Why hunting will occour in control valve?
Answers were Sorted based on User's Feedback
Answer / 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.
Is This Answer Correct ? | 57 Yes | 1 No |
Answer / kumar
1)I/P PROBLEM
2)INSTRUMENT AIR LEAK(Signal)
4)FLOW DISCHARGE FROM THE PUMP MAY FLUCTUATING.
Is This Answer Correct ? | 15 Yes | 2 No |
Answer / mahesh kumar
Hunting Occur in theControl Valves due to inproper tuning
of PID loop, to remove thr hunting & for smooth operation
Tune the PID loop by adjusting the Gains
Is This Answer Correct ? | 17 Yes | 7 No |
Answer / sam.r
An undesirable oscillation of appreciable magnitude,
prolonged after external stimuli disappear. hunting is the
evidence of operation at or near the stability limit.
in control valves is caused by the oscillation in the
loading pressure to the actuator caused by the instability
in the control system or the valve positioner .
Is This Answer Correct ? | 5 Yes | 2 No |
Answer / sujitkumarnaik@indiatimes
if there is haunting in c/v that means there is disturbance
in i/p signal & o/p signal or feed back.so firstly calibate
it n observe.if still same prob. coming,adjust the pid tunning.
Is This Answer Correct ? | 4 Yes | 3 No |
Answer / 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
Is This Answer Correct ? | 1 Yes | 0 No |
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