Control valve

Details Control valve Control valve

1979-09-20

1981-09-08

Nilson, Robert G.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91421, 91443, 251 60, 251 634, F15B 13042

Patent

active

042878128

ABSTRACT:
A control valve is provided between a direction-changeover valve and an actuator in a fluid-pressure operating system. This control valve includes a body having an inlet and an outlet; a fluid passage interconnecting the inlet and the outlet; a valve body and a valve seat which are cooperative with each other to define a clearance therebetween and positioned within the fluid passage; a spring for resiliently urging the valve body toward a constrictive position to where a diminished clearance is defined between the valve body and the valve seat; and pressure responsive means for displacing the valve body in an opposite direction against the force applied by the spring thereby enlarging the clearance and bringing the valve body to its fully open position. An adjusting rod enabling adjustment of the first position of the valve body is provided, and a pilot piston operates under a pilot fluid pressure applied through a pilot port for forcing the valve body to its fully open position.

REFERENCES:
patent: 1566814 (1925-12-01), Bliss
patent: 3981479 (1976-09-01), Foster
patent: 4018136 (1977-04-01), Kaetterhenry
patent: 4022113 (1977-05-01), Blatt

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