Pneumatic Actuator Torque Analysis
Key factors determining torque output in rotary valve actuators
1. Pneumatic Pressure & Force
Torque ∝ supplied pressure. 100mm² piston generates 600N at 6 bar. 8-10 bar increases torque but requires stronger components.
50mm piston (1963mm²) produces 1178N at 6 bar - double the force of 35mm piston (962mm²).
2. Mechanical Design
Torque = Piston Force × Pinion Radius. 50mm pinion with 1000N force yields 50N·m.
100mm radius × 50mm width vane generates higher torque than smaller vanes.
| Component | Efficiency Impact |
|---|---|
| PTFE-coated pistons | 95% torque retention |
| Standard seals | 85-90% torque retention |
3. Actuator Configuration
20N·m spring reduces output by 20% (120N·m actuator needed for 100N·m load).
Variable torque: ±15% stroke peaks, 80-90% average of peak values.
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