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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0676841 (1991-03-28) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 68 인용 특허 : 0 |
A fail safe valve actuator is disclosed that is powered by an electric motor. A valve stem with a helical groove is moved in one direction by a ball nut rotated by the electric motor to move a valve member to its operating position. The valve member is held in operating position by a solenoid. When
A fail safe valve actuator comprising a housing for mounting on a valve body, a valve stem having one portion adapted to be connected to the valve member of a valve and another portion having an elongated helical groove in its outer surface, means mounting the valve stem in the housing to reciprocat
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