发明名称 |
INTERNAL BLOW OUT PREVENTER BALL AND SEAT |
摘要 |
<p>An internal blow out preventer is provided that includes a ball 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 includes an undercut. A protective coating is applied to both the external surface and the undercut of the ball.</p> |
申请公布号 |
EP1676066(A2) |
申请公布日期 |
2006.07.05 |
申请号 |
EP20040817334 |
申请日期 |
2004.10.21 |
申请人 |
VARCO I/P, INC. |
发明人 |
SENEVIRATNE, PADMASIRI, DAYA;WELLS, LAWRENCE;MASON, DAVID, B. |
分类号 |
E21B21/10;E21B34/00;F16K5/06;(IPC1-7):F16K5/06;E03B1/00;F16K7/00 |
主分类号 |
E21B21/10 |
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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