검색연산자 | 기능 | 검색시 예 |
---|---|---|
() | 우선순위가 가장 높은 연산자 | 예1) (나노 (기계 | machine)) |
공백 | 두 개의 검색어(식)을 모두 포함하고 있는 문서 검색 | 예1) (나노 기계) 예2) 나노 장영실 |
| | 두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색 | 예1) (줄기세포 | 면역) 예2) 줄기세포 | 장영실 |
! | NOT 이후에 있는 검색어가 포함된 문서는 제외 | 예1) (황금 !백금) 예2) !image |
* | 검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색 | 예) semi* |
"" | 따옴표 내의 구문과 완전히 일치하는 문서만 검색 | 예) "Transform and Quantization" |
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) | E21B-034/00 E21B-034/06 |
미국특허분류(USC) | 166/332 ; 166/665 ; 166/664 ; 251/12921 |
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 is actuated by a solenoid coil for locking the tubular member in the open position to the valve housing. Deenergization of the coil releases the armature and the lock and allows the tubular member to be biased to the open position.
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 tubular member for moving the tubular member in a direction to close said valve, an armature movable in the housing, a solenoid coil adjacent to the housing for moving the armature, second biasing means acting on the armature for moving the armature upwardly, ...