Hydraulic Valves M-OO-G D661-4651 D661-4008 D661-4033 D661-4577C D661-4577C/G45HOAA4VSX2HA G35JOAA6VSX2HA

Typical MOOG servo valve is composed of permanent magnet torque motor, nozzle, baffle, valve element, valve sleeve and control chamber. When the input coil is connected to the current servo valve, the baffle moves to the right to strengthen the throttling effect of the right nozzle, reduce the flow and increase the right back pressure; At the same time, the throttling effect of the left nozzle decreases, the flow increases, and the left back pressure decreases. The force on both ends of the valve core loses balance, and the valve core moves to the left. High pressure oil flows from S to C2 to the load. The load return oil flows through the return port through C1 and enters the oil tank. The displacement of the valve core is in direct proportion to the input current of the torque motor. The hydraulic pressure acting on the valve core is balanced with the spring force. Therefore, the differential current of the torque motor is in direct proportion to the displacement of the valve core under the balanced state. If the input current is reversed, the flow is also reversed.

Classification of electrohydraulic servo valve:

1. According to the stages of hydraulic amplification, it can be divided into single-stage electro-hydraulic servo valve, two-stage electro-hydraulic servo valve and three-stage electro-hydraulic servo valve;

2. According to the structure of the hydraulic front stage, it can be divided into single nozzle baffle type, double nozzle baffle type, slide valve type, jet pipe type and deflector jet type;

3. According to the feedback form, it can be divided into position feedback type, load pressure feedback type, load flow feedback type and electric feedback type;

4. According to the electromechanical conversion device, it can be divided into moving iron type and moving coil type;

5. It can be divided into flow servo valve and pressure control servo valve according to the output form