Valves and valve actuators

Details Valves and valve actuators Valves and valve actuators

1984-04-20

1985-05-28

Scott, Samuel

Valves and valve actuation

Fluid actuated or retarded

With mechanical movement between actuator and valve

251 1A, 251251, 92 52, 92130C, 92130D, F16K 3100

Patent

active

045195757

ABSTRACT:
There is disclosed a gate valve which is moved to open position by an extendible and retractable, fluid-operated actuator, and which is moved to closed position, upon exhaust of operating fluid, by coil springs which urge follower parts reciprocable with a stem on the gate, and which extend from the valve body into a housing connected on the valve body, into engagement with cam surfaces on the housing. The cam surfaces are so arranged that the coil springs initially move the gate from open toward closed position with a relatively small force, and then move it into fully closed position with a force which is sufficiently larger to shear a wire line or other obstruction in the flowway of the valve body which would otherwise prevent closing of the gate.

REFERENCES:
patent: 1711565 (1929-05-01), Hatfield
patent: 4077303 (1978-03-01), Poulsen
patent: 4372333 (1983-02-01), Goans

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