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Introduction of electro-hydraulic servo valve
  • 03 Sep, 2021
  • Posts by : Raiseway
Introduction of electro-hydraulic servo valve
Electro-hydraulic servo valve is an automatic control valve. It is not only an electro-hydraulic conversion component, but also a power amplifier component. Its function is to convert low-power analog electrical signal input to change with the size and polarity of the electrical signal, and respond quickly High-power hydraulic energy [flow (or) and pressure] output, so as to realize the control of the displacement (or rotation speed), speed (or angular velocity), acceleration (or angular acceleration) and force (or torque) of the hydraulic actuator. Electro-hydraulic servo valves are usually composed of electrical-mechanical converters and hydraulic amplifiers.
The electrical-mechanical converter includes two functions: current-force conversion and force-displacement conversion.
A typical electrical-mechanical converter is a force motor or a torque motor. A force motor is a linear motion electrical-mechanical converter, while a torque motor is an electrical-mechanical converter of rotational motion. The function of the force motor and the torque motor is to convert the input control current signal into an output force or torque proportional to the current, and then the elastic component (spring tube, spring sheet, etc.) is converted into a linear displacement or rotation angle that drives the pilot valve movement. , Make the pilot stage valve position and return to zero. Generally, the input current of a force motor is 150-300mA, and the output force is 3-5N. The input current of the torque motor is 10~30mA, and the output torque is 0.02~0.06N·m. The electrical-mechanical converter used in the servo valve has two structures: moving coil and moving iron

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