|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||F16K-031/12 F15B-018/00 F15B-020/00|
|미국특허분류(USC)||251/26 ; 60/404 ; 60/405 ; 60/416|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 26 인용 특허 : 0|
A hydraulic actuator for a gate or like valve such as the main steam isolation valve in an electric power plant characterized in that the actuator is a compact self-contained unit secured to the valve housing and comprises a hydraulic cylinder having its piston rod connected to the movable valve member to open or close the valve, an air-driven hydraulic pump for pressurizing dual hydraulic circuits (active and standby) each of which includes an accumulator, an air-piloted accumulator control valve, an air-piloted directional control valve for the hydraul...
A self-contained hydraulic actuator comprising a housing adapted to be secured to a valve housing for opening and closing said valve by hydraulically actuating a movable valve member is said valve housing; said actuator housing comprising a hydraulic motor having a hydraulically-actuated component adapted to be secured to said valve member, a reservoir, an air-driven hydraulic pump, and an air-piloted directional control valve operatively interconnected together for fluid pressure actuation of said component selectively in opposite directions in response...