| 摘要 |
In order to increase the pressure of the hydraulic medium in cylinders, especially those of the hydraulic longwall construction used in underground mining and tunnel construction, a control unit 21 is used which has suitably controllable, releasable check valves 29, 30 and 25 , as well as a blockable check valve 31 . These check valves and the associated directional valves create the possibility of filling both the cylinder space 20 proper and the piston rod cavity 26 , which enables the pressure adjustment process with hydraulic medium in a specific manner, or accordingly their discharge, with no risk of reciprocal influence, seizing, or other damage.
|
