So - maybe I need to get a life but just to confirm an engineering question that's been keeping me up at night. I'm looking at dynamic o ring materials, sizes and use in piston regs specifically and I have a question for the guys smarter than me.
I suppose it's more about the back up rings than the actual o rings . .
Back Up Ring Purpose: To fill the extrusion gap but why do we never consider them for replacement when rebuilding piston type regs. Do you guys just confirm nominal / gauge fit and validate them based on visual inspection? ( no obvious signs of excessive wear or damage)
Also - do they have a dual purpose in limiting spiral damage to the dynamic o rings due to the very slow and very small amount of axial travel they see within the bore during operation.
Thanks