Capacity control valve for screw compressor and method

Abstract

Example implementations involve a sealing liquid delivery system for a mechanical capacity control device of a screw compressor comprising a mechanical capacity control device including a mechanical capacity control valve movable to vary an amount of gas compressed by die screw compressor; a mechanical capacity control device housing including a cavity configured to receive the mechanical capacity control device, a gap formed between the mechanical capacity control device housing and the mechanical capacity control valve: a pressurized sealing liquid delivery member carried by the mechanical capacity control device housing and configured to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

Description

CAPACITY CONTROL VALVE FOR SCREW COMPRESSOR AND METHODBACKGROUNDField

[0001] The present disclosure is generally related to mechanical capacity' control valves for screw compressors, and more specifically, to rotary spool valves for screw compressors.Related Art

[0002] Continual pressure on energy supplies have focused the compressor industry on efficiency improvement. Supply shortages have created a need to use products that are less complex and are readily available. Rotary spool valve technology facilitates both of these goals. Mechanical capacity control valves exist in the past, but none include a method for supplying sealing liquid to a valve other than sealing liquid that moves to the valve unintentionally such as when the mechanical capacity control valve is located above tire rotor housing.

[0003] The efficiency of screw compressor's equipped with a mechanical capacity control valve is reduced by the amount of gas that leaks out. of the rotor housing and around the capacity control valve. This is especially true when the valve is not located where tire gap between the valve and the rotor housing can be substantially filled by a sealing liquid, such as oil, moved by unintentional forces, such as gravity (e.g., when the valve is located below the rotor housing) or centrifugal force, acting to move tire sealing liquid to the gap. This reduction in efficiency is due to the work wasted by compressing gas that does not contribute to tire capacity' of the system or the hot gas and oil that leak around the valve and enter the inlet and contribute to inlet gas preheat. Many' design tradeoffs can be made to decrease leakage. Some of these include increasing overlap, increasing valve size, decreasing rotor housing window area, decreasing the clearance between the valve and the rotor housing and designing the valve to open more abruptly. All of these either increase cost or decrease functionality.SUMMARY

[0004] An aspect of the disclosure involves a sealing liquid delivery system for a mechanical capacity control device of a screw compressor that improves the efficiency in ascrew compressor without having to make the above-recited design tradeoffs or move the valve to a location such as below the rotor housing where unintentional forces act on the sealing liquid to move it to fill the gap. The sealing liquid delivery system allows the gap between the valve and its housing to be filled with sealing liquid in any location. A supply line for the sealing liquid is fitted to tire valve chamber and a circulation method supplied to move the sealing liquid through the supply line to the valve chamber. The sealing liquid delivery system is beneficial for all screw compressors equipped with a mechanical capacity control device that cannot be located in such a way that it takes advantage of sealing liquid provided by unintentional means of delivering the sealing liquid such as gravity when the mechanical capacity control device is located below the rotor housing or centrifugal force. The mechanical capacity control device may be used instead of a variable speed drive (“VSD") or in combination with VSD to add increased turndown range.

[0005] Another aspect of the disclosure involves a sealing liquid delivery system for a mechanical capacity control device of a screw compressor comprising a mechanical capacity control device including a mechanical capacity control valve movable to vary an amount of gas compressed by the screw compressor; a mechanical capacity control device housing including a cavity configured to receive the mechanical capacity control device, a gap formed between the mechanical capacity control device housing and the mechanical capacity control valve: a pressurized sealing liquid delivery member earned by the mechanical capacity control device housing and configured to supply sealing liquid under pressur e to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

