HYDROPNEUMATIC || Stepping Actuators for wellheads, drilling, water injection, gas lift, blowdown, production, header

HYDROPNEUMATIC | Wellhead Equipment & Controls

Stepping Actuators

for wellheads, drilling, water injection, gas lift, blowdown, production, header

  • 50 years of experience in Oil & Gas, 50 years of design and production

Stepping Actuators

The S range stepping actuator, available for pneumatic (PN) and hydraulic (HY) control fluid, has a highly reliable design for remote control and automation of production chokes. The Model S-90 actuator steps in 36° increments for opening and closing the choke valve. This is accomplished by a pawl - with a special cam and spring system - and a drive spool arrangement that directly drives the choke stem coupling. The pawl is extended to contact and rotate the drive spool member. This provides a constant loading force to produce the required torque output. The pawl and piston are designed for positive spring return to ensure that each cycle stroke is consistent. The pawl is always disengaged retracted to allow for reverse or manual operation at any time. Manual operation is easily obtained by means of the hex shaft on top of the actuator where the HW can be coupled. Any rotation of this shaft will directly drive the choke stem opened or closed.

Download the data sheet


The Model S stepping actuator is equipped standard with a 5 kΩ potentiometer and a 4-20mA transmitter for remote feedback of choke position.; the position transmitter can be customized upon request with specific brands and accessories. An optional limit switch module is available to directly sense the 4-20mA signal to control the open and close solenoids.
This module can be adjusted to any set-point within the choke stem travel.
If required, solenoid valves can be supplied and installed at the factory with specific bracket on the actuator side.

Features & Benefits

  • Pneumatic supply at 80 psi to 120 psi maximum
  • Hydraulic supply at 1,500 psi to 3,000 psi maximum
  • Side visual position indicator
  • Manual override by means of a hex shaft to be coupled with a dedicated HW
  • Fail-safe last position
  • Water tight housing with corrosion resistant coating
  • Wiring junction box
  • Field-tested


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