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Thread: Installed a new Shower/Tub valve, and now have a water thumping. Any suggestions?

  1. #1
    DIY Junior Member Mundyz's Avatar
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    Default Installed a new Shower/Tub valve, and now have a water thumping. Any suggestions?

    We are in the middle of installing a new tub. The tub install required a new tub/shower valve height. It is about 10.5" higher up than the old install to make room for the new taller tub. The hot and cold line come straight from the basement, and feed this bathroom, and an adjacent bathroom. After installing the new valve, and turning the water back on, we are noticing a thumping noise coming from the hot water line when the sink faucet was turned on in the adjacent bathroom.

    When installing the valve, we cut the existing lines going to the old valve, soldered elbows on them to direct the water up to the new valve location. No other modifications have been made.

    The shower valve in the other bathroom is above this new tub/shower valve, and there are air chambers above that (about 20" of 3/4" pipe extending above the shower valve). Basically the main lines from the basement are 3/4" lines, and they have caps soldered on top of them.

    We have turned off the house water, drained all of lines, and turned the water supply back on. We then turned on both hot and cold water at each faucet starting with the stuff closest to the main water supply, and working our way up. After about 4 on and off pulls from the adjacent sink (hot water only) the main hot water line near the new valve thumps.

    What do you suppose is going on, and how do we fix it? Any suggestions would be greatly appreciated.

    Attached is a picture of the new valve for reference, and I can provide any sort of drawings if that helps solve it.

    Thank youName:  bathroom-valve.jpg
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  2. #2
    DIY Senior Member Smooky's Avatar
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    First make sure the stops are turned on all the way under that sink.

  3. #3
    DIY Junior Member Mundyz's Avatar
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    Hi Smooky,
    Thank you for the reply. I just checked the stops on that sink, and they are turned all the way on.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    FWIW, the air chambers are mostly useless, they eventually end up becoming full of water. If you need them, and most shower valves don't (if they do, they'll indicate that in their installation manual), then you should use an engineered arrester.

    When you turn the water off, until all of the air in the system is flushed out, it can make some sounds. Also, some crud could have been flushed loose, and it can clog aerators, maybe partially plug valves or filter screens in various valves.

    Toilet fill valves tend to be one source of thumps, especially if they get some crud broken loose, so you might try isolating it by shutting the valve off to see. If that's it, some can be cleaned and flushed fairly easily.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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