriger¬ ant source, and the second adapter hose to the vacuum tank; and iii. with said first valve open, opening said second valve to read the high side pressure of the refrig¬ erant system. |
| 17. | The method of Claim 16, wherein the refrigerant system is exited by the following steps: i. closing said second valve and the refrigerant source valve; ii. opening the highside gauge valve and the lowside gauge valve, inducing the refrigerant back into the low side of the refrigerant system; iii. closing off the highside valve and then the lowside valve; and iv. then securing said first and second valves in their normal operation dispositions. |
| 18. | The method of Claim 17, wherein there is included after substep "iii" the further substep of bleeding the gauge hoses into the vacuum tank. |
| 19. | The method of Claim 15, wherein there is included the further steps of: i. placing substantially all of the refrigerant fluid in the condenser and then transferring it to the evaporator section of the refrigerant system, allowing service work on either separately from the other. |
| 20. | The method of Claim 15, wherein there is included the further steps of: independently vacuum processing the condenser and the evaporator section. |
| 21. | The method of Claim 15, wherein there is included the further step of: evacuating the refrigerant from the hose between the gauge and said port. |
| 22. | The method of Claim 15, wherein there is further included at least one of the other innovative method steps disclosed in the foregoing specification. |
The present invention relates to a closed refrigera¬ tion system and more particularly to adding or including a by-pass system therefor. In a first, exemplary embodiment the by-pass system includes valved fittings having two capped, threaded stems extending from, for example, two parallel, elongated manifolds intersected by a transverse manifold, typically at a ninety (90°) degree angle, upstream from the liquid shut-off valve and shut-off seat of the main flow valve of the refrigeration system. The present invention also relates to associated methods for servicing, installing, testing or vacuuming the system and/or removing, storing or adding fluid refrigerant to the system.
In the context of this specification the phrases "refrigerating system, " "refrigeration system" or "refrig- erant system," as used herein, relates to the current and future, state-of-the-art systems that use compressible evaporative refrigerants to transfer heat, e. g. , refrigera¬ tors, freezers, chillers and other air conditioning units, including residential, commercial, automotive and other mobile types.
The maintenance of such systems requires that the refrigerant system be tested and additional refrigerant fluid be added thereto if the fluid contained in the system
is below a predetermined pressure. Also, the refrigerant must sometimes be removed from the system in order to effect repairs, and the system must then be recharged.
Installation, maintenance, testing and/or repairs of such pressurized systems and the infusion of additional refrigerant fluids to said systems require that a valve device or means be installed in the system to accomplish such work without the evaporative fluid in the enclosed space escaping from the system in order that the work can be performed in a safe, economical, efficient and environ¬ mentally protective manner.
The present invention, termed the "Hubbell-Double"™ valve, provides a means to accomplish the aforesaid purposes that is simple to install in a refrigerating system and is simple to construct and inexpensive to manufacture.
Background Art
Many refrigeration and air conditioning systems, especially residential and mobile systems, have threaded fittings in which a threaded check valve core is installed to provide access to the system. Such threaded check valves are of the type commonly used in automobile tire valve stems and are often referred to as "Schrader" type (depressing) valve cores. Most have no shut-off valves, thus allowing a loss of refrigerant when connecting or disconnecting charging hoses, which results in unsafe,
wasteful and harmful emissions into the atmosphere (caus¬ ing, e.g., ozone depletion), in addition to unbalanced refrigerant charges in the system which causes the system to be inefficient. Present systems do not allow the independent vacuum process of both the condenser and evaporator section of the system simultaneously.
Other common problems, in the proper maintenance and repair of refrigeration systems, are the means to check the system to determine the location of leaks and the inability to perform repairs or other work on the condenser unit without "blowing the charge", venting the refrigerant charge into the atmosphere or using expensive recov¬ ery/reclaim machinery or approved cylinders.
