发明名称 |
Pilot operated safety valve |
摘要 |
A safety valve of the type having a valve body which is closed in response to an excess flow of fluid comprises a pilot piston which causes a sudden increase of the pressure in a cavity around the lower end of the valve stem if the pressure difference across the valve reaches a preset value, thereby controlling the valve such that is closes at a well defined setting point.
|
申请公布号 |
US4911199(A) |
申请公布日期 |
1990.03.27 |
申请号 |
US19890344567 |
申请日期 |
1989.04.28 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. |
发明人 |
BONTENBAL, PIETER J.;BOUSEMA, SIETSE |
分类号 |
F16K17/22;E21B34/08 |
主分类号 |
F16K17/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|