Dear Pavis,
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.
Regards,
andy
As far as I know, the type of seat ring for trim 16 includes 1)threaded renewable seat ring, 2)Seal-welded seat ring, 3)intergal seat.
I can not understand your second sentence, but I hope my answer is helpful to your question.