发明名称 |
Subsurface safety valve |
摘要 |
A subsurface safety valve having a flapper-like pivoting closure element that is moved to and from the open and closed positions by a reciprocating operator assembly. When moved to the open position, the closure element is pivoted out of the flow path to protect it from possible damage.
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申请公布号 |
US4287954(A) |
申请公布日期 |
1981.09.08 |
申请号 |
US19790068077 |
申请日期 |
1979.08.20 |
申请人 |
HYDRIL COMPANY |
发明人 |
KRAUSE, WILLIAM F.;TURNER, EDWIN C. |
分类号 |
E21B34/00;E21B34/10;(IPC1-7):E21B43/12 |
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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