F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
230/77
F04B 27/08 (2006.01) F04B 1/29 (2006.01) F04B 27/18 (2006.01)
Patent
CA 1123402
PRESSURE OPERATED HYDRAULIC CONTROL VALVE Abstract of the Disclosure A pressure operated control valve operative to regulate the flow of fluid to a hydraulic modulating cylinder having a fixed hydraulic bleed which cylinder operates a mechanism for vary- ing the displacement of a compressor of an automotive air condi- tioning system to maintain a predetermined control or system pressure. The system pressure continually surrounds a sealed bellows seated in the closed end of a tubular bellows cover. High pressure fluid is continually supplied to the control valve which has a ball and seat to totally restrict fluid flow to the modula- ting cylinder when the system pressure exceeds the setting pressure of the valve. When the system pressure drops below the setting pressure, the bellows extends against an axial pin which forces the ball from its seat, thus allowing high pressure fluid to flow to the compressor modulating cylinder operating the compressor mechanism and reducing the stroke of the compressor pistons. When the system pressure returns to the setting pressure, the bellows retracts moving the ball toward its seat thereby reducing hydraulic fluid flow to the modulating cylinder.
321178
General Motors Corporation
Gowling Lafleur Henderson Llp
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