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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0529497 (1990-05-29) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 8 인용 특허 : 0 |
The plunger of the valve has a ball of reduced diameter, so that it is inwardly spaced from the ribs of the cage. The plunger is centralized and guided by top and bottom stems attached to the ball and working in apertured webs carried by the cage and seat member. The cage has 3 ribs only, so that th
A check valve for use in a downhole rod pump, said valve comprising a top sub, barrel and nose sub threaded together to from a tubular housing, said valve further comprising a cage, plunger and seat member, said cage comprising upper and lower connectors joined by upstanding spaced apart ribs whereb
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