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Resiliant Valve seat materials

Resiliant Valve seat materials

Resiliant Valve seat materials

(OP)
Can anyone tell me what the Maximum recommended pressures & temperatures are for continuous use for the following valve (ball or butterfly) seat  materials?

Nylon, PTFE, RPTFE, Devlon & PEEK

Are there any pressure / temperature tables available?
I know there are chemical compatability issues as well but, I have found charts for them whereas nothing on the press. temp issue.

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