Control valve for fluid actuator

Details Control valve for fluid actuator Control valve for fluid actuator

1975-03-24

1976-03-16

Cohan, Alan

Fluid handling

Systems

Line condition change responsive release of valve

251 89, 13762566, F16K 3100

Patent

active

039439747

ABSTRACT:
A control valve for a fluid actuator has a slide valve member mounted within a housing with an external knob on one end and a piston on the other end. The knob may be manually operated for resetting the piston. When the main flowline pressure reaches a high or low pressure outside the fluid pressure operating range the piston is seated and fluid is exhausted from the actuator for effecting movement of the main valve member. The control valve is maintained in its exhaust position by a spring continuously urging the piston into a seated position. An annular seal engages the face of the piston in seated position to expose only a relatively small surface area of the piston to fluid pressure when the piston is seated and the control valve is in an exhaust position. Means are provided to permit a venting or bleeding of fluid around the piston in the seated position of the piston in the event of leakage of fluid past the annular seal or temporary unseating of the piston resulting from vibrations or the like.

REFERENCES:
patent: 3823739 (1974-07-01), McMullan

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