Control valve

Details Control valve Control valve

1986-06-16

1987-05-12

Michalsky, Gerald A.

Valves and valve actuation

With means to increase head and seat contact pressure

Fluid pressure

91465, 137596, 13762569, 137865, F15B 1304

Patent

active

046643567

ABSTRACT:
A valve includes a valve housing having a valve bore with a first valve member movable therein to control fluid communication between a pump, a reservoir and a hydraulic function. The first valve member includes annular grooves which receive pressure controlled seals. A second valve member is movable in the valve bore and is connected to an actuator. The first and second valve members cooperate to form a pre-control valve which controls pressurization of the pressure controlled seals. The second valve member also connects the actuator with the first valve member so that the seals are relieved of pressure before the first valve member is moved.

REFERENCES:
patent: 2675024 (1954-04-01), Clark
patent: 3605810 (1971-09-01), Moroney
Deere & Company, "John Deere Technical Manual", TM-4363, Jun. 1982, pp. 70-25-1 to 70-25-9.

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