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Thread: Clattering pipes shower

  1. #1
    DIY Junior Member mrg65's Avatar
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    Jan 2013
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    Chapel Hill NC
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    Default Clattering pipes shower

    Hi, my first post:

    I have a Danze shower fixture in an upstairs bathroom. When the shower is in the warm position the pipes can make a knocking sound. Turn it to all hot, no knock... all cold, no knock. When knocking i can open the cold water in the nearby sink and the knock temporarily stops.

    I don't have the experience to know if this is a sign of air in the pipes, a bad mixing valve, or something else. Hopefully you all can help.

    Thanks,

    Mike

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    Feb 2011
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    NW Ontario, Canada
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    Default

    Quote Originally Posted by mrg65 View Post
    When knocking i can open the cold water in the nearby sink and the knock temporarily stops.
    When you do that, what is happening is the pressure balance spool valve is compensating for the drop in pressure on the cold side. That suggests that the spool valve is responsible. It is not necessarily defective, only that it has a particular point of resonance. You could try a different shower head with a different flow rate, or you could try replacing the valve.

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