[0006] One or more implementations of the aspect of the disclosure described immediately above includes one or more of the following: the mechanical capacity control valve is a rotary spool valve that rotates to open or close passages that vary the amount of gas compressed by the screw compressor; the mechanical capacity control valve is one of a sliding valve, a poppet valve, and a gate valve designed with a gap between the valve mechanism and its seat to open or close passages that vary the amount of gas compressed by the screw compressor: the sealing liquid delivery system includes the sealing liquid and the sealing liquid is the same as or different from a sealing liquid used in the compressor; the pressurized sealing liquid delivery member includes a sealing liquid control orifice in communication with the cavity of the mechanical capacity control device housing to supply sealing liquid under pressure to the cavityof the mechanical capacity control device housing; the pressurized sealing liquid delivery member includes an internally or externally routed sealing liquid supply line carried by the mechanical capacity control device housing and in communication with the sealing liquid control orifice to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing; the mechanical capacity control device housing includes an intake end and a discharge end, the intake end located closer than the discharge end to a gas outlet of the screw compressor and the discharge end located closer than the intake end to a gas inlet of the screw compressor, the intake end carrying the pressurized sealing liquid delivery member; the mechanical capacity control device is a top-mounted mechanical capacity control device; the mechanical capacity control device is a side-mounted mechanical capacity control device; and / or the mechanical capacity control device is a botom-mounted mechanical capacity control device.

[0007] An additional aspect of the disclosure involves a sealing liquid delivery system tor a mechanical capacity control device of a screw compressor comprising a mechanical capacity control device including means for varying an amount of gas compressed by the screw compressor; means tor receiving the varying means, a gap formed between the receiving means and the varying means; means for supplying sealing liquid under pressure to the receiving means to inhibit leakage through the gap between the receiving means and the varying means,[000S] One or more implementations of the aspect of the disclosure described immediately above includes one or more of the following : the varying means is a rotary spool valve that rotates to open or close passages that vary the amount of gas compressed by the screw compressor; the varying means is one of a sliding valve, a poppet valve, and a gate valve designed with a gap between the valve mechanism and its seat to open or close passages that vary the amount of gas compressed by the screw compressor; the supplying means includes the sealing liquid and the sealing liquid is the same as or different from a sealing liquid used in the compressor; the supplying means includes a sealing liquid control orifice in communication with the receiving means to supply sealing liquid under pressure to the receiving means; the supplying means includes an internally or externally routed sealing liquid supply line carried by the receiving means and in communication with the sealing liquid control orifice to supply sealing liquid under pressure to the receiving means; the receiving means includes an intake end and a discharge end, the intake end located closer than the discharge end to a gas outlet of the screw compressor and the discharge end located closer than the intake end to a gas inlet ofthe screw compressor, the intake end carrying the supplying means; the mechanical capacity control device is a top-mounted mechanical capacity control device; the mechanical capacity' control device is a side-mounted mechanical capacity control device; and / or the mechanical capacity control device is a botom-mounted mechanical capacity control device.

[0009] A further aspect of the disclosure involves a method of using a sealing liquid delivery system, the sealing liquid delivery system comprising a mechanical capacity control device including a mechanical capacity control valve movable to vary an amount of gas compressed by the screw compressor; a mechanical capacity control device housing including a cavity configured to receive the mechanical capacity control device, a gap formed between the mechanical capacity' control device housing and the mechanical capacity control valve; a pressurized sealing liquid delivery member carried by the mechanical capacity control device housing and configured to supply sealing liquid under pressure to the ca vity' of the mechanical capacity' control device housing to inhibit leakage through the gap between tire mechanical capacity' control device housing and the mechanical capacity' control valve, the method comprising: supplying with the pressurized sealing liquid delivery member the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity' control valve.

