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 / jigaranadkat
There can be may issues :
1) Very first indication is that your plug and seat are having some foreign particles or uneven surface which is restricting the valve for initial opening.
2) Check the springs of the actuator for any crack as when pressure is increased it lifts the valve.
3) Check for positioner relay.
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