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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0702295 (1985-02-15) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 29 인용 특허 : 4 |
A subsurface solenoid well safety valve which is locked in the open position, after being opened mechanically, for preventing the valve from closing. A valve closure member is controlled by a tubular member which is mechanically moved downwardly to open the valve. An armature movable in the housing
A solenoid operated well safety valve comprising, a housing having a bore, a valve closure member in the bore moving between open and closed positions, a tubular member telescopically movable in the housing for controlling the movement of the valve closure member, first biasing means acting on said
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