[0010] One or more implementations of the aspect of the disclosure described immediately above includes one or more of the following: the mechanical capacity control valve is a rotary spool valve that rotates to open or close passages that vary the amount of gas compressed by the screw compressor, and supplying includes supplying the sealing liquid under pressure to tire cavity of the mechanical capacity control device while the rotary spool valve rotates to open or close passages that vary tire amount of gas compressed by the screw compressor; the mechanical capacity control valve is one of a sliding valve, a poppet valve, and a gate valve designed with a gap between the valve mechanism and its seat to open or close passages that vary' the amount of gas compressed by the screw compressor, and supplying includes supplying the sealing liquid under pressure to the cavity of the mechanical capacity control device while one of the sliding valve, the poppet valve, and the gate valve opens or close passages that vary the amount of gas compressed by the screw compressor; the sealing liquid delivery system includes the sealing liquid and the sealing liquid is the same as or different from a sealing liquid used in the compressor, and supplying includes supplying the same sealing liquid as the sealingliquid used in the compressor under pressure to the c;u it y of the mechanical capacity control device or supplying a different sealing liquid than the sealing liquid used in the compressor under pressure to the cavity of the mechanical capacity control device; the pressurized sealing liquid delivery member includes a sealing liquid control orifice in communication with the cavity of the mechanical capacity' control device housing to supply sealing liquid under pressure to the cavity' of the mechanical capacity control device housing, and supplying includes supplying with the sealing liquid control orifice the sealing liquid tinder pressure to the ca vity of the mechanical capacity control device housing to inhibit leakage thr ough the gap between the mechanical capacity control device housing and the mechanical capacity' control valve; the pressurized sealing liquid delivery member includes an internally or externally routed sealing liquid supply line carried by the mechanical capacity control device housing and in communication with the sealing liquid control orifice to supply sealing liquid under pressur e to the cavity of the mechanical capacity control device housing, and supplying includes supplying with the sealing liquid supply line and the sealing liquid control orifice the sealing liquid under pressure to the cavity of the mechanical capacity' control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve; the mechanical capacity' control device housing includes an intake end and a discharge end, the intake end located closer than the discharge end to a gas outlet of the screw compressor and the discharge end located closer than the intake end to a gas inlet of the screw compressor, the intake end carrying the pressurized sealing liquid delivery member, and supplying includes supplying with the pressurized sealing liquid delivery member in the intake end the sealing liquid under pressure to the cavity-' of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity' control device housing and the mechanical capacity' control valve; the mechanical capacity' control device is a top-mounted mechanical capacity' control device, and supplying includes supplying with the pressurized sealing liquid delivery member in the top-mounted mechanical capacity control device the sealing liquid under pressure to the cavity of the mechanical capacity-' control device housing to inhibit leakage through the gap between the mechanical capacity-' control device housing and the mechanical capacity control valve; the mechanical capacity-' control device is a side-mounted mechanical capacity control device, and supplying includes supplying with the pressurized sealing liquid delivery member hi the side-mounted mechanical capacity-' control device the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity' control device housing and the mechanical capacity control valve; and / orthe mechanical capacity control device is a bottom-mounted mechanical capacity control device, and supplying includes supplying with the pressurized sealing liquid delivery member in the bottom-mounted mechanical capacity control device the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity" control valve.BRIEF DESCRIPTION OF DRAWINGS

[0011] A general architecture that implements the various features of the disclosure will now be described with reference to the drawings. Hie drawings and the associated descriptions are provided to illustrate example implementations of the disclosure and not to limit the scope of the disclosure. Throughout the drawings, reference numbers are reused to indicate correspondence between referenced elements.

[0012] FIG. 1 is a cross-sectional view of a prior art mechanical capacity control device located below a rotor housing in a screw compressor whereby gravity causes a sealing liquid to be delivered to and substantially fill the gap between the valve and the rotor housing.

[0013] FIG. 2A is a cross-sectional view of an embodiment of a screw compressor where the mechanical capacity control device is located above a rotor housing; FIG. 2B is an enlarged area of FIG. 2A where sealing liquid is delivered to and substantially fills a gap between the valve and the rotor housing; FIG. 2C is a cross-sectional view of the sealing liquid delivery system of FIG. 2A taken along lines 2C-2C.

[0014] FIG. 3 illustrates another embodiment of a sealing liquid delivery system where the mechanical capacity control device is a side-mounted mechanical capacity control device.

