Stepping Actuator Operated

Stepping Actuator Operated

Generally linear Stepping Actuators use in choke valve. Linear Stepping Actuators produce linear movement as a series of discrete linear steps. Each increment of the excitation pulse sequence moves the actuator forward by a fixed linear displacement. The displacement can be accurately controlled by applying a measured number of steps.

There are two types of Stepping Actuator generally use for Choke Valve:

Stepping Actuator – Hydraulic

Actuator is coupled into a hydraulic system. Via a series of hydraulic controls and two directional solenoid valves oil is fed into one of two cylinders, which act upon a mechanical rat chat/gear wheel. The rotation of gear wheel is selected by giving an electrical pulse to one of the two solenoid valves. Linear motion is achieved via a drive nut, which is connected to the gear wheel. The drive nut will be connecting to valve stem.

Stepping Actuator – Pneumatic

Actuator is coupled into a pneumatic system. Via a series of pneumatic controls and two directional solenoid valves air is fed into one of two cylinders, which act upon a mechanical rat chat/gear wheel. The rotation of gear wheel is selected by giving an electrical pulse to one of the two solenoid valves. Linear motion is achieved via a drive nut, which is connected to the gear wheel. The drive nut will be connecting to valve stem.

Optional Extras are available with Actuator as per Customer requirement:

  • Electronic Actuator Position Controller – 24 VDC, 4-20 mA command & feedback signal.
  • Position Controller is ATEX EExd certified with HART, SMART or Foundation Fieldbus.
  • Position Indication – Rotary Potentiometer or alternatively Limit Switches up to four.
  • Electrical Enclosure – Copper Free Aluminium or Stainless Steel.
  • De-cluchable Hand Wheel for manual control.
  • Electronic position transmitter and controller with communication protocols – Analog, HART and Foundation Fieldbus with diagnosis features for configuration.
  • Fail conditions on the loss of signal failure and supply source failure – fail last.
  • Actuator operation from wellhead/production gas.
  • Instruments used with hydraulic actuated chokes are certified for all Hazardous Area locations around the globe