Quote Originally Posted by frank View Post
I know CPR as Crankcase Pressure Regulator. Use to prevent excess pressure returning to the compressor
Commercial systems use "CPR" as you have stated, while industrial systems would use the term "outlet pressure regulator."

Interestingly, transcritical CO2 systems have what amounts to a CPR, but they refer to it as a flash tank.

Lots of jargon in this industry...

MrFreez717