Selection Of Control Valve Actuator

In order to make the regulating valve work normally, the equipped actuator must be able to produce enough output force to ensure a high degree of sealing and valve opening.

For double-acting pneumatic, hydraulic and electric actuators, there is generally no return spring. The magnitude of the force has nothing to do with its running direction. Therefore, the key to selecting an actuator is to understand the maximum output force and the rotating torque of the motor. For single-acting pneumatic actuators, the output force is related to the opening of the valve, and the force appearing on the regulating valve will also affect the motion characteristics, so it is required to establish a force balance across the opening range of the regulating valve.

Determination of the type of actuator

After determining the output power of the actuator, select the corresponding actuator according to the requirements of the process environment. For explosion-proof requirements on site, pneumatic actuators should be used. From the perspective of energy saving, electric actuators should be used as much as possible. If the adjustment accuracy is high, hydraulic actuators can be selected. Such as speed regulation of turbines in power plants, temperature regulation and control of reactors in catalytic units of oil refineries, etc.