ASAHI AV VALVES Installation Operation and Maintenance Manual
Butterfly Valves Type57L-IS (Lug style) 17
(12) Troubleshooting
Phenomenon Cause Treatment
Fluid is not stopped in the full
closed position at the seat.
1) The stopper is not set correctly.
2) The seat is damaged or worn.
3) Foreign materials are caught.
4) The disc is damaged or worn.
5) The connecting bolts are over tightened or
tightened unevenly.
Adjust the stopper.
Replace the seat.
Clean it up.
Replace the disc.
Adjust and retighten.
Fluid leaks to the outside.
1) The seat is damaged or worn.
2) The connecting bolts are not tightened in
proper torque or evenly.
Replace the seat.
Adjust and retighten.
The handle does not work
smoothly.
1) Foreign materials have adhered.
2) The gear box is damaged.
3) The connecting bolt is over tightened.
Clean it up.
Repair or replace.
Adjust and retighten.
Valve does not operate
1) The gear box is damaged
2) The stem is damaged.
Repair or replace.
Replace the stem.
(13) Handling of residual and waste materials
- Make sure to consult a waste treatment dealer for recommendations on the proper disposal of plastic
valves. (Poisonous gas is generated when the valve is burned improperly.)
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