[dtemple70]

When the shower is running and someone turns on any tap or flushes any toilet in the house, the shower pipes begin to vibrate making a pulsating knocking kind of noise. The showers have the water regulators and the shower water controls are the single dial turning type. So usually we turn the dial half way so that it's not cold, nor hot, but warm. This is usually when the vibrating also happens. Then if we turn the dial to cold (or hot) then slowly back to the middle for warm, the vibrating stops (sometimes). And again if someone uses any tap or toilet, it starts vibrating again.

The house is 3 years new and we can't remember when it really started. We think it may be the water pressure needs to be adjusted somewhere, but we're not sure. Any help would be truly appreciated.

I just installed a Danze shower unit with valve model D113000BT and I'm having the same problem with pulsating and knocking when someone uses the sink. I pulled the valve apart and checked for debris and there was nothing. Could it be that the spring in the diverter is not strong enough? Please help, Darrell

[doug238]

Speedball gave advice on a similar post previously, try what he said... [reposting speedball post]... Pull the tank lid and check the water leve when the tank's fulll. It should be 1/2 inch below the white overflow tube. If the water level's correct then leave the tank top off and watch the float ball while someone turn on a cold water faucet and then shuts it off real fast. Did the float ball bob up and down and the ballcock make a noise? I want you to test the house pressure and let me know. Regards, Tom
__________________
speedball1 is a veteran expert from AskMe.com.

[dtemple70]

The problem is actually in the shower, not the toilet. When I turn on the shower, with the single handle in the middle position for warm, and then turn on the cold or hot water in the sink, the pulsating knocking starts...

[speedball1]

Sounds like you picked up some trash off your pipe walls when you installed the valve. Open up the valve and flush out the supplies and valve body. Let us know. Regards, Tom

[dtemple70]

I opened up the valve and found that the flat washer on the cold check valve had broken apart. I replaced both washers on the valves and I thought I had found the problem but then after I flushed everything and put it back together, the pulsating continues to happen when the sink is used. I did notice that when the shower is off and I turn on the hot or cold on the sink and quickly turn it off, there is noticeable bang in the pipes in the shower area. I should add that when I plumbed the sink and tub, I went from the existing half inch copper to half inch pex using the new shark bite fittings. Could this be part of the problem? I hope not, I'm stumped. Thanks, Darrell

[doug238]

Have you checked the toilet yet?

[dtemple70]

I'm sorry Doug, I misunderstood your first response, I'll try the toilet test...

[dtemple70]

The toilet test proved negative. Any other suggestions, anyone?