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Thread: leaky backflow preventer & high water pressure

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  1. #1

    Question leaky backflow preventer & high water pressure

    I have a one zone water heating system
    thathas a backflow preventer that is constantly leaking water out of
    the vent, should I remove it and replace it??? also could that be the
    reason why my water pressure is at 30psi?? I'm afraid to turn on the
    heating system with the water pressure being that high.....
    any suggestions????????????

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Default heat

    An automatic fill valve regulates the "cold" pressure in the system. A relief valve relieves any pressure over 30 psi. An expansion tank absorbs pressure buildup as the water heats. And a backflow preventer, if you have a separate one keeps the water from entering your domestic water system. All of these items are interrelated so the failure of any one can cause symptoms from the others.

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