| 发明名称 |
Non-return valve with built-in tool for rising-pipe hangers |
| 摘要 |
Hangers, where the non-return valve has packing which can be retightened independently of the fitting of the non-return valve via a key mounted on the built-in tool in such a way as to be longitudinally displaceable but not rotatable.
|
| 申请公布号 |
DE3151988(A1) |
申请公布日期 |
1983.07.07 |
| 申请号 |
DE19813151988 |
申请日期 |
1981.12.31 |
| 申请人 |
CELLER MASCHINENFABRIK GEBR.SCHAEFER |
发明人 |
LEVERMANN,HORST,DIPL.-ING.;TEEPE,STEPHAN,ING. |
| 分类号 |
E21B33/03;E21B33/068;E21B34/02;E21B34/14;(IPC1-7):E21B34/02 |
主分类号 |
E21B33/03 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
