发明名称 |
Safety valve having extension spring closure mechanism |
摘要 |
A safety valve having an extension spring closure mechanism. In a described embodiment, a valve for use in a subterranean well is provided which includes a biasing device and a closure member having open and closed positions. The biasing device has a length which decreases as the closure member displaces toward the closed position. The biasing device may be an extension spring.
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申请公布号 |
US7021386(B2) |
申请公布日期 |
2006.04.04 |
申请号 |
US20030642801 |
申请日期 |
2003.08.18 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
VICK, JR. JAMES D.;COLLINS LEO G. |
分类号 |
E21B34/06;E21B34/00;F16K15/03 |
主分类号 |
E21B34/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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