Pressure or volume hydraulic control system has a reversible pump rotor within a sliding housing to finely adjust the output to an actuator

摘要

The actuator (3) is fed with hydraulic oil by an electric motor driven pump impeller (6) inside a piston (1) whose axial position is determined by a control unit (5) and throttle valve (16) to alter the position of the rotor in the housing and hence the output.