发明名称 |
Triple valve blow out preventer |
摘要 |
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.
|
申请公布号 |
US2006191679(A1) |
申请公布日期 |
2006.08.31 |
申请号 |
US20050201056 |
申请日期 |
2005.08.09 |
申请人 |
SENEVIRATNE PADMASIRI D;WELLS LAWRENCE;MASON DAVID B |
发明人 |
SENEVIRATNE PADMASIRI D.;WELLS LAWRENCE;MASON DAVID B. |
分类号 |
E21B33/06;E21B21/10;E21B34/00;F16K5/06 |
主分类号 |
E21B33/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|