CindyJ
Member
Is that the flow through the showerhead? If you remove the showerhead how much flow do you get? If about the same, then the combined flow restriction of the valve and upstream piping is to blame.
Ask you plumber what part of the system would "blow" at 75 PSI? It is not unusual for city pressure to be higher than that and most places code only call for a pressure regulator above 80 PSI.
Yes, that was the flow through the showerhead. I'll have to wait until the weekend to test the flow without it.
I'll have to get clarification regarding what would blow at 75 PSI. He said something about water spraying out. I'll find out.