Stepper Motor Actuator

SM series has two actuators, hydraulic (SM/H) or pneumatic (SM/P), driving the stepper motor internal mechanism (clockwise and anticlockwise rotation), thus allowing the linear movement of the valve threaded stem in closing or opening direction.

This actuator is tipically mounted on choke valves.


  • Available in different sizes to meet different torque requirements
  • Available with two 3-way solenoid valve and other accessories
  • Direct connection between position transmitter and valve stem without intermediate mechanism
  • Linear and visible stroke indicator
  • Manual override detachable/attachable (user defined)
  • Manual override provided in case of loss of mechanism forces

Technical data

Operating pressure

70 bar to 250 bar (oil)

4 bar to 10 bar (air)

Standard operating temperature

-20°C to 70°C

(lower or higher temperature on request)

Standard supply medium

Oil, instrument air

Output torque

Up to 400 Nm


Up to 8" (200mm)

Internal mechanism

15 step / turn

Contact us for more information