Back pressure valve
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United States of America Patent
Stats
-
Dec 7, 1993
Issued Date -
N/A
app pub date -
Jan 25, 1993
filing date -
Jan 2, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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