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Patent Searching and Data

Document Type and Number:
Japanese Patent JP2000508410
Kind Code:
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 formed between respective ends of the members includes a preformed bladder. Pneumatic pressure applied to the bladder drives the movable member to actuate the valve in a first direction. A spring returns the movable member in the second direction. The preformed bladder is formed with two pieces including an interconnecting perimeter portion. During bladder actuation the bladder perimeter portion is displaced from the bladder inner diameter to the bladder outer diameter with the bladder material in tension to thereby prolong bladder life.

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JP2001327620OPEN VALVE
Eggleston, Philip, Wayne
Application Number:
Publication Date:
July 04, 2000
Filing Date:
March 31, 1997
Export Citation:
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Fisher Controls International, Inc.
International Classes:
F16K31/122; F16K31/126; (IPC1-7): F16K31/122; F16K31/126
Attorney, Agent or Firm:
Yoshihiro Tsunoda