Home > Product > Ball Valve > Ball Valve Installation & Maintenance > Ball Valve Leakage Prevention & Repair
Even the best-quality ball valves can develop leaks if not properly installed, maintained, or selected for the right media. Whether you’re dealing with a dripping stem, leaky threads, or internal bypass, this guide will help you understand why ball valves leak—and most importantly, how to prevent and repair those leaks effectively.
At Perfect Engineers, we supply industrial-grade ball valves built to minimize failure, but we also believe in empowering our customers with troubleshooting know-how.
| Leak Type | Location | Possible Cause |
|---|---|---|
| Stem Leak | Around handle or packing | Worn-out O-rings or loose gland nut |
| Body Leak | Between valve body parts | Gasket failure or bolt loosening |
| End Connection Leak | Threaded/flanged connections | Improper sealing, misalignment |
| Internal Leak | Through the valve (when shut) | Worn seat, scratched ball, debris stuck |
Symptoms: Leak around the handle or stem
Fix:
Symptoms: Leak from threads or flange area
Fix:
Retighten bolts using diagonal sequence
Symptoms: Media bypasses the valve even when closed
Fix:
Symptoms: Dripping from body or weld line
Fix:
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We manufacture valves with:
No. Always depressurize the system before attempting any repair or tightening.
Most likely due to:
Sometimes, yes. If it’s debris or scale buildup. But if the seat or ball is damaged, replacement is necessary.
Follow a routine maintenance schedule, use compatible materials, and don’t force the valve open/closed.
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