Plumbing : PRV & Expansion tank related
Had plumber replace outside waterline to 3/4 copper recently & also new PRV was installed. After that work I am having pressure issues.
Outside pressure is typically 180-200 psi.
PRV is set at 50 psi (default)
For the 75 Gallon hot water heater, there is a 2 gallon expansion tank. Open line pressure (set pressure) is 50psi.
Inside home pressure gauge readings:
when faucets running - ~46 psi
after faucets closed - 50 psi
after 1-0-15 mins - 55 psi
after couple of hours - 70-80psi - during this time having issues like thud sounds during toilet flush, high force water from faucet etc.
what could be the issue? I suspected expansion tank but after turning off inlet supply & let faucets run out, the psi shows 50psi & no water leaks from the nozzle.
Note: Last year had similar issue, replaced PRV and the leaking expansion tank and issue was resolved.