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banging pipes?

pipes are banging furiously only when hot taps are turned on and off. i have clipped all the pipes and fitted a pressure release valve to no avail. the banging seems to be coming from upstairs
jacky from pontypool, April 2009
when pipes are banging check ballvalve in the loft and by touching it it noice should stop than replace ballvalve part 2 in the cold water tank

Mr K, April 2009