Knocking is Louder

[eaglesclaw121]

We have ver loud knocking noises, particularly when the toilet flushes and a faucet is opened at the same time. I have tried, twice, turning off the main water valve and opening up the line. Nothing has worked. Any idea what is wrong?

 

[phishfood]

There are a few different things that could be causing this problem.

Let's start with a defective pressure reducing valve. Do you have one of these on your water main?

It could also be a loose washer in the main shutoff valve, if it is not a ball or gate valve.

 

[eaglesclaw121]

Yes, we have a pressure reducing valve - I was under the mistaken impression that was the shut off valve - I turned it off and drained the air from the pipes. I'm assuming that did nothing of value, correct?

 

[johnjh2o]

If you used the PRV valve to turn off your water I'm sure it's out of adjustment. I would get a pressure gauge to check your pressure. If it's to high your not doing your system any good. It should be set to be between 50-60 PSI.

John

 

[eaglesclaw121]

I am sure you are right. Where would I get a gauge and how would I check it?

 

[johnjh2o]

You can get one at one of big box stores that will connect to your outside faucet.

John

 

[eaglesclaw121]

Sorry for all the questions. Our pressure valve is in our laundry room on the lower level. I have looked everywhere but can't find the shut off valve. Is it normally near the pressure valve?

 

[johnjh2o]

It should be were your water line enters the home, before anything is connected to it.


John