Pneumatic Actuator Retrofit Guide
Technical considerations for manual valve automation
Mechanical Compatibility
Modern valves with ISO 5211 flanges allow direct actuator mounting. Non-standard valves require custom stainless steel/aluminum adapters rated for 100-500 N·m torque.
Stem diameter (e.g., 20mm) and keyway must match actuator output. Misalignment causes binding or stem damage.
Operational Requirements
Actuator torque must exceed valve requirement by 20-30% (e.g., 144-156 N·m for 120 N·m valve).
Double-acting: Simple retrofit. Spring-return: Adds fail-safe but needs 25% more torque capacity.
System Integration
Requires 6-8 bar compressor, filters, regulators, and solenoid valves. Older valves may need limit switches for position feedback.
Retrofit Challenges
| Challenge | Risk | Solution |
|---|---|---|
| Valve Strength | Cast iron may crack under cyclic loading | Verify ANSI pressure class |
| Space Constraints | Scotch yoke actuators too bulky | Use compact rack-and-pinion |
| Cost Analysis | Adapter costs may negate savings | 30-50% cheaper than full replacement |
If you want to learn more about low-priced products, please visit the following website: www.xm-valveactuator.com
