| 摘要 |
A single-prop valve, in the housing of which are integrated a non-return valve for setting, a check valve for clearing, and a pressure-limiting valve to protect the prop against overloading, is provided for use in underground single-prop workings. The valve housing of the pressure-limiting valve is moved hydraulically, in that the housing is also equipped on the clearing side with a coupler that has a locking groove and a catch projection. A slide pin that is appropriately loaded by hydraulic pressure acts on the valve housing and moves this by a preset amount so that the check valve is opened by this and the hydraulic fluid can flow from the interior of the prop through the suction pump connector that is arranged on the setting side. Here, the channels and chambers are so dimensioned that an increased quantity of hydraulic fluid can drain off, this procedure being enhanced by a pump that is connected to the suction pump connector.
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