F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
62/46, 230/77
F04B 1/28 (2006.01) F04B 27/10 (2006.01) F04B 27/18 (2006.01)
Patent
CA 1132508
D-2,351 C-3091 Abstract of the Disclosure A modulation delay valve for a variable capa- city compressor operative to prevent the premature reduction of the pumping capacity of the compressor. A compressor suction chamber pressure sensing bellows, located in a pressure control cell, regulates a hydraulic control valve which in turn controls the flow of oil to a hydraulic cylinder operative to vary the displacement of the compressor. The delay valve functions, by sensing a compressor discharge reference pressure, to delay the operation of the hydraulic control valve by cutting-off communication of the suction pressure signal to the bellows cell allowing the compressor to maintain its maximum pumping rate. Upon the compressor discharge chamber pressure falling below the reference pressure the delay valve discharge cavity pressure corresponsingly falls, allowing the delay valve to open communication between the bellows control cell and the compressor suction chamber to resume modulation of the compressor.
340804
Atkinson Ward J.
Widdowson Richard E.
General Motors Corporation
Gowling Lafleur Henderson Llp
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