Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Condition responsive means for modifying working member...
Patent
1997-02-20
1998-10-27
Nguyen, Hoang
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Condition responsive means for modifying working member...
91532, 60413, F15B 1100
Patent
active
058264876
ABSTRACT:
An unloader valve is connected to a pump and has first and second ends, a priority flow port communicating with the first end and being connected to a first conduit connected to a first hydraulic circuit, an excess flow port communicating with a tank, and a spring disposed at the second end biasing the unloader valve to a priority flow position with a force sufficient to maintain the pressure in the priority flow port above a predetermined minimum level. The unloader valve is biased toward an unloading position in opposition to the spring force by pressure generated force acting on the second end. A check valve is disposed between the first conduit and a second conduit connected to a second hydraulic circuit. A valve device controls the pressure at the second end of the unloader valve in response to pressure in the second conduit so that pressure in the second conduit is maintained above a second higher predetermined level.
REFERENCES:
patent: 3811363 (1974-05-01), Cryder
patent: 3994133 (1976-11-01), Pfeil et al.
patent: 4337620 (1982-07-01), Johnson
patent: 4635439 (1987-01-01), Wible
patent: 4966066 (1990-10-01), Kauss et al.
patent: 5072802 (1991-12-01), Tischer
patent: 5179835 (1993-01-01), Casey et al.
Burrows J. W.
Caterpillar Inc.
Grant John W.
Nguyen Hoang
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