| 发明名称 | Internal blow out preventer | ||
| 摘要 | An internal blow out preventer for use in a drill string, comprising a housing having an outer valve closure element and where the outer valve closure element is configured to be moved between an open and a closed position, wherein the outer valve closure element is provided with an inner valve closure element that is configured to be moved between an open and a closed position inside the outer valve closure element. | ||
| 申请公布号 | US9422785(B2) | 申请公布日期 | 2016.08.23 |
| 申请号 | US201414580342 | 申请日期 | 2014.12.23 |
| 申请人 | National Oilwell Norway AS | 发明人 | Kukielka Slawomir |
| 分类号 | E21B33/08;E21B34/00;F16K11/12;F16K11/087;E21B21/10;F16K5/06;F16K5/20 | 主分类号 | E21B33/08 |
| 代理机构 | Conley Rose P.C. | 代理人 | Conley Rose P.C. |
| 主权项 | 1. An internal blow out preventer comprising: a housing having a central axis and a bore extending axially therethrough; a spherical outer valve closure element rotatably disposed in the housing, wherein the outer valve closure element is configured to move between an open position and a closed position; and a spherical inner valve closure element rotatably disposed within the outer valve closure element, wherein the inner valve closure element is configured to move between an open position and a closed position within the outer valve closure element; wherein the outer valve closure element comprises a pair of radially extending shafts rotatably coupled to the housing. | ||
| 地址 | Kristiansand S NO | ||