发明名称 |
VALVE UNITS FOR USE IN HYDRAULIC CONTROL SYSTEMS OF MINING EQUIPMENT |
摘要 |
A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of an appliance such as a prop. A auxiliary valve is mounted in the block and is operated manually to relieve the working chamber even if the non-return valve remains closed.
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申请公布号 |
US5159872(A) |
申请公布日期 |
1992.11.03 |
申请号 |
US19910682986 |
申请日期 |
1991.04.10 |
申请人 |
GEWERKSCHAFT EISENHUTTE WESTFALIA GMBH |
发明人 |
DETTMERS, MICHAEL;PETERS, BERND |
分类号 |
E21D15/51;F15B13/01 |
主分类号 |
E21D15/51 |
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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