Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1994-06-02
1996-01-30
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251285, 92117A, F16K 31122
Patent
active
054875277
ABSTRACT:
An actuator for fluid control valves with a reversible power module having a stationary inner member and a coaxially aligned movable outer member coupled to the valve flow control element and slidably movable on the inner member. A chamber is formed between respective ends of the members. Pneumatic pressure applied to the chamber drives the movable member to actuate the valve in a first direction. A spring returns the movable member in the second direction. A second chamber is defined within the inner member and pneumatic pressure applied to the second chamber drives the movable member with or without the spring.
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Fisher Controls International Inc.
Lee Kevin L.
Schwadron Martin P.
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