Flow-sensitive pressure limiting valve for hydraulic equipment

Details Flow-sensitive pressure limiting valve for hydraulic equipment Flow-sensitive pressure limiting valve for hydraulic equipment

1975-04-02

1976-05-18

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

417252, 417300, G05D 701

Patent

active

039570754

ABSTRACT:
A relief valve for limiting the pressure of the output of a feed pump being furnished to a main hydraulic pump is provided not only with a bore through the valve disk leading to a chamber at the rear of the guide piston for counteracting, as relief valving continues, the force of the spring tending to keep the valve closed, but also a pressure piston, in the form of an annular flange on the guide piston, subdividing an outer cylindrical space into two chambers respectively connected to a constriction in a hydraulic conduit, so that the amount of flow through the constriction will additionally modify the limit pressure at which relief valving takes place. The device is used to reduce the limit pressure when the feed pump provides excessive oil feed to the main pump.

REFERENCES:
patent: 3384020 (1968-05-01), Searle
patent: 3563262 (1971-02-01), Wood
patent: 3865127 (1975-02-01), Lewis

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