Pilot-operated pressure regulator valve

Details Pilot-operated pressure regulator valve Pilot-operated pressure regulator valve

1982-04-23

1984-04-17

Tapolcai, William E.

Refrigeration

Automatic control

Refrigeration producer

1374895, F25B 4104

Patent

active

044426801

ABSTRACT:
A pilot-operated pressured regulator valve includes a main valve for controlling refrigerant flow in a refrigeration suction line. A pilot valve which is responsive to evaporator pressure controls a flow of high pressure refrigerant to the main valve for modulating the main valve. A bleed is provided for bleeding the high pressure refrigerant from the main valve. A solenoid-actuated shut-off valve controls the bleed flow from the main valve. The shut-off valve is selectively closed for maintaining the high pressure refrigerant in the main valve for closing the main valve. A bleed flow of high pressure is provided to the main valve when the shut-off valve is closed in order to maintain the main valve closed.

REFERENCES:
patent: 3414010 (1968-12-01), Sparrow
patent: 3435626 (1969-04-01), Wile et al.
patent: 3481363 (1969-12-01), Ray
patent: 3525355 (1970-08-01), Katchka
patent: 3552430 (1971-01-01), Love
patent: 3592225 (1971-07-01), Graham et al.
patent: 3880186 (1975-04-01), Turner et al.

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