Installation,Operation and Maintenance Manual
Butterfly Valve Type 58 700mm (28”)
12
(11) Troubleshooting
Problem
Cause
Treatment
The valve does not operate
smoothly.
The protrusion of the seat. The uneven or
excessive tightening of the bolt.
Loosen the bolt and adjust.
Fluid is not stopped in the full
closed position.
The stopper is not adjusted properly.
Adjuster the stopper.
The seat is damaged or worn.
Replace the seat.
Foreign matter is in the valve.
Disassemble the valve and clean.
The disc is damaged or worn.
Replace the disc.
The connecting bolts are too much tightened
or tightened unevenly.
Reset the valve.
Fluid leaks to the outside.
The seat is damaged or worn.
Replace the seat.
The handle does not work
smoothly.
Foreign matter is adhered.
Reset the valve.
The gearbox is damaged.
Replace the gearbox.
The connecting bolts are too much tightened.
Reset the valve.
The valve does not operate.
The gearbox is damaged.
Repair or replace.
The stem is damaged.
Replace the stem.
(12) 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.)
Warning
