Valve actuator is a device for operating and connecting valve. The device can be driven by power source of electric power, air pressure, hydraulic pressure or other combination, and its motion process can be controlled by the stroke, torque or axial thrust. Because the actuator working characteristics and utilization rate depend on the valve type, the working specifications, and the position of the valve on the pipeline or equipment. Therefore, the correct choice of valve actuator device is closely related to the valve type and technical parameters. The basis for proper valve drive selection is:

1. Valve type, specification and structure.

2. Valve torque (pipeline pressure, maximum pressure difference of the valve), thrust.

3. Maximum environment temperature and fluid temperature.

4. Working way and working times.

5. Speed and time of opening and closing.

6. Stem diameter, pitch, and direction of rotation.

7. Connection method.

8. Power source parameters: electric power supply voltage, phase number, frequency; pneumatic air source pressure; hydraulic medium pressure.

9. Special considerations: low temperature, anti-corrosion, explosion-proof, waterproof, fire-proof, radiation-proof, etc.

The general principle for the correct selection of a valve actuator device is that the operating characteristics should be consistent with the operating characteristics of the valve. For general or non-automatic valves, manual drive is optional; for valves that require quick opening and closing, pneumatic or airdraulic drive is required; for valves that require automatic control or remote control, electric actuator is optional; On the flammable and explosive pipelines, if an electric actuator is selected, an explosion-proof electric drive actuator is required.