[0015] FIG. 4 is a further embodiment of a sealing liquid delivery system where the mechanical capacity control device is a bottom-momited mechanical capacity control device.DETAILED DESCRIPTION

[0016] The following detailed description provides further details of the figures and example implementations of the present application. Reference numerals and descriptions of redundant elements between figures are omitted for clarity. Terms used throughout the description are provided as examples and are not intended to be limiting. Sequentialterminology, such as “first”, “second”, “third”, etc., may be used in the description and claims simply for labeling purposes and should not be limited to referring to described actions or items occuiring in the described sequence. Actions or items may be ordered into a different sequence or may be performed in parallel or dynamically, without departing from the scope of the present application.

[0017] Example implementations described herein involve a sealing liquid delivery system 100 for a mechanical capacity control device 110 of a screw compressor 120. With reference to FIG. 1, before describing the sealing liquid delivery system 100, a mechanical capacity control device or valve 130 of a screw compressor 140 of the prior art will first be described in order to gain a better understanding of the sealing liquid delivery system 100. As the mechanical capacity control valve 130 is opened, gas is allowed to flow from a window in rotor housing 150, pass through valve chamber 160, out a transfer duct and into an inlet, thereby reducing compressor capacity. When the mechanical capacity control valve 130 is closed, the capacity is increased. Even with the mechanical capacity control valve 130 closed, there is always some leakage through a gap between the mechanical capacity control valve 130 and its mechanical capacity control valve housing 168 that decreases efficiency. If a sealing liquid is introduced into the gap, the efficiency is improved. The mechanical capacity control valve 130 is commonly located below tire rotor housing 150 so that gravity or centrifugal force moves sealing liquid to the gap.

[0018] FIGS. 2A-2C illustrate an embodiment of a screw compressor 120 where a mechanical capacity control device 110 is located above a rotor housing 150 instead of below the rotor housing 150 as shown in FIG. 1, The mechanical capacity control device 110 is a mechanical capacity control valve (e.g., rotary spool valve) 175 movable (e.g., rotatable) to open or close passages that vary an amount of gas compressed by the screw compressor 120. In alternative embodiments, the mechanical capacity control valve 175 is one of a sliding valve, a poppet valve, a gate valve, or other valve device, A mechanical capacity control device housing 180 includes a cavity 190 configured to receive the mechanical capacity control device 110. A gap G is formed between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175. The sealing liquid delivery system 100 includes a pressurized internally or externally routed sealing liquid delivery member or supply line 200 terminating in a sealing liquid control orifice 210 earned by the mechanical capacity control device housing 180 and configured to supply sealing liquid underpressure to the cavity 190 ofthe mechanical capacity control device housing 180 to inhibit leakage through the gap G between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175 even though the mechanical capacity control valve 175 is not in a location that provides unintentional sealing liquid. The mechanical capacity control device housing 180 includes an intake end (e.g., spiral valve cavity intake end) 220 and a discharge end (e.g., spiral valve cavity discharge end) 230, the intake end 220 is located closer than the discharge end 230 to a gas outlet of the screw compressor 120 arid the discharge end 230 is located closer than the in take end 220 to a gas inlet of the screw compressor 120. The intake end 220 carries the pressurized sealing liquid delivery member 200.

[0019] As shown in FIG. 2C, the sealing liquid delivery system 100 may circulate / recirculate the same sealing liquid as the sealing liquid used in the screw compressor 120. Sealing liquid used in the screw compressor 120 near the bottom of the rotor housing 150 may be drawn under pressure through an inlet or orifice 232 to the pressurized sealing liquid delivery supply line 200 for delivery to the sealing liquid control orifice 210, where the sealing liquid is supplied under pressure to the cavity 190 of the mechanical capacity control device housing 180 to inhibit leakage through the gap G between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175. In an alternative embodiment, the sealing liquid supplied under pressure to the cavity 190 of the mechanical capacity control device housing 180 to inhibit leakage through the gap G between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175 is different than the sealing liquid used in the compressor.

