thank u so much amshah
: Make sure that u put your controller in manual and check, if your valve does not hunt then need to tune control loop. If u put your controller in manual mode and valve hunting remains then 1) check air pressure setting through AFR. w.r.t to actuator requirement 2) Check any leakage in air tubings /pipings or from actuators 3) provide lubricating and greacing on stem make sure your gland packing is not providing friction to stem, loose gland follower nut (slightly).
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