Double Acting Actuator Sizing Guide
For Butterfly Valve Applications
1Determine Valve Operational Torque
Static Torque: Base torque + 20-30% for high-pressure systems (e.g. 100Nm → 130Nm at 10 bar)
Dynamic Torque: Calculate using Cv coefficient for turbulent flow (e.g. +50Nm in wastewater)
2Apply Safety Factor
200Nm requirement → 250-300Nm actuator (25-50% margin)
Harsh environments use 50% margin
3Match Actuator Torque Output
100Nm @ 6 bar → 167Nm @ 10 bar (rack-and-pinion example)
300Nm @ 8 bar requirement → verify manufacturer torque curves
4Physical Dimensions
ISO 5211 flange mismatch causes premature wear
5Environmental Factors
10,000 cycles/year requires polyurethane seals
6Manufacturer Verification
Request CAD models and torque curves (e.g. Emerson CSI™)
Common Pitfalls
Systematic torque calculation, safety margins, and environmental consideration ensure optimal actuator performance for butterfly valves.
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