Suggest a good source to guide in the design of a gas control valve trim (plug and seat) set? I must comply with NACE MR0175. Abscott gave you all the good poop about material hardness. Please, Please don't specify the valve from a molecular level. It is so easy to specify something nobody makes that way, so you will either get no bids or finance an R&D project if you do that. Specify the valve you need, then specify that the materials must be in conformance with NACE MR0175. Then evaluate what the vendors offer and pick what you think will work best. Delta hardness between plug and seat in a globe valve is not usually required, but it is required between the stem and guiding surfaces. The plug should not rub against the seat, just be compressed avainst it. Galling only happens with sliding contact.

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