We have a butterfly valve with 6" 2500# Flanges. A working pressure of 3080 psig, a differential pres of 700 psi. Materials are 316SS. How do I determine the minimum class rating for the stem and bushing inside the valve? If you could point me to the right standard or provide guidance I would appreciate it. The working fluid is Nitrogen.If the valve meets B16.34, which I am guessing it does, the stem arrangement would need to at a minimum meet the pressure rating of the valve.

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