Do any body knows about type of seat in Trim 16 is renewable or integral type, in my opinion the both type are possible but the our Client is telling in trim 16 valves(API Cast Steel Valves) we have only integral type and he is refering to Table 8 of API 600 which is in it for Seat Surface Typical Specification Grade is written N/A and Client is telling that means the renewable seat is not applicable and just intyegral seat is possible, I know this is not correct but I couldn't find where the type of seat is refeered to type of trim specificly and strictly, can any body help me?I guess you client want to buy stainless steel valves made of 316L? When the material of the trim is as same as the body of the valves, intergral seat is the common practise.If we are discussing a 316 stainless steel valve most manufactures would provide a solid 316 valve with a integral seat ring that has a stellite overlay on it.I've never been fond of the "renewable" terminology because what does that mean? You can go in and lap any metal seated valve to some extent to "renew" the seats regardless if the seats are integral or not. So does this make all metal seated valves "renewable"?

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