Is a CS body valve with 10mm corrosion allowance readily available for all pressure classes or if they need to be specially manufacturered? Or is the 10m corrosion allowance OTT (over the top) The following valve elastomers specifications, are they correct w.r.t. to the application temperature limitations: PTFE shall be limited to 230 deg C, Viton A to 200 deg C, Buna N to 120 deg C and Neoprene to 90 deg C If you expect 10mm corrosion in CS you would be well advised to look at a different, corrosion-resistant, alloy. You're not saving money if the valve corrodes so much that it cannot perform its intended function and your products are out of specs. It's not economical either if the ball valve blows and shuts the process down, or worse: if somebody is injured and you have to pay a bajillion dollars to his family and the cost of a cleanup for the spill. The temperatures you listed look to be about right for those elastomers. Viton can get really hot for a short period of time.

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