Australian Pipeline Valve - Installation, Operation and Maintenance Manual
15
FLOATING BALL VALVES - BV100 SERIES
4. The gland packing and gasket should be replaced preferably each time the valve is disassembled.
5. To reassemble body and cap, each bolt and nut shall be pre greased and then tightened in accordance
with applicable Torque as per Table 1 (see Appendix).
6. After installation of new parts:
Reassemble using reverse order of steps outlined above. Operate valve several times to be
assured of smooth operation before reinstalling.
TROUBLESHOOTING
MALFUNCTION
POSSIBLE CAUSE
REMEDIAL ACTION
Valve does not rotate
or operate
1. Packing is dropped too tightly.
2. The stem is torn or there is dirt.
3. The times of on-off operation are too
many or dirt exists on the surface of the
ball.
1. Loosen nuts and adjust again.
2. Pull apart the valve and clean the dirt.
Ball/Seat Leaking
1. Valve not full closed.
2. Seat or ball damaged
3. Debris trapped in valve.
1. Close the valve tightly
2. Replace seat or ball.
3. Clean the debris.
Stem Packing
Leaking
1. Gland bolts loose.
2. Packing damaged or missing.
3. Seal misaligned
1. Tighten gland bolts.
2. Replace packing (shut down first).
3. Replace and align it correctly.
Body Gasket Leaking 1. Body bolts loose.
2. Body gasket damaged.
1. Tighten body bolts.
2. Replace the gasket.
Note
Nylon and Devlon are hard and more scratch resistant compared to Teflon®, and
PEEK is harder still. However, Teflon® is more resilient and has better ‘memory’ in
terms of resistance to permanent indentations. All soft seated valves are only suited
to clean service applications.
