During operation, a pneumatic valve positioner recognizes the signal given by the controller and outputs air pressure; this allows for great precision in the alignment of the valve’s position, in conjunction with an actuator.
Such a pneumatic servo is used as a component in process control systems to improve operating characteristics of valves by reducing hysteresis. Pneumatic valve positioners communicate with air (i.e. 4-20mA input, and pneumatic-air output). Digital valve actuators use a microprocessor to monitor the valve accurately.
Click on the images below for detailed information on the poisitioners that Switches International has on offer.
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