Control valve for vehicle hydraulic systems

Details Control valve for vehicle hydraulic systems Control valve for vehicle hydraulic systems

1984-07-30

1985-03-12

Schwadron, Martin P.

Fluid handling

Self-proportioning or correlating systems

Self-proportioning flow systems

137116, G05D 1610

Patent

active

045038767

ABSTRACT:
A control valve assembly incorporates a flow control valve, and a piston which are both biassed in the same direction against pressure in an hydraulic accumulator by first and second respective springs. Accumulator pressure in a control chamber also acts to urge the flow control valve in the same direction as it is biassed by the spring and pressure from a pump acts to bias the flow control valve in the opposite direction. A pilot dump valve controlling communication between the chamber and an outlet connection is normally biassed into a closed position by a third spring. The dump valve is adapted to open at a cut-out pressure to dump pressure from the chamber, and the cut-out pressure is determined by the area of the seating of the dump valve over which the pressure in the chamber acts, and the force in the third spring. A cut-in pressure at which the dump valve closes is determined by the area of the first piston and the force in the second spring.

REFERENCES:
patent: 3165113 (1965-01-01), Schultz
patent: 3444880 (1969-05-01), Mercier
patent: 3575192 (1971-04-01), MacDuff

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