What are pressure seals, and how do they work?
by FSA members Dick Dudman and Thom Jessup
October 22, 2013

Replacement

A shared problem for the aftermarket providers and OEMs is the replacement of a metal pressure seal gasket. Metal can become galled or welded to the valve body, which requires a jackhammer for removal. Then, once it is removed, the valve body must be re-machined to restore its ultra-smooth finish so that another metal seal can take its place.

Not so with a graphite gasket. First, it takes no more effort to remove a graphite gasket than it does to install it, and most damaged areas related to a metallic gasket operation and removal are accommodated by the graphitic gasket. When servicing a pressure seal valve, the valve surfaces rarely need to be re-machined when using a flexible graphite gasket.

Next Month: Do I really need to use a torque wrench?

We invite your suggestions for article topics as well as questions on sealing issues so we can better respond to the needs of the industry. Please direct your suggestions and questions to sealingsensequestions@fluidsealing.com.

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