Valve Actuator Sizing Calculator
Size an actuator from the valve’s breakaway (BTO), running and end (ETO) torques. The tool takes the governing (highest) torque and applies your safety factor.
Method
Required actuator torque = max(BTO, running, ETO) × safety factor
Breakaway/seating torque usually governs for ball and butterfly valves.
Safety factor guide
| Service | SF |
|---|---|
| On-off, clean | 1.25 |
| Modulating | 1.3–1.5 |
| Critical isolation | 1.5–2.0 |
Frequently Asked Questions
How do I size a valve actuator?
Take the highest of the valve’s breakaway, running and end torques and multiply by a safety factor.
Which torque governs?
Usually breakaway/seating torque for quarter-turn valves; check all three.
What safety factor?
1.25 for clean on-off, more for dirty, modulating or safety-critical service.
Where do these torques come from?
The valve datasheet at your operating differential pressure.
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