Enter the valve’s rated/measured operating torque (from the datasheet) and a safety factor to get the required actuator output torque.
Method
Use the valve’s maximum operating torque (usually breakaway/seating). A safety factor of 1.25–1.5 covers wear, friction and pressure variation.
Typical safety factors
| Service | Safety factor |
|---|---|
| Clean, on-off | 1.25 |
| Modulating / control | 1.3–1.5 |
| Dirty / critical isolation | 1.5–2.0 |
Frequently Asked Questions
How do I size a valve actuator?
Take the valve’s maximum operating torque and multiply by a safety factor (1.25–1.5), then pick an actuator rated above that.
Where do I get the valve torque?
From the valve manufacturer’s datasheet at your operating pressure; request it if not listed.
What safety factor should I use?
1.25 for clean on-off service, higher for dirty, modulating or safety-critical valves.
Does this include packing torque?
Use the valve’s total operating torque, which already includes seating and packing friction.
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