Foghorn sound after install of PRV
New to the forum, so thanks to any replies. I'm in Arizona and last week on Thursday I had a plumber come and install 1) a new electric water heater and 2) a pressure reducing valve (watts x65b). The PRV was installed on the 1" line outside where it comes into the house. There is now the PRV, new shut off ball valve, t to house and other side to hose bibb (old). The pressure was above 80psi before the prv and the prv came pre-set at 50psi. All was fine for first 12 hours but late at night when turning on a faucet in the bathroom a foghorn sound was evident while faucet was on. It got worse the next morning. If flushing or showering no sound, only when opening a single faucet. If opening two faucets at one time then only sound when opening and closing. I called the plumber and talked him into coming and replacing the PRV. All was well for about 24 hours, then the same routine started. Now the plumber has talked with his boss and wants to come change out my toilet fill valves, if it stops the problem I will have to pay $125, if it doesn't then I don't have to pay. I've recently changed both valves.