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How to Fix a Leaking Ball Valve

author: ATHENA GROUP
2026-10-16
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How to Fix a Leaking Ball Valve: Ball valve leakage is one of the most frequent problems encountered in oil & gas, chemical and pipeline systems. The troubleshooting solution depends on identifying the exact leak point before any maintenance work.


Safety Precaution First


Always isolate the pipeline, shut off the media supply and fully depressurize the system before inspection or repair. For hazardous fluid, gas or high-temperature service, follow site safety specifications. Never perform maintenance on pressurized valves. When working through How to Fix a Leaking Ball Valve, always adhere to these safety rules.


1. Leakage at pipe / flange connections


Loose fittings or aged gaskets are the main causes.
  • Threaded ends: Disconnect the joint, clean old sealant, wrap PTFE tape properly and reassemble with moderate torque.
  • Flanged ends: Replace damaged gaskets and retighten flange bolts in cross sequence to avoid uneven compression.

2. Stem leakage (leaking around handle)


This usually comes from worn packing or O-rings.
1.Remove the handle assembly.
2.Tighten the packing gland nut incrementally (1/8 ~1/4 turn each time). Do not over-tighten, which may jam the stem.
3.If weeping continues, replace the PTFE packing or stem O-ring. Clean the stuffing box and reinstall new sealing components.
4.Reassemble the handle and test under pressure.

Technician inspecting ball valve
3. Internal seat leakage (media still passes through even when fully closed)


This happens when debris is trapped between ball and seats, or the ball surface / seat rings get scratched, corroded or deformed.
  • Minor case: Flush pipeline to remove impurities.
  • Severe damage: Replace valve seats or the whole ball valve. Deep scratches on ball surface cannot be fixed on site.

Key Reminder


For API 6D industrial ball valves used in critical process lines, only qualified technicians should carry out disassembly and seal replacement. Improper repair may cause fugitive emission and safety risks. Regular inspection and preventive maintenance can greatly extend valve service life. Following the guidance for How to Fix a Leaking Ball Valve will help avoid incorrect repairs.
For reliable industrial ball valves and professional valve technical support, please turn to Athena Valve. Visit our official website: www.athenavalve.com

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