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Faulty ball valve?

Hello
I'm useless at anything that involves plumbing but can someone advise me? There is a noise that appears to be coming from the loft which then rattles through the cold water pipes then the upstairs toilet partially flushes. It's quite noisy. Help!
Walker, June 2009
Sounds like ''mains hammer' try reducing the water pressure to the tank valve.

Bob, June 2009