The prior art contains a number of teachings of servicing tools and/or means to provide access to a closed refrigeration system, e. g. , those disclosed in U.S. Patent No. 3,935,713 issued to John w. Olson (1976), U.S. Patent No. 3,916,947 issued to Paul M. Holmes (1975), U.S. Patent No. 3,785,163 issued to William Wagner (1974), and U.S. Patent Nos. 3,916,641 and 3,996,765 both issued to John w. Mullins (1975) .
The Olson patent discloses an external tool for the removal of Schrader type (depressing) valves. It is not installed in the system and does not have a main flow shut- off valve and it does not contain a by-pass mechanism to gain access to the system.
The device of the Holmes patent has an access port with a Schrader valve, which the preferred embodiment of
this invention eliminates. It does not have a shut-off valve on the access port. The valve access is not upstream of the main shut-off valve and, therefore, a technician cannot isolate the refrigerant upstream of the main shut- off valve to perform a by-pass operation. It also has only one shut-off valve in the refrigerant flow line.
The Wagner patent discloses a refrigerant charging means and method for charging a saturated vapor refrigerant into the low pressure side of a refrigeration or air condi- tioning system. It discloses a portable external device which is not installed in the system, either at the factory or on-site at the location of the unit. It is a method of metering the charge. It does not allow a by-pass operation and does not allow the isolation of the evaporator or condenser sections of the systems in order that the location of leaks may be more easily ascertained.
The Mullins patents disclose a spring and cam shaft to depress a valve core, a Schrader valve, which can be elimi¬ nated in the preferred embodiments of the present inven- tion. The Mullins patents disclose a portable external tool or device which is not an in-the-unit system and which does not have a double valve that allows a by-pass opera¬ tion.
The present invention addresses and solves the above mentioned problems, when used with the prescribed tech¬ niques, and provides other advantages over the present means which will be further discussed below.
General Discussion of Invention
The present invention preferably:
(1) provides a simple, manually-operated, by-pass valve that eliminates the "Schrader" type valve; (2) is installed in the refrigeration unit and/or air conditioning system, thereby eliminating any external- type devices that are portable and prone to be misused or unused, such as in the hands of unscrupulous, "so-called" technicians; (3) prevents the emission of the refrigerant, practically eliminates the loss of refrigerant fluid when entering or exiting the refrigeration system, some of which "gases" typically contain chlorofluorocarbon (CFCs) and hydrochlorofluorocarbons (HCFCs) and which, when allowed to escape into the atmosphere, cause ozone depletion and may injure the technician servicing the system or other persons close-by through inhalation of the refrigerant, "frost bite" or burns caused by the escaping refrigerants;
(4) allows, through the by-pass valve, the refrigeration technician to place all of the refrigerant fluid in the condenser unit, which then can be transferred to the evaporator section of the system, thus allowing the repair or work on either section separately;
(5) also allows an independent vacuum processing of the condenser or the evaporator sections of the system in order to be able to more easily locate leaks in the system; and
(6) allows the evacuation of the refrigerant fluid from the hose between the standard gauge and the manifold access port of the by-pass valve.
The present invention further preferably eliminates "easy access" to a system, thereby forcing a mechanic to enter/exit a system with a manual front seat (by-pass) valve, safely, thereby eliminating potentially dangerous "short cuts," saving the environment and improving energy use and eliminating or at least substantially reducing the waste of refrigerant. The by-pass valve of the invention allows continuous operation of the system while entering and/or exiting the system without a system shut-down.
It is less complicated and less risky than using a pump-down process required with two standard/Schrader type front seat service valves (liquid & suction) . It also eliminates the process tube silver solder joint on the exit of the present front seat valves and, when used on a suction line, it also eliminates the process tube to the compressor. A first exemplary embodiment of the by-pass valve provided in this invention includes a generally rectangular cast body provided with parallel, longitudinal passageways, which are intersected by a third passageway which prefera¬ bly is transverse to the other two, i.e., at a ninety (90°) degree angle to the parallel passageways, upstream of the shut-off seat of the main flow valve, and provides a by¬ pass shut-off service port for communication with the
refrigerant system through a manifold service gauge (high, low and refrigerant drum connections for hoses) . The embodiment also provides a "Schrader" less (non-depressing valve core) shut-off valve with an access port threaded connection for the standard refrigerant hose and a dust cap when closed and not in use.
