Humming pipes

[Troymm]

Hi everyone. I searched the site and found a lot of great info on my humming pipe problem, but heres what I have so far.

About a month ago, my pipes started with an occasional soft hum while the hot or cold water was running in the kitchen sink and upstairs shower. I could make it stop by slightly running another sink to releave the pressure. But it started to get louder and made noise with the other sinks, so I searched this forum for advice.

I bled the pipes, and the humming stopped for a couple of days, but it came back. I ran the water and while it was humming, I turned off each sink/toilet angle stop one by one, but it didn't stop the humming. I changed the PRV(set at 60psi) and I thought it was cured, but it again came back 2 days later.

Could it be a loose pipe in the wall? But if it is a loose pipe, would it stop after bleeding the pipes and come back? Could it be a bad washer in the shower? Any other suggestions?

[plumber1]

When it's happening, go to the toilets and shut the stop valves an see if the hum goes away.

[Cass]

Next time it happens go to the PRV and see if the sound is coming from there.

[Troymm]

I turned off the toilet one by one and that didn't help. Also, the sound isn't coming from the PRV.

[Troymm]

So last night, the humming was very bad. But around 2:00 am I heard a gurgling in the pipes and now this morning there is nothing.