| 发明名称 |
PRESSURE REVERSING VALVE FOR PERCUSSIVE DRILLING APPARATUS |
| 摘要 |
A pressure sensitive valve (200) for a fluid-actuated percussive drill (10) includes passageways (44) for fluid flow to expose a valve surface to a burst of short-interval, high pressure fluid from a drive chamber (36) to cause early closing of the valve (200). |
| 申请公布号 |
WO9420725(A1) |
申请公布日期 |
1994.09.15 |
| 申请号 |
WO1994US01252 |
申请日期 |
1994.02.03 |
| 申请人 |
INGERSOLL-RAND COMPANY |
发明人 |
FU, CHUEN-CHENG;LAY, WARREN, T. |
| 分类号 |
E21B4/00;B25D9/14;E21B4/14;(IPC1-7):E21B4/00 |
主分类号 |
E21B4/00 |
| 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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