The selection of a valve actuator should consider the valve type, operating conditions, and control system compatibility. Below are the key selection criteria:
1. Actuator Type Selection
1.Drive Mechanism
Electric Actuators: Suitable for precise control and remote operation. Must match the valve's torque, stroke, and speed requirements.
Pneumatic Actuators: Ideal for fast action or harsh environments. Calculate the required output torque (recommended as 1.2–1.5 times the valve's maximum torque).
- Hydraulic Actuators: Used for high-pressure differential or high-torque applications.
- 2.Motion Type
- Rotary Actuators: Suitable for quarter-turn valves (e.g., ball valves, butterfly valves).
- Linear Actuators: Match the linear motion requirements of gate valves or globe valves.
2. Key Performance Parameters
- 1. Output Torque
- Must exceed the valve's maximum operating torque, with additional margin to account for wear or contamination.
- 2. Stroke & Speed
- Stroke must match the valve's opening/closing angle; speed should meet process timing requirements (e.g., emergency shutoff requires fast response).
- 3. Stem Diameter
- For rising-stem valves, ensure the stem diameter does not exceed the actuator's allowable range.
3. Environmental & Compatibility Factors
- 1. Protection Rating
- Outdoor or corrosive environments require IP65 or higher protection.
- 2.Control Signals
- Must support standard protocols such as 4–20mA, Modbus, etc., for system integration.
4. Special Operating Conditions
- High-Pressure Systems: Actuators must have high-strength sealing.
- Regulating Applications: High-precision positioning and repeatability are required (e.g., 3610RSC-50 model with 4–20mA feedback).
- For optimal selection, consult manufacturer catalogs or request customized solutions to ensure compatibility with actual requirements.