| 发明名称 |
AFPROEVNINGSVENTIL TIL BOREHUL |
| 摘要 |
<p>A drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, are transmitted substantially entirely to said housing.</p> |
| 申请公布号 |
DK150381(A) |
申请公布日期 |
1981.10.04 |
| 申请号 |
DK19810001503 |
申请日期 |
1981.04.02 |
| 申请人 |
HALLIBURTON CO |
发明人 |
MCMAHAN M E;BARRINGTON B Q |
| 分类号 |
E21B34/00;E21B34/10;E21B47/10;(IPC1-7):E21B/ |
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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