The main objective of this invention is to provide an improved, safe, efficient and environmentally protective valve device that is installed in the refrigeration system (liquid and suction lines in the condensing unit) as a means to enter or exit the closed system and service the refrigeration system.
The invention and its related system are subject to many possible changes and/or alternatives (an exemplary one of which is shown in Figures 4 & 5) , but such modifications would not alter or defeat the intentions as described or as illustrated in the drawings herein, thereby not limiting or confining same to the details of the preferred or exemplary embodiments shown.
Brief Description of Drawings
For a further understanding of the nature and objects of the present invention, reference should be had to the following detailed description, taken in conjunction with the accompanying drawings, in which like elements are given the same or analogous reference numbers and wherein:
Figure 1 is a perspective view of the first, preferred embodiment of the by-pass valve system of the present invention.
Figure 2 is a plan view, partially cut-away, of the embodiment of Figure 1.
Figures 3, 3A & 3B are plan, side and front views, respectively, of the embodiment of Figure 1.
Figure 4 is a generalized, perspective view of an exemplary refrigeration system with the by-pass valve system of the present invention illustrated in Figures 1 through 3B connected to the high pressure side of the condenser in line with the evaporator coils.
Figure 5 is a side view of an alternative, second, exemplary embodiment of the by-pass valve system of the invention, which is based on an approach of making a by¬ pass connection achieving similar results as that of the embodiment illustrated in Figures 1+, but having two, independent, separated, spaced, valve structures connected in-line through a "T" and which use the same basic operat- ing, by-pass principles as the first embodiment does.
Figure 6 is a side view, partially in cross-section, of the main part of the alternate by-pass valve system of
Figure 5 by itself, taken from the other side of the figure, i.e., rotated by one hundred and eighty (180°) degrees.
Modes for Carrying Out the Invention
- Structural Details of 1st Embodiment (Figs. 1+) - As illustrated in Figures 1-3B, the first embodiment 30 of the by-pass valve system of the invention includes a threaded liquid shut-off valve 1 (which is a simple, manually operated, cut-off valve) and a parallel, charging port, threaded shut-off valve 2, with an internal, by-pass connection tubing or passageway 3 (note Fig. 2) laterally extending between them. As can be seen in Figure 2, the proximal end of the internal passageway 3 is located upstream at the intersection of the tubing and the seat of valve 1, while its distal end portion is connected to the back of the valve 2.
As can be further seen in Figure 2, the core of the liquid shut-off valve 1 includes a valve stem operator 11, a valve seat 12, outlet stub-out 4A, a seat end 13, inlet 8, the access port 5 for hoses, "O" rings 14, and a female Allen end 15. For simplicity sake the internal details of valve 2 are not shown in Figure 2 because they are substan- tially identical to the valve 1.
The by-pass system 30 further includes a threaded access port 5 associated with but downstream from the shut- off valve 2 and a stub-out field connection 4A for the liquid line 4 (see Fig. 4) . The threaded male connection on the access port 5 is provided for connection to a standard type gauge hose used by refrigerant technicians.
