Valve for controlling liquids e.g. for vehicle fuel injection system, has hydraulic chamber that transfers control piston movement to actuating piston, which is in hydraulic force equilibrium with valve element closed

摘要

The device has an especially piezoelectric actuator unit (20) for operating a valve element with at least one control piston and at least one actuation piston that operates a valve closure element that interacts with at least one valve seat (24) and separates a control bore from an outlet chamber in the closed position. A hydraulic chamber (18) between the pistons transfers movement of the control piston (19) to the actuating piston (16), which is essentially in hydraulic force equilibrium with the valve element closed.