Answer / aftab ahmed mazari

Please check following things:
1. To loose gland packing, due to tight packing, valve may hunt.
2.Check leakage from diaphragm.
3.May be seat or plug loose
4. Check cut marks at feed back linkages.

Answer / gopalakrishnan.p

Kindly check the following thigs for betterment

1.Loop tune ur controller.(gain value,integral
time,derivative time).
2.Check the cable(connector side ..i,e may be loose
connection).

Answer / ashish namdev

Kindly check these following :-

1. first check positioner link spring.
2. adjust link assembly.
3. adjust instrument air at valve specified pressure
through AFR.
4. check all parameters and settings in positioner.
5. give auto calibration command and calibrate it.
6. Tune your controller.(gain, PID controlling)

Answer / abdul mannan

please check followings:
1-check gland packing if tight then may be loose.
2-If booster relay installed then check its equlizer valve
some time this valve called by-pass valve.The valve may
adjut to approprite position as hunting stop.
3-Check feed back linkage with touch any part of the body.

Answer / imran

First check its feedback link spring if it is ok then
checked its feedback potentiometer by removing it from
positioner with meter.these r main causes that already i
faced.

components of control circuit belongs to control valve

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