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The O series has been discontinued.
It has been replaced by the P series.

O Series Repair Kits Are Still Available Here


O Series Pneumatic Valve Actuators

The Assured Automation O Series pneumatic actuators offer a simple and cost effective solution for your valve automation needs. For use on quarter turn (90 degree) ball valves, plug valves, dampers, and resilient seated butterfly valves.

These are dual scotch yoke style actuators which have higher torque values at the start and end of the stroke. This characteristic makes them ideal for use on resilient seated butterfly valves. This also makes them suitable for valves and applications requiring a higher break torque.


Dual Scotch Yoke Design

Features & Benefits

  • CISQ Certified
  • High duty cycle-life
  • Direct mounting to ball and butterfly valves
  • DIN/ISO 5211 DIN 3337 (FO3 to F16)
  • Square and Diamond Output Drive
  • Visual Position Indicator
  • Permanent Lubrication
  • Corrosion Resistant Coating
  • NAMUR Solenoid and Limit Switch Mounting

Typical Applications

  • Ball valves
  • Plug valves
  • Resilient seated butterfly valves
  • Dampers



  • Housing: Aluminum alloy with corrosion resistant coating
  • End Caps: Painted aluminum alloy
  • Mounting/Shaft: Stainless steel
Direct Mount Connections
  • ISO 5211
  • Female drive shaft connection
Service Life
  • up to 1 million cycles
Temperature Range:
  • -4°F to 176°F (with dry air as control media)
  • 32°F to 176°F
Supply Pressure:
  • Minimum (see sizing charts)
  • Maximum 112 psig
Torque Output:
  • 60 to 25,600 in/lbs. (with 80 psi control supply)
Control Media:
  • Dry, filtered compressed air, not necessarily lubricated. Any lubrication used must be NBR compatible.
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Please contact us to verify any information that is critical to your application.