LIQUID CONTROL VALVE

摘要

Disclosed is a valve (2) for controlling liquids, comprising an especially piezo-electric actuator unit (4) which is used to actuate a valve member arrangement (5) consisting of at least one first piston (8) and a second piston (9) between which a hydraulic chamber (11) is arranged. The valve member arrangement (5) actuates a valve closing member (10) which co-operates with at least one valve seat (12). An intermediate piston (17) is arranged between the second piston (9) and the valve closing member (10), said intermediate piston having a smaller diameter than the second piston (9). The end of the intermediate piston (17) facing the valve closing member (10) and an end of the first piston (8) facing the piezo-electric actuator unit (4) are adjacent to a system pressure area (14). A transition area between the second piston (9) and the intermediate piston (17) is disposed in a region (18) where the pressure thereof is lower than the pressure of the system pressure area (14).