[RAY BUCKNER]

Resilient seat butterfly and pinch valves–gasket or no gasket?

[James Pennock]

Ray,
There is a wide range of “Lined” valves.
See here:
http://ptfeindia.com/ptfe-lined-valves/

In my opinion the addition of a Gasket is not required and in fact may be counter productive. Example, the use of a spiral wound Flexatalic Gasket in addition to the lining may damage that primary lining.

[Author]

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