Valve and pump control for a hydraulic system

Details Valve and pump control for a hydraulic system Valve and pump control for a hydraulic system

1975-12-31

1977-03-15

Croyle, Carlton R.

Pumps

Correlated pump and motor or clutch control

60433, 60470, 37DIG7, F04B 900

Patent

active

040121755

ABSTRACT:
The operation of a 4-way, open-center, three position hydraulic valve is coordinated with the operation of the pump for the hydraulic system in which the valve is controlling flow. As the valve is moving from its open-center position to either one of its other two operative positions, a switch maintains the power circuit for the pump open and closes that circuit to activate the pump after the valve has assumed one of the other two positions.

REFERENCES:
patent: 1231613 (1917-07-01), James
patent: 2219359 (1940-10-01), Goit et al.
patent: 2746251 (1956-05-01), Ashton
patent: 2956728 (1960-10-01), Goepfrich et al.
patent: 3036433 (1962-05-01), Loup
patent: 3443380 (1969-05-01), Karazija
patent: 3630025 (1970-06-01), Henry
patent: 3945768 (1976-03-01), Georgi

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