Reply To: Knocking pipes

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#292950
johnws
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Is there a pressure reducing valve supplying the house? If there is, then is the pressure in the main supply (to the valve) less than the pressure the valve is trying to reduce to? eg. If the valve is set to 50psi and the supply pressure is only 45psi then you can get a knocking sound from the valve (some brands) when nothing is being used.

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