I took some photos the other day and thought I'd upload em today. In case any of you guys have not seen the inside of your PRV, here's what they look like.
There is some variation, but they're essentially all like this. Pretty simple disassembly, just undo the fasteners, tap it a bit to break it loose.
Here's what it looks like inside. It's a spring loaded valve that opens with pressure and allows excess pressure to bleed off into the exhaust system. The CC system creates an abundance of water and pressure at speed, so this is a safety valve. At low speed, if this thing is held open by debris, they the intended level of water won't be getting to your motor block, thus the low speed overheating with a bad PRV.
Here's what the backside (spring side, or the "pressure side") looks like. Pretty simple, essentially lasts forever.
(see next post for followup, to not overload this one with large photos)
Regards, Paul