32 year old house. Recently replaced water pressure reducing valve due to random loud rattling periodically near the valve. Unfortunately I am still getting periodic rattling although the duration is not as long or as frequent. I have successfully set the inside pressure to 60psi. The real mystery is the rattling can happen even in the dead of night when no one is using any fixtures so there is no sudden closing of valves. My only theory is could it be possible that there are spikes coming in from the city that are such that they somehow blow past the water pressure reducing valve which in turn somehow causes the rattling? If that's not possible what else do I look for? Its just weird because I replaced the pressure valve because it was old< I was getting the rattling and I was unable to adjust the valve to bring inside pressure to below 90psi. Since replacing it I do now maintain the safer pressure but still get this rattling. I have checked the brackets holding the pipes close to the studs as well.The rattling is a high rapid fire rattling like a machine gun. Hope I have provided enough info for you to help.

Don

Still thinking on your rattle but your current pressure is still too high, try around 45 psi

It can be water main shut-off valve, and/or any other device installed in front of the house...

On that note, I would like to also say that the source of the noise doesn't have to be where you hear it. It can be located somewhere inside the house and vibrations transfers to the front of the house, where it is audible

Turn OFF and back ON all angle stops in your house. See if the noise continiues

Back to you

Milo

Thanks Milo... when you say turn off and then on all angle stops what are you referring to? What is an angle stop? So I take it you think that my theory may have some merit about the city supply coming to the house being higher than usual? The site of the meter under the sidewalk is only about 25 feet from where it comes into the house under the frost line. The water pressure reducing valve in the house is only 2 or 3 feet above where the water comes in the house. Like I said earlier the only thing I can think of is there are periodic spikes so high in the water from the city that it somehow blows through the reducing valve and causes the rattling. Is that possible?

Angle stops are valves under each sink and under each toilet where water supply connectors attach and supply water to faucets and toilet tanks. These angle stops have interior parts that will eventually get loose and will rattle when water is open in proximity of the valve. By closing and opening them, you will change position of that interior part and that will (hopefully) stop the rattle

Rattle can also occur when toilet fill valve ( located inside the tank ) slowly, and periodically, releases water to the tank.

Try to investigate further. See if it happens at specific time or when specific plumbing fixture is in use.

I don't think it is result of "high water pressure spikes". Pressure regulator should take care of such. As suggested above, try to lower your pressure a bit. Suggested operating pressure for all plumbing fixtures inside your house should be not higher than 55 PSI.

Hope that helps

Milo