Back pressure valve

Details Back pressure valve Back pressure valve

1993-01-25

1993-12-07

Rivell, John

Refrigeration

Refrigeration producer

Compressor-condenser-evaporator circuit

137538, 138 45, 138 46, F25B 3102, F16K 1704

Patent

active

052674525

ABSTRACT:
A shaft-mounted piston is reciprocally disposed on the axis of a valve inlet opening such that increased pressure from within the motor casing of a centrifugal compressor causes the piston to move in the direction of the refrigerant flow, against a biasing means, to increase the flow of refrigerant through the opening, and to thereby regulate the pressure drop across said valve to a predetermined level. The shaft has an extended portion projecting through the piston toward the motor casing such that when the compressor is shut down and the pressure is thus greater in the valve than in the motor casing, the piston can move out of the inlet opening to the extended portion of the shaft to thereby allow the unrestricted flow of refrigerant into the motor casing.

REFERENCES:
patent: 1798536 (1931-03-01), Hofmann
patent: 2212833 (1940-08-01), Huber
patent: 2247449 (1941-07-01), Neeson
patent: 3146605 (1964-09-01), Rachfal et al.
patent: 3158009 (1964-11-01), Rayner
patent: 3163999 (1965-01-01), Ditzler et al.
patent: 3204664 (1965-09-01), Gorchev et al.
patent: 3877489 (1975-04-01), Louie et al.
patent: 4383550 (1983-05-01), Sotokazu
patent: 4770212 (1988-09-01), Wienck
patent: 4781161 (1988-11-01), Sausner et al.

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