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The Westlock P-10 pneumatic positioner accepts variable pneumatic instrumentation signals (typically between three and 15 psig) and regulates the 80-psi air supply to the actuator via a characterized cam, diaphragm and spool. The diaphragm receives an input pressure signal from the controller, which applies force to the spool valve spring, causing the spool valve to move. This movement modifies the air pressure to the actuator, permitting the actuator to respond accordingly. The characterized cam transmits the actuator movement to the spool valve.
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