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    Thermal expansion valve with rapid pressure equalizer
    2.
    发明授权
    Thermal expansion valve with rapid pressure equalizer 失效
    带膨胀压力平衡器的热膨胀阀

    公开(公告)号：US3699778A

    公开(公告)日：1972-10-24

    申请号：US3699778D

    申请日：1971-03-29

    Applicant: CONTROLS CO OF AMERICA

    Inventor： ORTH CHARLES D

    IPC: F16K17/19 ,  F16K31/68 ,  F25B41/06 ,  G05D23/12 ,  F25B41/04

    CPC classification number: F16K17/19 ,  F25B41/062

    Abstract: The thermostatic expansion valve is provided with an internal by-pass capable of providing rapid equalization of the pressure between the condenser and evaporator when the compressor shuts down. The valve controlling the refrigerant flow has an internal cavity in communication with the condenser pressure and a by-pass port in communication with the evaporator. The valve, urged towards the closed position by a spring, is actuated by the diaphragm through push pins. The push pins normally close the bypass port, either by the lower end of one or more of the push pins cooperating with a seat located at the by-pass port outlet or a valve means (e.g. a flanged collar which guides the valve) interposed the push pins and the by-pass port. With the valve in the closed position, the push pin(s) or valve means can be lifted off the by-pass port by condenser pressure in the cavity, as forces across the diaphragm equalize after shutdown of the compressor. The system pressure is then rapidly equalized through the by-pass port.

    Abstract translation: 恒温膨胀阀设有内部旁路，当压缩机关闭时，能够快速平衡冷凝器和蒸发器之间的压力。 控制制冷剂流的阀具有与冷凝器压力连通的内腔和与蒸发器连通的旁通口。 通过弹簧推向关闭位置的阀由隔膜通过推动销致动。 推杆通常通过旁路端口关闭，或者通过与位于旁路端口出口处的座部配合的一个或多个推销的下端或者阀装置（例如，引导阀的法兰套环） 插入推针和旁路口。 随着阀处于关闭位置，推压销或阀装置可以通过腔中的冷凝器压力从旁路端口提升，因为在关闭压缩机之后，跨过隔膜的力相等。 然后系统压力通过旁路端口快速平衡。

    Pilot operated evaporator pressure regulator valve
    3.
    发明授权
    Pilot operated evaporator pressure regulator valve 失效
    PILOT操作蒸发器压力调节阀

    公开(公告)号：US3614966A

    公开(公告)日：1971-10-26

    申请号：US3614966D

    申请日：1969-11-13

    Applicant: CONTROLS CO OF AMERICA

    Inventor： ORTH CHARLES D

    IPC: F16K17/10 ,  F25B41/06

    CPC classification number: F25B41/062 ,  F16K17/105 ,  F25B2341/067 ,  Y10T137/7766 ,  Y10T137/7767

    Abstract: THE INTERIOR OF THE BELLOWS IS SEALED AT ATMOSPHERIC PRESSURE SO THE PRESSURE ON THE OUTSIDE OF THE BELLOWS IS RESISTED BY THE ATMOSPHERIC PRESSURE WITHIN THE BELLOWS AS WELL AS BY THE SPRING. WHEN THE PRESSURE ON THE OUTSIDE OF THE BELLOWS (WHICH IS EVAPORATOR PRESSURE IN A REFRIGERATION SYSTEM) EXCEEDS A PREDETERMINED AMOUNT, THE BELLOWS TENDS TO COLLAPSE AND THE HEAD OF THE BELLOWS PULLS AWAY FROM THE ACTUATING PIN AND ALLOWS THE SPRING ACTING ON THE PILOT VALVE TO OPEN THE PILOT VALVE WHEREUPON THE PRESSURE TO THE RIGHT OF THE HEAD OF THE PISTON IS REDUCED, ALLOWING THE PISTON TO MOVE TO THE RIGHT AGAINST THE RETURN SPRING FORCE AND, THUS, OPEN THE OUTLET BY REGISTERING THE PORT IN THE PISTON WALL WITH THE SLOT IN THE STATIONARY SLEEVE. WHEN THE PRESSURE FALLS BELOW THE DESIRED AMOUNT, THE BELLOWS EXPANDS AND MOVES THE HEAD OF THE BELLOWS AGAINST THE ACTUATING PIN TO CLOSE THE PILOT VALVE. LEAKAGE BETWEEN THE PISTON AND SLEEVE TO THE PILOT VALVE CHAMBER RAPIDLY RAISES THE PRESSURE THEREIN SO THAT THE RETURN SPRING CAN MOVE THE PISTON TO CLOSE THE OUTLET. EVEN WITH THE OUTLET CLOSED, THE SLIGHT CLEARANCE BETWEEN THE PISTON AND SLEEVE ALLOWS SOME REFRIGERANT FLOW TO INSURE ADEQUATE FLOW TO THE COMPRESSOR TO KEEP THE COMPRESSOR LUBRICATED.

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