Due to the presence of the interconnecting passageway 3, the back side of the liquid shut-off valve 1, the back side of the charge port, shut-off valve 2, the stub-out line 4A and the access port 5 for the valve 2 can all be exposed to the same internal pressure, with the back-sides of the valves 1 and 2 always being exposed to the passage¬ way line 3 and the line 4 and port 5 being exposed to the passageway 3 when its respective valve 1,2 is open. However, when the valve 1,2 are closed , the line 4 and port 5, each being downstream from its respective valve, are isolated from the passageway 3. Thus, when valve 1 is front seated (i.e. closed), the refrigerant fluid cannot exit valve 1 at the field connection 4A but will be allowed a passageway to the by-pass connection tubing 3. Thus, the valves 1,2, port 5 and the stub-outs 4 and 8 all extend out from the basic main body of the manifold 30, past its inner and outer sides, all through their internal back-ends in direct or indirect communication with the internal passageway bore 3. Further included in the by-pass valve 30 are valve caps 10 & 6 for shut-off valves 1 & 2, respectively, and a dust cap 7 for access port 5, all for use when the valves and access port are not being used. An inlet connection 8 (stub-out) is provided for connection to the upstream high pressure liquid line 9, which goes to the high side of the compressor unit 20, note Fig. 4) . The connection between the inlet stub-out connection 8 to the line 9, as well as
-li¬ the outlet stub-out connection 4A to the downstream liquid line 4, can be made by a flange, compression or flare fitting or, as illustrated, by silver solder.
As can be seen in the exemplary application of Figure 4, which includes an exemplary refrigerant system in the form of a standard type air conditioning system, the double valve by-pass device 30 of Figure 1 is connected through inlet stub-out 8 into the liquid flow line 9 to the condenser. This allows the compressed liquid or refriger- ant to enter the valve 1 when it is back seated, and exit through stub-out line 4A, which serves as the field connection for the liquid line to the evaporator 22.
As can be further seen in Figure 4, other standard components of the refrigeration system include the condens- er 20, the downstream liquid line 4 to the evaporator expansion valve 21, the evaporator coil 22, a suction line 23 exiting the evaporator and connecting to the condensing unit at a suction shut-off valve 24, a suction line access port 25 and a suction line return 10 to the compressor. Suction shut-off valve 24 can be, for example, any standard back seat valve, but preferably one without a "Schrader" fitting.
When the shut-off valve 1 is back seated (open) , refrigerant fluid in line 9 can enter valve 1 at stub-out 8 and exit at stub-out outlet 4A into downstream line 4. When the dust cap 7 is removed and a charging hose is connected to access port 5, and the valve 2 (normally front
εeated and closed) is back seated (opened) and the valve 1 is front seated (closed) , access to the refrigeration line is obtained. The system can then be charged with refriger¬ ant liquid into the high side while the condenser is under a vacuum and the unit is in an "off" position. In this mode the pressure can be tested or other procedures, as explained below, can be performed.
- Structural Details of "In-Line" Embodiment (Figs. 5+) - The two embodiments of Figs. 1+ and Figs. 5+ are functionally very similar, using the same or very similar operational features. Thus, it is noted that, in the alternate embodiment of Figures 5 & 6, valves 26 and 27 functionally correspond to valves 1 and 2 of Figure 1, while manifold 28 intersecting the liquid line 9 with a "tee" (T) at flow-through section 29 and that part of line 9 between section 9 and valve 21 functionally corresponds to the transverse manifold or passageway 3 of Figure 2. Additionally, threaded access port 31 for valve 27 corre- sponds to access port 5 for valve 1 in Figures 1+. The other elements of the refrigerant system, namely elements 20-25 of Figure 4, can be the same.
As can be seen in Figure 5, the first valve manifold 27/28/31 and the second valve manifold 26 are connected in the upstream refrigerant liquid line 9 in line with each other, with the valve manifold 26 then exiting into the downstream liquid line 4. This second embodiment uses the
two independent valves 27 & 26 connected by the "tee" (T) 28/29 to the upstream, adjacent portion of the refrigerant liquid line 9 to form the by-pass between the two valves on the refrigerant liquid line 9. The downstream valve 26 is typically already installed in standard condenser designs and typically will have a side port 26A, which is unused after the manifold 27/28/31 of the invention has been installed. The unused port 26A should be tagged or otherwise marked "not to be used" for future servicing. As can be seen in Figure 5, a supple¬ mental valve 32 can be added as a retro-fit in the line 4 to perform certain additional servicing functions, as detailed below.
