Neles® Series N1

High performance scotch yoke actuator. The Neles® scotch yoke N1 series actuator is designed for use with quarter turn valves in both modulating control and on-off service. The N1 actuator’s robust design ensures a long life in harsh environments due to unique features such as its internal tie-rod mechanism. This heavy duty actuator has all major approvals to meet industry standards and customer process requirements.

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  • Suitable for on/off, modulating and control valve applications in general service, protective service and safety applications ex. 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
  • Springs are non-buckling, lifetime lubricated and epoxy coated
  • Ball bearing, flexi joint and the hardened yoke thrust pin bearing are all incorporated into the actuator for longer lifetime, smoother operation


  • Solid bearing ensures better piston rod alignment and smooth 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
  • Modular design allows the flexibility of configuring the actuator in either CW or CCW / fail open or fail close functions


  • Emergency shutdown
  • Compressor anti-surge
  • High cycle control and on-off applications
  • High precision control


  • Type:     Pneumatic piston type quarter turn actuator. Spring return or double acting versions
  • Supply medium:               Air, natural gas (sweet), nitrogen
  • Design pressure:              12 barg (pressure retaining parts)
  • Torque range:    25 Nm – 176000 Nm
  • Temperature ranges: -20 °C … +80 °C normal, -20°…+125 °C high
  • Protection class: IP67 (IEC 60529)
  • ATEX class: Ex 2G IIC T6 / Ex 2D IIC T80C
  • Mounting face: ISO 5211, VDI/VDE 3845