We are purchasing a pressure seal bonnet gate valve in CF8C body with Trim 17. The vendor is providing segmental retainer in A182 Gr F6, they are insisting that since the retainer has to bear heavy thrust, F6 is the best material to go with. The gasket support ring (below segmental retainer) is in SS347. I have apprehensions about the corrosion of segmental retainer fitted in SS347 body.
I would like to know if F6 is an acceptable material.
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