Understanding Pneumatic Valve Positioners

The function of a positioner is to manoeuvre a control valve; the valve is moved to a particular position. Positioners are used to maintain certain parameters such as temperature, flow and pressure. A pneumatic valve positioner is a type of positioner that is used with a control valve.

Pneumatic valve positioners are commonly utilised with pneumatic piston actuators. The control valve sends out a signal which is received by the pneumatic valve positioner. Upon receiving the signal, the positioner releases air pressure; this allows for great precision in the alignment of the valve’s position, in conjunction with an actuator.

Pneumatic valve positioners are mainly used in the oil & gas and manufacturing industries.


Functions of pneumatic valve positioners

Pneumatic valve positioners are used for the following reasons:

  • They boost the resolution of control systems.
  • They facilitate operation when the number in the actuator bench-set range is higher than 15psig.
  • They enable the use of characteristic cams in rotary valves.
  • They lessen the effects of valve stem packing friction.
  • They assist in reducing seating friction in rotary valves.
  • They enable distances between controllers and controller valves.


Switches International offers a wide range of positioners. Contact us today for details on our pneumatic valve positioners.

About Switches International

Our company has vast experience embedded in it’s dedicated sales and technical staff. Our product lines extend to Proximity sensors, Valve Indication, Pressure sensors/switches, Rotary/Linear encoders, PhotoCell systems, Change-over switches, Speed, Temperature, Flow and Level sensors.

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