Noisy water pipes
#1

I read your question and answer on noisy water pipes. My pipes hammer for minutes. I've tried shutting off the water and allow the air to escape. If your remedy doesn't work, could it be a faulty pressure reducer value located at the main supply line?
#2

It could be the regulator, check the pressure at the house if 80lbs or above then replace or adjust it if you can
Best Regards Plumber2000
www.atozplumbing.com
Best Regards Plumber2000
www.atozplumbing.com