If a control valve is hunting means means if we are giving
50% to the cv, the cv will open at 51% then slowly slwoly
it will reaches 49% , then it will reaches again 50%, this
type of action occured frequntly.. so what to do for solve
this problem. The possible cause is in volume booster or
positioner's relay.. positioner is double acting .. and
make siemens..sipart.The cv is double acting and mounted
for anti surge operation, it having 4 nos. volume booster,
one sov, one positioner, etc..?
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Answer Posted / aftab ahmed mazari
Check the following items:
1. Any loose connection or leakage of pneumatic signal.
Check all tube fittings with soap solution.
2.Check the gland packing should not be so tight. If feel
tight, get loose them a bit.
3. Check the pneumatic relays of Postioner. Get clean its
ports, nozzle, flapper etc.
4. Also check, that linkage, feed back mechanical link
should not have any dent, grove, burs etc.
aftabmazari@yahoo.com
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