It is noted that the alternate approach of Figs. 5 & 6 probably would be more expensive to manufacture and install than the single unit of Figure 1+, when considered as retro-fitted units. The first embodiment was primarily designed to be included during the manufacturing of the compressor unit, for example, the compressor unit 20, rather than as a retro-fit system, while the second embodiment is primarily designed for a retro-fit situation.
- Operation -
Referring now to various, exemplary operations which can be performed by the use of the "in-line by-pass valve" or with the set-up of connecting valves as depicted in
Figure 5, and the methodology of the invention, five exemplary operations will described in detail, namely:
A. Entering system for testing and/or charging and exiting the system;
B. An "in-line valve" vacuum process;
C. Storage and transfer of refrigerants; D. Temporary valve downstream to perform method
"C"; and
E. Transfer and store the refrigerant by a line tap valve.
A . Entering System for Testing and/or Charging and Exiting the System.
The technician will need, in order to perform this operation, the following tools and accessories — standard refrigeration high side/low side gauges with charging hoses, and Allen socket drives with rachet wrench and refrigerant drum. The manifold high/low gauges should include an adapter with a two valve connection for refrig¬ erant drum and vacuum tank hoses, vacuum tank (D.O.T. cylinder) . with the unit in operation, the high pressure gauge hoses are attached to the access port 31, or charging port valve 28 of the "in-line valve" liquid line valve. The low pressure gauge hose is connected to the suction port valve 24 (see Fig. 4) , and the gauge manifold adapter hose is connected to the refrigerant source or drum valve, and the second adapter hose is connected to the vacuum tank.
With the existing unit liquid line shut-off valve 26 open in its back seated position, the charging port valve
27 back seat is opened to read the high side pressure of the system.
To exit the system, the port shut-off valve 27 is front seated (closed) and the drum valves closed, the high side gauge valve and the low side gauge valve are opened to induce the refrigerant back into the low side of the system. The high side gauge valve is shut off first and then the low side valve is shut off. Then both charging port valves (high and low) are secured in normal operation position by front seating said valves into a closed position. Then the gauge hoses are "bled" into the vacuum tank.
B. The "in-line valve" vacuum process l . Entire System, When the System is Devoid of Refriger- ant
One first should make certain that the valve 26 is in the normal open, or back-seated position.
The technician should then go through the same process of connecting the hoses as on the testing and charging procedure ("A" above), except that the drum hose is attached to the vacuum pump inlet.
The manifold high/low gauges should include an adapter with a two valve connection for refrigerant drum and vacuum tank hoses. Access port valve 27 should then be opened (back seated), and the suction charging port valves 25 opened. The lines should be vacuumed, and, after the process is
completed, the charging hose is attached to the refrigerant drum valve and, with both gauge valves closed, the drum valve is opened to purge the charging hose into the vacuum tank. This allows the refrigerant to be added to the system as a liquid through the liquid line side, with the unit off, or as a vapor through the low side with the unit in operation.
2. Vacuum on Separate High or Low Sides a) High Side Vacuum To pull the vacuum on the condensing unit side only (with the charging hose connected to the vacuum pump) , the liquid line shut-off valve 26 is front seated (closed) and the charging port valve 27 is back seated (open) with the suction line valve 24 (see Fig. 4) closed (front-seated) . b) Low Side Vacuum
To pull the vacuum on the evaporator side from liquid line condensing unit shut off valve 26 through the expan¬ sion valve to the suction line service valve entrance or access port 25, the liquid line shut-off valve 26 is front seated (closed) with the suction line valve 24 in a closed position (front-seated) and the access port valve 25 opened and used to pull a vacuum through. c) To Exit the System and Return to Normal Operating Position After the unit has been vacuumed, charged and tested, the valves should be returned to their normal operation positions, i.e., valve 26 open (back-seated) , and charging port valve 27 & 25 closed (front-seated) . If valve 25 is
on a standard back seat valve, it must be back seated to close it.
