发明名称 |
PRESSURE SWITCH VALVE FOR HYDRAULIC STEPPING SUPPORT |
摘要 |
<p>A pressure-control valve is connected to a working cylinder of an hydraulic, walking, mine roof support on one side of the piston in the cylinder. In its function as a pressure-limiting valve, it regulates the pressure in the working cylinder in dependence upon a predetermined pressure in a control conduit which is connected to the pressure chamber of a prop of the mine roof support. Through it a spring-loaded control piston of the pressure-control valve is hydraulically loaded so as to act on a spring-loaded valve closure member in the pressure-control valve. The control piston holds the valve-closure member in the closure position if the pressure in the control conduit exceeds the predetermined pressure. If the pressure in the control conduit drops off, the valve-closure member then regulates the pressure in the working cylinder to a comparatively low value.</p> |
申请公布号 |
HU195989(B) |
申请公布日期 |
1988.08.29 |
申请号 |
HU19860000543 |
申请日期 |
1986.02.10 |
申请人 |
HERMANN HEMSCHEIDT MASCHINENFABRIK GMBH UND CO,DE |
发明人 |
KRIEGER,KARL,DE;REINELT,WERNER,DE |
分类号 |
E21D23/16;(IPC1-7):E21D23/16;F15B13/02 |
主分类号 |
E21D23/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|