Control system for hydraulic actuator

Details Control system for hydraulic actuator Control system for hydraulic actuator

1980-02-15

1983-01-11

Hershkovitz, Abraham

Power plants

Pressure fluid source and motor

Having plural energy outputs

60486, 91 6, 91509, F15B 1116

Patent

active

043676243

ABSTRACT:
A control system for a hydraulic actuator comprising a first pump with large displacement capacity, a second pump with small displacement capacity, a pilot pump, a first pilot operated spring centered control valve connected at the input side thereof to the first pump, the output side of which is selectively connected to the hydraulic actuator and drain, a second pilot operated spring centered control valve connected at the input side thereof to the second pump, the output side of which is selectively connected to the hydraulic actuator and drain, and a third control valve for pilot pressure connected at the input side thereof to the pilot pump, the output side of which is connected to the first and second control valves wherein the second control valve is adapted to be actuated by a pilot pressure lower than a pilot pressure which actuates the first control valve.

REFERENCES:
patent: 2336955 (1943-12-01), Ott
patent: 3355994 (1967-12-01), Malott
patent: 3817153 (1974-06-01), Zunzer
patent: 3835647 (1974-09-01), Huffman
patent: 3952510 (1976-04-01), Peterson
patent: 4112821 (1978-09-01), Bianchetta
patent: 4142445 (1979-03-01), Lohbauer
patent: 4210061 (1980-07-01), Bianchetta

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