With the refrigerant drum valve closed, the liquid line valve 26 is back seated (open) and the liquid line port valve 27 is front seated (closed) . The suction line valve 24 is quarter (1/4) turn off back seat on a standard back seat valve, and the gauge valves are opened (high side first, then suction gauge hose valve to induce the remain¬ ing refrigerant in the hoses into the system) . Then, the suction charging port valve 25 is front seated, or on a standard back seat valve is back seated to the closed position. Then any refrigerant residue is bled into the vacuum tank, and all hoses are disconnected as the process is then complete, if a by-pass valve is being used on the suction line in lieu of a standard back seat valve, then front seat same before bleeding hoses into vacuum tank. C. Storage and Transfer of Refrigerant With the unit in operation, in order to salvage the refrigerant in the system, when repairing or replacing the condensing unit section of a system, the procedure is as follows:
Gauges are attached to respective high, low and refrigerant drum connections, and, after purging the hoses into the vacuum tank, the refrigerant drum valve is closed (front-seated) . with the liquid line valve 26 closed (front-seated) , the liquid charging port shut-off valve 27 is opened (back
seated) on the "in-line valve", and the pressure on the manifold high side gauge is read, while reading the suction pressure on access port 25.
The suction line service valve 24 is closed (front seated) after the pump down of the refrigerant into the condensing unit 20, if it has an "old-time" service valve charging port, or, if the suction valve 24 has a "Schrader type" fitting, the Schrader core is removed. The condens¬ ing unit is shut off after pumping down the refrigerant into the condenser.
The evaporator side of the system is pulled on a vacuum through the suction port (with the Schrader core removed) .
With the drum and vacuum tank valves closed, the high side gauge valve is opened; then the low side gauge valve is opened, allowing the refrigerant to flow through the gauge manifold into the suction line at 25 of line 23 into the evaporator. When the liquid refrigerant has flowed into and filled the evaporator and the liquid and suction lines, the manifold gauges and liquid line port valve 27 are closed (front-seated) .
If possible, the refrigeration unit is run to pump the refrigerant into the evaporator side (through the suction line 23 at access port 25) . If the unit is unable to run, in order to store the liquid refrigerant in the evaporator section of the system,
an auxiliary refrigerant pump, or reclaim/recovery unit can be used.
If any refrigerant remains in the condensing unit section, an empty D.O.T. refrigerant drum can be evacuated on a vacuum and the remaining refrigerant induced into the drum (or a recovery/reclaim unit could be used) .
After the repairs are completed, the liquid line valve 26 is opened, allowing the refrigerant to migrate back into the condenser from the evaporator. when the pressure equalizes on both sides of the system (condenser/evaporator) , the suction service valve 24 must be opened to allow the unit to be operational. With the unit running, the refrigerant charge can be balanced.
When refrigerant is in a system with a compressor "burn out", the entire charge will have to be filtered and passed through a reclaiming process. After filtering, the refrigerant will have to be tested to determine if its properties are still retained in order to reuse same, as per E.P.A. standard regulations. It is noted that with units and/or chillers with two (2) or more compressors/circuits, these extra evaporator sections can be utilized as storage containers in lieu of additional D.O.T. cylinders and with a much shortened time to perform the recovery process. One should, of course, take an oil sample prior to transfer into another evapora¬ tor section.
D. Temporary Valve Downstream to Perform Method "C"
The refrigerant should be stored and transferred when repairing/replacing condensing unit components in the refrigeration circuit and/or installing either the original
"Hubbell-Double"" valve (Figs. 1+) or the "in-line" alternate valve (Fig. 6), i.e., field retro-fitted.
The liquid and/or vapor refrigerant should be removed and/or transferred prior to making repairs or replacements to the condensing unit section and minimize the loss of refrigerant to the "lowest achievable level", as well as, reducing the use of a recovery machine and D.O.T. cylin¬ ders, thus reducing costs in time and materials.
