From GAWDAwiki
A positioner positions a valve by comparing the input signal with a mechanical feedback link from the actuator. It then produces the needed force to move the actuator output until the mechanical output position feedback corresponds with the pneumatic signal value. Positioners can also modify the valve's action (reverse acting positioner), alter the stroke or controller input signal (split range positioner), increase the pressure to the valve actuator (amplifying positioner) or alter the control valve flow characteristic (characterized positioner).[1]
References
- http://www.maintenanceresources.com/referencelibrary/controlvalves/cashcoterminologypg1.htm
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