发明名称 |
Surface controlled subsurface safety valve |
摘要 |
A surface controlled, subsurface safety valve in which a force due to control pressure fluid from a first source at the surface for opening the valve is opposed in part by a force due to reference pressure fluid from a second source at the surface, whereby the valve closes in response to a fail condition.
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申请公布号 |
US5251702(A) |
申请公布日期 |
1993.10.12 |
申请号 |
US19910730702 |
申请日期 |
1991.07.16 |
申请人 |
AVA INTERNATIONAL CORPORATION |
发明人 |
VAZQUEZ, GONZALO |
分类号 |
E21B34/00;E21B34/10;(IPC1-7):F21B34/10 |
主分类号 |
E21B34/00 |
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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