Answer Posted / mostafa abo el-kasem
Several reasons can cause valve hunting; it can be from signal or from hard ware
To define:
1- Check controller o/p is stable while valve “you can put it in manual mode” is hunting or not (if not stable then it could be from the configuration or from PV change, you can check transmitter/damping/configuration,)
2- If signal is ok ,then it will be hardware problem from
a. Feedback arm not fixed
b. I/P problem
c. Diaphragm damage
d. Flow irregularities
e. Positioner tuning
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