VALVE  POSITIONER

VALVE POSITIONER CALIBRATION SET UP AND PROCEDURE / MAINT 1. INTRODUCTION OF VALVE POSITIONER The positioner  is  a  high-gain  plain  proportional  controller  which  measures  the  valve  stem position (to within 0.1 mm), Compares that measurement to its set point (the controller output signal),  and,  if  there  is  a  difference,  corrects  the  error  .The  open-loop  gain  …

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