Expanding gate valve with pneumatic actuator

Details Expanding gate valve with pneumatic actuator Expanding gate valve with pneumatic actuator

1985-09-03

1986-04-29

Weakley, Harold W.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251 63, 251 636, 251196, 91161, 92 62, 92 65, F16K 31143

Patent

active

045852073

ABSTRACT:
A piston type pneumatic powered actuator (9) for operating a valve (10) of the expanding gate type wherein velocity of the piston-stem-gate drive train is maintained substantially constant in the latter stage of the actuator stroke. The actuator (9) includes an assembly of dual pistons (61,75) which are adapted to be driven by fluid pressure in one direction to operate the valve but are returned by spring means (66,67) when the fluid pressure is removed. A drive piston (61) directly connected to the actuator stem (23) is nested within a primary piston (75) which is not connected to the actuator stem (23) but moves the drive piston (61) when actuating pneumatic fluid is applied to the actuator (9). A stop (85) affixed to the primary piston (75) is adapted to cooperatively engage the actuator housing (40) to terminate the stroke of the primary piston (75) prior to termination of the stroke of the drive piston (61). An orifice (91) through the primary piston (75 ) allows continuing flow of actuating fluid to the face of the drive piston (61) after the stroke of the primary piston (75) is terminated. Termination of the stroke of the primary piston (75) occurs when fluid communication through the valve is first established.

REFERENCES:
patent: 3053050 (1962-09-01), Sommerer
patent: 4296679 (1981-10-01), Mattsson
patent: 4538506 (1985-09-01), Mattsson

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