Flowzone Engineering Solution

Neles™ heavy duty scotch yoke actuator, series N1

Neles has developed the N1 series scotch yoke actuator, which is ideal for operating quarter turn valves in modulating control and on-off service. Its tough construction is equipped with exclusive elements like an internal tie-rod mechanism that ensures extended lifespan even in challenging conditions. This sturdy actuator has received all the necessary approvals to fulfill both industry standards and customers’ process needs.

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  • 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


  • 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
  • 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 life time, smoother operation


Pneumatic piston type quarter turn actuator
Spring return or double acting versions
Supply medium:
Air, natural gas (sweet), nitrogen
Torque range:
25 Nm – 218765 Nm @ 4 bar, max up to 700000 Nm
Temperature ranges:
-20 … +80 °C normal, -20…+125 °C high
Protection class:
IP66M/IP67M (IEC 60529)
ATEX class:
Ex 2G IIC T6 / Ex 2D IIC T80C
Mounting face:
ISO 5211, VDI/VDE 3845


  • Technical bulletins
  • Installation, maintenance and operation manuals
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