发明名称 |
TRIPLE VALVE BLOW OUT PREVENTER |
摘要 |
<p>A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein the central opening may include an undercut. A protective coating may also be applied to both the external surface and the undercut of the ball to increase the durability of each of the valves.</p> |
申请公布号 |
CA2618134(C) |
申请公布日期 |
2010.11.30 |
申请号 |
CA20062618134 |
申请日期 |
2006.07.17 |
申请人 |
VARCO I/P, INC. |
发明人 |
SENEVIRATNE, PADMISIRI DAYA;WELLS, LAWRENCE;MASON, DAVID B. |
分类号 |
E21B33/06;E21B21/10;E21B34/00;F16K5/06;F16K37/00 |
主分类号 |
E21B33/06 |
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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