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Answer Posted / s vedpathak
Control valve is used in close loop control system.If it is
hunting , then to troublshoot first put loop for few sec in
manual mode, still if v/v is hunting then it is field
problem i.e v/v or I/P converter problem.
If it is not hunting in manual mode, then the problem can
be either the loop process variable(PV) is hunting or if PV
is ok, either the load/process is varied or loop needs
tuning.
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