[0020] In use, the sealing liquid delivery system 100 supplies the sealing liquid under pressure with the pressurized sealing liquid delivery member 200 to the cavity 190 of the mechanical capacity control device housing 180 to inhibit leakage through the gap G between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175.

[0021] Although the sealing liquid control orifice 210 and the pressurized sealing liquid delivery supply line 200 of the sealing liquid delivery system 100 has been shown and described in conjunction with a top-mounted mechanical capacity control device 110 in FIGS. 2A-2C, in alternative embodiments, the sealing liquid control orifice 210 and the internally or externally routed pressurized sealing liquid delivery supply line 200 of the sealing liquid delivery system 100 may be used in conjunction with a side-mounted mechanical capacitycontrol device 110 (FIG. 3) and / or a bottom-mounted mechanical capacity control device 110(FIG. 4) of a screw compressor 120.

[0022] Tlrrough the proposed mechanical capacity control device 110 and sealing liquid delivery system 100, the leakage problems of the prior art through the gap between the mechanical capacity control device housing and the mechanical capacity control valve in topmounted mechanical capacity control devices, side-mounted mechanical capacity control device, and bottom-mounted mechanical capacity control devices where gravity or centrifugal force does not move sealing liquid to the gap are mitigated without the increased cost and / or decreased functionality of design tradeoffs made to decrease leakage such increasing overlap, increasing valve size, decreasing rotor housing window area, decreasing tire clearance between the valve and the rotor housing and designing the valve to open more abruptly. The proposed mechanical capacity control device 110 and sealing liquid delivery system 100 supplies sealing liquid under pressure to the cavity 190 of the mechanical capacity control device housing 180 to inhibit leakage through the gap G between the mechanical capacity control device housing 180 and the mechanical capacity control valve 175 even though the mechanical capacity control valve 175 is not in a location that provides unintentional sealing liquid.

[0023] While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed.

[0024] The foregoing detailed description has set forth various example implementations of the devices and / or processes via the use of diagrams, schematics, and examples. Insofar as such diagrams, schematics, and examples contain one or more functions and / or operations, each function and / or operation within such diagrams, or examples can be implemented, individually and / or collectively, by a wide range of structures. While certain example implementations have been described, these implementations have been presented by way of example only and are not intended to limit the scope of the protection. Indeed, the novel methods and apparatuses described herein may be embodied in a variety" of other forms. Furthermore, various omissions. substitutions and changes in the form of the devices and systems described herein may be made without departing from the spirit of the protection. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the protection.

Claims

CLAIMSWhat is claimed is:1 . A sealing liquid delivery system for a mechanical capacity control device of a screw compressor, comprising: a mechanical capacity control device including a mechanical capacity control valve movable to vary an amount of gas compressed by tire screw compressor; a mechanical capacity control device housing including a cavity configured to receive the mechanical capacity control device, a gap formed between the mechanical capacity control device housing and the mechanical capacity control valve: a pressurized sealing liquid delivery member carried by the mechanical capacity' control device housing and configured to supply sealing liquid under pressure to the cavity of the mechanical capacity' control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity' control valve.

2. The sealing liquid delivery system of claim 1, wherein the mechanical capacity control valve is a rotary' spool valve that rotates to open or close passages that vary the amount of gas compressed by the scr ew compressor.

3. The sealing liquid delivery' system of claim 1, wherein the mechanical capacity control valve is one of a sliding valve, a poppet valve, and a gate valve designed with a gap between the valve mechanism and its seat to open or close passages that vary the amount of gas compressed by the screw compressor.

4. The sealing liquid delivery system of any of claims 1-3, wherein the sealing liquid delivery system includes the sealing liquid and the sealing liquid is the same as or different from a sealing liquid used in the compressor.

5. The sealing liquid delivery system of any of claims 1 -4. wherein the pressurized sealing liquid delivery member includes a sealing liquid contr ol orifice in communication with the cavity of the mechanical capacity control device housing to supply sealing liquid under pressur e to the cavity of the mechanical capacity control device housing.

