Re: High water pressure - new PRV and water expansion tank - still high
You didn't say that you tried adjusting the pressure regulator. Unscrewing the adjustment screw should lower the pressure; have a faucet open slightly when adjusting or you won't see the pressure drip.
(BTW, the term 'PRV' usually means Pressure Relief Valve, which rather than regulating pressure opens to relieve excess pressure.)
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.