I have asked this in the Material forum but, I am not sure whether it is better to ask the Q here.
Can anyone tell me what the Maximum recommended pressures & temperatures are for continuous use for the following valve (ball or butterfly valve) seat  materials?

The pressure/temperature ratings for a material generate a reasonably complex curve.  The rating for a part is not only determined by a material but by how it is designed and supported in the assembly.  One globe valve manufacturer has PTFE seats rated for 6000 psi, due to some clever design. OTOH: I wouln't trust a PTFE Faucet washer at 100 psi. If you have a specific valve in mind it would be best to consult the literature for that product. 

At these sizes, pressures and temperatures I would ask for a reference list of where they have supplied like valves before.  You definately want to be sure that they have done something similar in the past...

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