Two pump hydraulic system with relief valves having different re

Details Two pump hydraulic system with relief valves having different re Two pump hydraulic system with relief valves having different re

1991-03-08

1994-03-01

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60421, 60429, 60468, F16D 3102

Patent

active

052896803

ABSTRACT:
A hydraulic circuit for a working vehicle comprising a first pump, a second pump, a first actuator, a second actuator, and a selector valve having a plurality of control positions. The selector valve is switchable between a first position for connecting the first pump to the first actuator and the second pump to the second actuator, and a second position for connecting the first pump and the second pump to the second actuator. This circuit includes a first relief valve disposed between the selector valve and the first pump, and a second relief valve disposed between the selector valve and the second pump. The first relief valve is set to a higher relief pressure than the second relief valve.

REFERENCES:
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patent: 3535877 (1970-10-01), Becker et al.
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patent: 4141280 (1979-02-01), Lorimor
patent: 4204405 (1980-05-01), Basham
patent: 4305571 (1981-12-01), Hystad
patent: 4355693 (1982-10-01), Hirooka et al.
patent: 4367624 (1983-01-01), Ogata et al.
patent: 4422290 (1983-12-01), Huffman
patent: 4516467 (1985-05-01), Keeney et al.
patent: 4819430 (1989-04-01), Becker

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