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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0849125 (1986-04-07) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 10 인용 특허 : 6 |
Two forms of a valve, both useful as a standing valve in a well conduit, permitting upward production flow and preventing downward injection flow. Both forms of this valve may also be operated as injection valves, permitting downward injection flow and preventing upward production flow. One form of
A standing valve comprising: (a) a housing having a longitudinal flow passage therethrough and at least one lateral port in the housing wall communicating between said flow passage and the valve exterior; (b) annular valve means in said housing for controlling flow through said lateral port; (c) fir
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