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when the operation engineer told you that he gives the
control valve order to open but there is no response !
what will you do ?
and if you found that there is astuck , what will you do ?
(note : it is apanumatic valve )
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Answer Posted / chitturi bhaskara rao
1.First measure 4-20mA in field side if cannot get 4-20
then check AO card , if u got 4-20 in field side then check
positioner ,
2. make sure thatt sufficent air supply i,e 3 to 4 bar at
inlet of positinoer.
3.If all correct still valve nvr moves then remove
positionner from the valve and supply the air directly to
actuator ( to 4 bar max) then valve moves smoothly then
check angle of postioner while ur fixing positoner on
control valve .
4 if valve nvr moves smoothly means in side valve jam need
to send over haul
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