What are the possible causes and solutions for ball valve internal leakage?

Common causes:

Wear or scratches on the valve seat (the medium contains particles).

Deformation of the ball (used at high temperature or overpressure).

Aging of the seal ring (the rubber or PTFE material has expired).

Solution:

Disassemble and inspect the valve seat and ball surface, and replace damaged parts.

Choose a more durable sealing material (such as metal seals for high temperatures).

Clean the pipeline before installation to prevent welding slag from entering the valve cavity.