Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Patent
1985-01-09
1985-10-01
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
137116, G05D 1610
Patent
active
045439761
ABSTRACT:
A control valve assembly incorporates a piston and a flow control valve 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 second 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 piston and the force in the first spring.
REFERENCES:
patent: 3165113 (1965-01-01), Schultz
patent: 3444880 (1969-05-01), Mercier
patent: 3575192 (1971-04-01), MacDuff
patent: 4105041 (1978-08-01), Axthammer
patent: 4378816 (1983-04-01), Peiffer
Lucas Industries Public Limited Company
Schwadron Martin P.
Shay James R.
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