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ID Cards

Pneumatic Positioners

All regulating type actuators are integrally mounted with a highly sensitive pneumatic positioner that sets the piston position accurately with reference to the pneumatic input signal. The positioner is suitable for direct or reverse loading. Change of direction can be easily obtained by reversing the air supply connections and reversal of the mounting of the cam.

Positioner Models:-

  • KJ-Class - 1A
  • CLASS -2, 3, 4 & 5 

The positioner includes:

    • A balance beam
    • A bellow applying to the balance beam a force proportional to the pneumatic input signal
    • A positioning spring applying a variable load to balance the beam through a cam and linkage.
    • An inter-changeable cam related to the stroke of the actuator and making possible any characteristics between actuator position and pneumatic input signal.
    • A pilot valve producing a pneumatic control signal related to the balance of forces applied to the beam. Owning to the pilot valve, actuator position is in direct relationship to pneumatic input signal.
      Four types of pilot valves, class 2,3,4 and 5 are available to select the actuator response speed. Pilot valves class 2 and 3 are for standard application while class 4 and 5 meet special requirements.
Cam selection:
The positioner is supplied with one cam only. On request it can be supplied with a set of three cams  (A, B, C or A ½, B ½, C ½ ), making possible desired relationship between pneumatic input signal and regulating device position. Moreover cams may easily be shaped to match exactly the actuator characteristics with the control system requirements. A cam can be mounted on both sides.