Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1997-12-17
1999-09-14
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60426, 91446, F16D 3102
Patent
active
059504293
ABSTRACT:
A hydraulic fluid is supplied from a tank to a plurality of actuators by a variable displacement pump which produces an output pressure that is a constant amount greater than a pressure at a control input. A mechanism senses the greatest pressure among the workports to provide a first load-dependent pressure and a second load-dependent pressure which is greater than the first load-dependent pressure when the pump operates a maximum flow capacity. Each valve section includes a pressure compensating valve which controls the fluid flow to the associated actuator in response to a pressure differential between the metering orifice and either the first or second load-dependent pressures. When the pump operates at maximum flow capacity, actuators connected to the valve sections in which the pressure compensating valve responds to the first load-dependent pressure receive the fluid flow on a priority basis as compared to the other valve sections. Thus the system operates the priority actuators as normally as possible during a maximum pump flow situation by reducing the fluid flow to non-priority actuators.
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HUSCO International Inc.
Lopez F. Daniel
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