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


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?

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