| 摘要 |
<p>The controller has a shift valve (200) in which a valve slide (210) is slidable along a longitudinal axis for closing a pressure chamber or for connecting the pressure chamber with another pressure chamber or with an actuator in different shifting positions. A locking device (250) locks the valve slide in one of the engaged shifting positions during power failure, where actuation of the locking device is hydraulically effective. The locking device is detachable before displacement of the valve slide for executing a shifting process, and comprises a locking piston (251) and a spring (255).</p> |
