Double Acting Actuator Sizing

Sizing Double Acting Pneumatic Actuators is the simplest actuator to size. You only have to worry about air supply and break torque.


Follow these steps to find the appropriate actuator size.

  1. Determine the MINIMUM operating pressure. (This is the lowest air supply available)
  2. Determine the torque required to operate the valve. For safety, always increase the torque to provide a safety factor. (torque x 1.25)
  3. Select which actuator you will be using. (Rack and PinionScotch YokeVaneManual, etc.)
  4. Obtain the torque charts for the actuator being used. (For this explanation we will use the Rack and Pinion torque charts from Triac Actuators to the right.)
  5. Find your minimum operating pressure column.
  6. Follow the column down until the torque is greater than your valve break torque. (Refer to step 2 for safety factor)

For example:

My valve has a break torque of 1000 in lbs and I have a minimum air supply of 80psi. I will take 1000 x 1.25 = 1250. Then I will look under 80psi on the chart to find the smallest available actuator with a greater torque out put. In this case, the 2R2200DA puts out 1431 in lbs of torque.


* All directions are for informational purposes and actuators sizing should be verified with an engineer prior to installation.