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6. Preventive Maintenance and Troubleshooting
♣ NOTE
Replace parts after inspection by referring to the Part Replacement Cycle Sheet in Section 5. For other parts,
replace them to prevent damages to other devices when they show a wearing sign.
6.1 Troubleshooting
Table 6.1 shows some remedies to general problems that may occur at the site while using ball valves. For
more serious problems, transport the system to the factory.
Table 6.1
Problem
Leak from Stem Packing
Excessive
internal
when the valve is blocked
(Seat)
The stroke time is delayed.
Leak from the connection
between body and body
cap
1. Fasten the packing flange. Check for leaking.
2. If you suspect any damage to the stem, go to item #3. Otherwise, replace
packing after taking all safety precautions at the site.
3. Disassemble the valve. Visually inspect the stem. Check whether the plug
components are damaged, and replace them if necessary. Also, replace
the gland packing.
1. Check the air pressure supplied to the valve.
leak
2. If you suspect any damage to ball or seat, go to item #3
3. Disassemble the valve. Visually check ball and seat for damages. Replace
them if any damage is found.
1. Check the air pressure supplied to the valve.
2. Check the pressure of the filter regulator.
3. Check the adjustment of accessories such as booster solenoid.
1. Remove pressure from the line and fasten the bolts connecting the body
and body cap.
2. Disassemble the valve and check the gasket.
Solution
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