The procedure is as follows:
1. The existing liquid line service valve 26 is shut to a closed position, front seated. 2. The liquid and vapor refrigerant are pumped into the condenser coils.
3. The liquid line 4 is cut downstream of the existing liquid line service valve 26 and upstream of the evaporator section expansion device 21, preferably just outside the condensing unit, for easy access.
4. Then a temporary liquid line shut off valve 32 is installed.
5. A vacuum is pulled on the evaporator section, including the liquid line and suction line to 24 with both valve (Figure 1) and 25 closed, front seated.
6. Then the front seat temporary valve 32 is closed.
7. The existing liquid line valve 26 is opened, which becomes a temporary in-line device and allows refrigerant to flow through port 26a of the Figure 5 type valve while entering the high side open manifold gauge valve through the open low side manifold valve gauge with drum and vacuum adapter hoses in a closed position, thus transferring the liquid refrigerant into the suction line in the opposite direction of normal flow while filling the liquid line 4, evaporator 22 and suction line 23 with the condensed liquid charge. When liquid charge ceases to flow and be trans¬ ferred by vacuum/gravity, both high and low side manifold valves are closed.
8. A refrigerant pump and/or recovery machine is used to condense the remaining vapors into a D.O.T. vacuum tank/cylinder. This residue can be recovered in shop by a reclaim/recovery machine with a storage tank.
9. After the repairs are completed to the condensing unit section 20, a new "Hubbell-Double" Figure 1 liquid line type valve or an "in-line" valve 28 upstream of the existing liquid line valve 26 is installed, the temporary liquid line valve 32 is then removed outside of the condensing unit in line 4 and the same is reconnected.
10. If a "Hubbell-Double" valve of the type of Figure 1 is installed, the existing liquid line valve 26 is also removed.
11. If an "in-line" valve 28 is installed upstream of the existing liquid line service valve 26, only the temporary valve 32 is removed and line 4 reconnected.
12. Then pull the condensing unit section 20 on a vacuum by opening the liquid line valve 27 or the valve 1 of Figure 1 through the access port 31 of an "in-line" valve or through the access port 5 of Figure 1.
13. When the vacuum process is completed, open whichever valve (valve 1 of Figure 1 or valve 26 of Figure 5) was used in the vacuum process, allowing the liquid refrigerant to flow back into the high side of the condens¬ ing unit, until the flow stops and the pressures equalize.
14. Then the refrigeration unit can be run and operated, and fully charged and balanced with refrigerant as needed.
15. The method process is then completed.
E. Transfer and Store the Refrigerant by a Line Tap Valve Another method of operation to transfer and store the refrigerant from the condenser into the evaporator section of a refrigeration/air conditioning system, that is operable but requires some condenser repairs.
This operation comprises the following steps:
1. A temporary line tap valve is installed into the liquid line 8 inside the condensing unit and ahead of, upstream of, the existing liquid line shut-off valve 26.
2. This line tap valve serves as a temporary in-line valve, and the methods of operation are identical to the
above A, B, C methods described above for the "in-line" type of valve (Fig. 6) .
3. After the transfer of the refrigerant into the evaporator and repairs are completed to the upstream side of the existing liquid line shut off valve 26, the tempo¬ rary line tap valve is removed and a retro-fit "in-line" valve 28 (Figure 6) is installed, and the steps of the "in¬ line" methods are followed to return the system back to normal operation.
It is noted that the embodiments described herein in detail for exemplary purposes are of course subject to many different variations in structure, design, application and methodology. Because many varying and different embodi¬ ments may be made within the scope of the inventive concept(s) herein taught, and because many modifications may be made in the embodiments herein detailed in accor¬ dance with the descriptive requirements of the law, it is to be understood that the details herein are to be inter¬ preted as illustrative and not in a limiting sense.