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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||251/061.4 ; 251/063.6 ; 92/117A ; 92/103F|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 9 인용 특허 : 60|
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 interconnec...
[ It is claimed:] [1.] In an actuator for operating a control element used to regulate the flow of fluid through a fluid control valve in response to a control valve positioning instrument, said actuator including a pair of coaxially aligned members comprising a movable external member externally mounted with respect to a fixed internal member and axially movable with respect to the fixed internal member, said members having adjacent ends, a chamber being defined between said adjacent ends for moving said one movable external member away from said fixed ...