ASAHI AV VALVES Installation,Operation and Maintenance Manual
PDCPD Butterfly Valves 700-1200mm (28”-48”) 13
(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.
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.
(Refer to page 7)
The disc is damaged or worn. Replace the disc.
Fluid is not stopped in the full
closed position.
The connecting bolts are too much tightened
or tightened unevenly. Reset the valve. (Refer to page 7)
Fluid leaks to the outside. The seat is damaged or worn. Replace the seat.
Foreign matter is adhered. Reset the valve. (Refer to page 7)
The gearbox is damaged. Replace the gearbox.
The handle does not work
smoothly.
The connecting bolts are too much tightened. Reset the valve. (Refer to page 7)
The gearbox is damaged. Repair or replace.
The valve does not operate.
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.)
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