| 发明名称 |
Plug valve equipped with pressure equalization means |
| 摘要 |
Disclosed is a plug valve comprising displacement means (5) allowing equalization of upstream and downstream pressures existing on the plug (3), said equalization means being applied before the plug has been moved.
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| 申请公布号 |
US4577662(A) |
申请公布日期 |
1986.03.25 |
| 申请号 |
US19840574237 |
申请日期 |
1984.01.26 |
| 申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
DOREMUS, BERNARD |
| 分类号 |
E21B21/10;E21B34/00;F16K5/06;F16K39/06;(IPC1-7):F16K5/06;F16K39/00 |
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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