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General Plumbing and Gasfitting Talk => Plumbing => Ask Plumbers (Public) => Topic started by: Paul on September 14, 2008, 01:05:45 PM

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Title: Banging pipes
Post by: Paul on September 14, 2008, 01:05:45 PM

I just had my ballcock valve replaced on my hot water cyliver header tank. Now when I use hot water the pipes start to make a pulsing banging sound. What is causing this problem?

Title: Re: Banging pipes
Post by: Plumber on September 15, 2008, 07:19:56 PM

Hi Paul,

It almost sounds like the wrong ballcock was installed. There are two kinds, one that can shut off gradually and the other that cant. So this is what I think is happening: when using water your headertank is being filled at the same time and your ballcock is trying to shut off but cant as long as the tank is not completely full so it bangs. I think a different ballcock (long lever) that shuts off gradually as the water level in the header tank rises should do the job. Here's a link that shows you the differences. http://www.plumbworld.co.uk/ball-cocks-346-0000 (http://www.plumbworld.co.uk/ball-cocks-346-0000)