Pneumatic Actuator Selection Guide
Choosing the right pneumatic actuator for butterfly valves requires aligning the actuator's capabilities with the valve's operational needs and surrounding conditions.
Torque Matching
- The actuator must generate enough torque to overcome the butterfly valve's resistance from media pressure and disc movement friction
- Underestimating torque may prevent full valve operation; oversizing increases energy use and component strain
- Consult valve manufacturer's specifications and select an actuator with a slight torque margin for wear or pressure spikes
Actuation Type
- Single-acting actuators use a spring for fail-safe operation—ideal for fluid systems where unchecked flow poses risks
- Double-acting actuators rely on air pressure for both opening and closing, offering consistent torque in both directions
- Choose based on whether fail-safe operation or continuous controlled operation is more critical
Environmental Conditions
- For moisture, dust, or corrosive substances, choose models with robust housing and corrosion-resistant coatings
- Select actuators with temperature-rated components for extreme temperature environments
- Outdoor installations require weatherproofing; indoor clean environments may allow standard designs
Material Compatibility
- Ensure actuator seals, O-rings, and housing materials are compatible with the fluid or gas flowing through the valve
- Food-grade applications require approved seals; aggressive chemicals demand inert materials like PTFE
- Mismatched materials can lead to leaks, seal failure, or contamination
Accessory Compatibility
- For precise flow control, select actuators compatible with modulating positioners
- Ensure compatibility with solenoid valves or control panels for automated systems
- Consult manufacturer's compatibility guides or specialists to avoid mismatched accessories
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