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Selection of actuator for regulating valves
abstract：In order to ensure the normal operation of the regulating valve, the actuator used should be able to generate sufficient output force to ensure high sealing and valve opening.
In order to ensure the normal operation of the regulating valve, the actuator used should be able to generate sufficient output force to ensure high sealing and valve opening.
For double acting pneumatic, hydraulic, and electric actuators, there is generally no return spring. The magnitude of the force is independent of its direction of operation, therefore, the key to selecting an actuator is to understand the larger output force and the rotational 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. Therefore, it is required to establish force balance throughout the entire opening range of the regulating valve.
Determination of the type of executing agency
After determining the output force of the actuator, select the corresponding actuator according to the requirements of the process usage environment. When there are explosion-proof requirements on site, pneumatic actuators should be selected. From the perspective of energy conservation, electric actuators should be selected as much as possible. If the adjustment accuracy is high, a hydraulic actuator can be selected. For example, speed regulation of power plant turbines, temperature regulation and control of catalytic reactors in refineries.
For double acting pneumatic, hydraulic, and electric actuators, there is generally no return spring. The magnitude of the force is independent of its direction of operation, therefore, the key to selecting an actuator is to understand the larger output force and the rotational 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. Therefore, it is required to establish force balance throughout the entire opening range of the regulating valve.
Determination of the type of executing agency
After determining the output force of the actuator, select the corresponding actuator according to the requirements of the process usage environment. When there are explosion-proof requirements on site, pneumatic actuators should be selected. From the perspective of energy conservation, electric actuators should be selected as much as possible. If the adjustment accuracy is high, a hydraulic actuator can be selected. For example, speed regulation of power plant turbines, temperature regulation and control of catalytic reactors in refineries.