Quarter-Turn Pneumatic Actuators for Butterfly Valves
Quarter-turn pneumatic actuators are well-suited to control butterfly valves, as both operate on a 90-degree rotational movement, making them inherently compatible.
1. Mechanical Compatibility
- Butterfly valves require precise 90-degree rotation to open/close, matching the actuator's stroke
- Most actuators feature standardized mounting flanges that align with butterfly valve stems
- Ensures easy installation without modifications
2. Torque Requirements
- Actuators must deliver sufficient torque to overcome the valve's disc resistance
- Especially important in high-pressure systems
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Example requirements:
Large butterfly valves in water treatment may need 200–500 Nm
Smaller valves (DN50) require 50–100 Nm
A 20% torque margin prevents stalling
3. Control Flexibility
- Single-acting actuators (spring-return) offer fail-safe closure during air loss
- Ideal for critical applications like chemical processing
- Double-acting models provide faster cycling
- Suitable for frequent flow adjustments in HVAC or wastewater systems
4. Application Advantages
- Compact design fits space-constrained areas where butterfly valves are common
- Pneumatic actuation ensures quick response times
- Critical for regulating flow in dynamic systems
5. Considerations
- Verify actuator materials resist media corrosion
- For high-temperature applications, select heat-resistant seals
- Maintain performance and prevent leaks
Always consult with manufacturers for specific application requirements and environmental conditions.
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