| 摘要 |
The invention concerns a hydraulic valve arrangement with a control valve (3), which, in a first operating position (5), connects a motor connection (21) with a pump connection, in a second operating position (6), connects a motor connection with a tank connection, and, in a locking position (4), disconnects the motor connection (21) from the pump and tank connection. A locking valve (19) is coupled between the control valve (3) and the motor connection (21), dividing the motor line (22) into a first section (23) allocated to the control valve (3) and a second section (24) allocated to the motor connection (21). For the locking valve (19), a pressure release valve (20) in the shape of a seated valve is provided. The operating element (32) of said pressure release valve (20) is loaded in the closing direction by the pressure in the first section (23) and a spring (36) and in the opening direction by a constant control pressure (V) acting in dependence of the position of the control valve (3). When operated, the operating element (32) releases the pressure in a spring chamber (26), acting in the closing direction of the locking valve (19), to the first section (23). The seat of the pressure release valve (20) is fixed to the housing. This improves the control accuracy.
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