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I have a problem with a valve (air to close).
When it is fully closed and try to open 1% it doesn't responce till 3% open suddenly more than 3% then back to 3%.
I tried to tune positioner then removed it, the problem still exist.
Any idea
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Answer Posted / praveen kumar
first decoupled the actuator then ensure and mark on the stem of full opening and closing, then couple the actuator stem and plug on fully 100 % open of marking position. finally to ensure zero passing test.just close the control valve and fil the water on bonnet inlet.same passing tht u feel means place the nut or iron piece something inb/w the coupling.then ensure again on zero passing test.if again feel the passing means pls to do lapping on seating...then take an trail.
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