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Thermoplastic Valves Product Guide & Engineering Specifictions
Ball Valve Troubleshooting Guide
Made in the U.S.A. Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Page 762
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True Union, Single Entry and Compact Ball Valves are designed and produced for trouble-free operation and use.
However, certain aspects of installation and application can result in valve malfunctions.
This guide identifies some of the more common problems encountered and their necessary corrective actions. Such problems
have been categorized as External Leaks, Internal Leaks, Frozen Movements and Structural Breakage.
External Leaks
Location Possible Cause
Corrective Action
At Thread/Socket
Connections
At Union Nuts
At Stem
Improper solvent cementing.
Improper threads.
Insufficient or improperly applied thread sealant;
incompatible sealant (paste).
Over-tightened thread joint splitting connector.
Insufficient valve support splitting connector.
End connector misaligned.
Displaced or damaged O-ring; particles in O-ring
groove.
System contraction pulling end connectors;
improper end connector spacing.
Loose Union Nut.
Displaced or pinched seal carrier O-ring.
Damaged stem O-ring.
Replace end connector(s) according to installation
instructions.
Check threads for proper size; replace or reinstall.
Reinstall thread connection according to proper
procedures; check paste compatibility.
Replace cracked end connector(s).
Replace cracked end connector(s). Add support on
each side of valve.
Check system alignment - end connector(s) must be
parallel. Check for adequate valve support.
Remove valve and inspect O-ring for physical or
chemical damage. Check O-ring compatibility,
replace accordingly. Clean and re-seat O-ring.
Check thermal variations; anchor pipe each side of
valve; install expansion loop. Correct spacing.
Re-tighten nut.
Remove and disassemble seal carrier; re-seat or
replace O-ring.
Remove and disassemble valve stem; inspect
for physical or chemical damage. Check O-ring
compatibility, clean and replace accordingly.