| 发明名称 |
VALVE |
| 摘要 |
<p>A subsurface valve which functions as a lubricator valve and a retainer valve in response to changes in control pressure which may be pumped through to kill a well and which is provided with a lock means for locking the valve in closed position.</p> |
| 申请公布号 |
CA1200758(A) |
申请公布日期 |
1986.02.18 |
| 申请号 |
CA19830426464 |
申请日期 |
1983.04.21 |
| 申请人 |
OTIS ENGINEERING CORPORATION |
发明人 |
NOACK, TIMOTHY J.;RATHIE, LESTER C. |
| 分类号 |
E21B34/00;E21B34/04;(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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