Pump-controlled electro-hydraulic actuator for valve

The pump control electro-hydraulic actuator comprises a motor pump control unit, a servo motor, a two-way hydraulic pump, a first pressurization oil tank, an actuating cylinder and a rotating mechanism, the rotating mechanism is in linkage with a controlled valve, the actuating cylinder is installed on the rotating mechanism and comprises a piston rod, the piston rod is connected with the rotating mechanism, and the two-way hydraulic pump is installed on the piston rod. Extension or retraction of the piston rod can drive the rotating mechanism to rotate, the motor pump control unit is mounted on the rotating mechanism and comprises a motor pump control unit valve block, a servo motor and a bidirectional hydraulic pump, the first pressurizing oil tank is fixed to the motor pump control unit valve block, and the bidirectional hydraulic pump is driven by the servo motor to control extension or retraction of the piston rod. The first pressurizing oil tank provides hydraulic oil for stretching or retracting of the