发明名称 |
Safety valve with extension springs |
摘要 |
A safety valve with extension springs. In a described embodiment, a valve for use in a subterranean well includes a closure member having open and closed positions. A structure displaces to cause the closure member to displace between the open and closed positions. A biasing device has a length which decreases as the structure displaces to cause the closure member to displace toward the closed position.
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申请公布号 |
US7597149(B2) |
申请公布日期 |
2009.10.06 |
申请号 |
US20040004471 |
申请日期 |
2004.12.03 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
WILLIAMSON, JR. JIMMIE R.;VICK, JR. JAMES D.;GALINDO ABRAM |
分类号 |
E21B34/10 |
主分类号 |
E21B34/10 |
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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