White Papers

How To Prevent Galvanic Corrosion of Valve Stems




Learn how different metals react, and how corrosion inhibitors can help avoid downtime.

By Brittany Kelley, A.W. Chesterton

Valve packing is a necessity for plants trying to contain product and meet the latest emission requirements. However, finding a sealing product that works and has longevity can be a challenge.

Graphite-based packing can be a good choice for stem sealing when elevated temperature requirements are necessary. This is due to graphite’s ability to maintain its sealing properties at temperatures that cause polytetrafluoroethylene (PTFE) to break down and allow leaks to occur. However, graphite is not an electrical insulator like PTFE; graphite will act as a metal and undergo galvanic corrosion if the environment is right.

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