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. thats my plan i still need to do some more research to figure some things out......dont give up and slap a turbo on give it a go its not as expensive as the turbo option and the sc14 will give you a nice linear curve from idle up .To test the new tuning parameters, I usually operate the compressor with some recycle and as much safety margin as I can reasonably get away with. I check first that the parameters allow the controller to remain on the setpoint without obviously increasing oscillations or the like. If something looks wrong, change the values back and think again.

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