| 摘要 |
A pressure-control valve (1) comprises a first control piston (1), which is disposed between a first pressure chamber (6), which adjoins the first control piston (1) and is connected to at least one working line (A, B), and a second pressure chamber (7), which adjoins the first control piston (1) and is pushed against a stop (3) by a first preloading spring (4). A throttle (8) connects the first pressure chamber (6) and the second pressure chamber (7). The second pressure chamber (7) is connected to a second control piston (11), which is preloaded by a second preloading spring (17) and which, when a predetermined pressure in the second pressure chamber (7) is exceeded, is displaced to an extent such that a control edge (12) of the second control piston (11) clears a connection of the second pressure chamber (7) to a hydraulic fluid discharge point (23). The first control piston (1) comprises a control edge (2) which connects an actuating pressure line (5) to a hydraulic fluid discharge point (23) when the first control piston (1) is displaced against the first preloading spring (4). An actuator (15), which is regulated by a control signal, presses onto the second control piston (11) against the second preloading spring (17).
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