High performance scotch yoke actuator


  • Suitable for on/off, modulating and control valve applications in general service, protective service and safety applications eg. ESD or HIPPS.
  • Ductile cast iron center body, fabricated carbon steel power and spring module provides rugged actuator construction. Alternative materials available upon request.
  • Suitable for safety integrated systems up to and including SIL 3 accordance with IEC 61508.
  • The vent valve has built in non-return function for IP67.
  • Secondary vent valve function is to detect leakages in the rod seal area of pneumatic cylinder.
  • Internally mounted hydraulic override.
  • Springs are non buckling, lifetime lubricated and epoxy coated.


  • Modular design allows the flexibility of configuring the actuator in either CW or CCW / fail open or fail close functions. In case of need an easy on-site modification can be done by interchanging the spring and pneumatic modules.
  • Solid bearing ensures better piston rod alignment and smooth operation.
  • Ball bearing, flexi joint and the hardened yoke thrust pin bearing are all incorporated into the actuator for longer life time, smoother operation.
  • The tie rods are enclosed in the cylinder providing highest corrosion protection and the best performance.
  • Full range of accessories: switchboxes, positioners, safety solenoids (ESD, PST) and customized control panels.
Technical specification


Pneumatic piston type quarter turn actuator
Spring return and double acting versions

Supply medium:

Air, natural gas (sweet), nitrogen

Design pressure:

12 barg (pressure retaining parts)

Temperature ranges:

-20 °C ... +80 °C, normal

Protection class:

IP66 and IP67 (IEC 60529)

ATEX class:

Ex 2G IIC T6 / Ex 2D IIC T80C

Mounting face:

ISO 5211, VDI/VDE 3845


Technical bulletin Download
Installation, maintenance and operation manual Download

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