Hydraulic power system with a load-sensing and a cutoff control

Details Hydraulic power system with a load-sensing and a cutoff control Hydraulic power system with a load-sensing and a cutoff control

1978-03-31

1979-05-08

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60452, 417212, F16H 3946

Patent

active

041528964

ABSTRACT:
A control system for a variable displacement pump which powers a load actuator via a selector valve and which has its displacement varied by a pump actuator of the single-acting type. The system includes a load-sensing control valve for selectively communicating the pump actuator with a pressurized fluid source or with a fluid drain in accordance with a differential between the sum of the pump output pressure and the pump actuator pressure and the sum of the load actuator pressure and the force of a spring. Also included is a normally open, cutoff control valve, connected serially with the load-sensing control valve, for placing the pump actuator in communication with a fluid drain in response to the sum of the pump output pressure and pump actuator pressure acting against the force of a spring.

REFERENCES:
patent: 2713772 (1955-07-01), Horlacher
patent: 3830594 (1974-08-01), Hein et al.

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