6. The sealing liquid delivery system of claim 5, wherein the pressurized sealing liquid delivery member includes an internally or externally routed sealing liquid supply line earned by the mechanical capacity control device housing and in communication with the sealing liquid control orifice to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing.

7. The sealing liquid deliveiy system of any of claims 1 -6. wherein the mechanical capacity control device housing includes an intake end and a discharge end, the intake end located closer than the discharge end to a gas outlet of the screw compressor and the discharge end located closer than the intake end to a gas inlet of the screw compressor, the intake end carrying the pressurized sealing liquid delivery member.

8. The sealing liquid deliveiy system of any of claims 1-7, wherein the mechanical capacity control device is a top-mounted mechanical capacity control device.

9. The sealing liquid delivery system of any of claims 1-7, wherein the mechanical capacity control device is a side-mounted mechanical capacity control device.

10. The sealing liquid delivery system of any of claims 1-7, wherein the mechanical capacity control device is a bottom-mounted mechanical capacity control device.

11. A method of using the sealing liquid deliveiy system of claim 1, comprising: supplying with the pressurized sealing liquid delivery member the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

12. The method of claim 11 , wherein the mechanical capacity control valve is a rotary spool valve that rotates to open or close passages that vary the amount of gas compressed by the screw compressor, and supplying includes supplying the sealing liquid under pressure to the cavity of the mechanical capacity control device while the rotary spool valve rotates to open or close passages that vary the amount of gas compressed by the screw compressor.

13. The method of claim 11, wherein the mechanical capacity control valve is one of a sliding valve, a poppet valve, and a gate valve designed with a gap between the valvemechanism and its seat to open or close passages that vary the amount of gas compressed by the screw compressor, and supplying includes supplying the sealing liquid under pressure to the cavity of the mechanical capacity control device while one of the sliding valve, the poppet valve, and the gate valve opens or close passages that vary the amount of gas compressed by the screw compressor.

14. The method of any of claims 11-13, wherein the sealing liquid delivery system includes the sealing liquid and the sealing liquid is the same as or different from a sealing liquid used in the compressor, and supplying includes supplying the same sealing liquid as the sealing liquid used in the compressor under pressure to the cavity of the mechanical capacity control device or supplying a different sealing liquid than the sealing liquid used in the compressor under pressure to the cavity of the mechanical capacity control device.

15. The method of any of claims 11-14, wherein the pressurized sealing liquid delivery member includes a sealing liquid control orifice in communication with the cavity of the mechanical capacity control device housing to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing, and supplying includes supplying with the sealing liquid control orifice the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

16. The method of claim 15, wherein the pressurized sealing liquid delivery member includes an internally or externally routed sealing liquid supply line carried by the mechanical capacity" control device housing and in communication with the sealing liquid control orifice to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing, and supplying includes supplying with the sealing liquid supply line and the sealing liquid control orifice the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

17. The method of any of claims 11-16, wherein the mechanical capacity control device housing includes an intake end and a discharge end, the intake end located closer than the discharge end to a gas outlet of the screw compressor and the discharge end located closer than the intake end to a gas inlet of the screw compressor, the intake end carrying thepressurized sealing liquid delivery member, and supplying includes supplying with the pressurized sealing liquid delivery member in the intake end the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

18. The method of any of claims 11-17, wherein the mechanical capacity control device is a top-mounted mechanical capacity control device, and supplying includes supplying with the pressurized sealing liquid delivery member in the top-mounted mechanical capacity control device the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

19. The method of any of claims 11-17, wherein the mechanical capacity control device is a side-mounted mechanical capacity control device, and supplying includes supplying with the pressurized sealing liquid delivery member in the side-mounted mechanical capacity control device the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

20. The method of any of claims 11-17, wherein the mechanical capacity control device is a botom-mounted mechanical capacity control device, and supplying includes supplying with the pressurized sealing liquid delivery member in the botom-mounted mechanical capacity control device the sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

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