Fluid control valve e.g. for common rail injector of motor vehicle combustion engine, has size of pressure pin set by amount of pressurized fluid flowing via return channel

摘要

A valve for controlling a fluid, has at least one piezoelectric actuator unit (20) and associated adjustment piston (26) and an actuating piston (30) associated with a valve closure member (32), between which lie pistons of a hydraulic chamber, which is used for maintaining a systems pressure via a pressure pin boring (52). In the hydraulic chamber (28), the system pressure (p-sys) is adjustable by locating the pressure pin (50) into the location pin boring (52).