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Should a water arrestor be banging?

View the thread, titled "Should a water arrestor be banging?" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi, I had a problem with water hammer where the pipes in my house would bang every time I turned a tap off quickly.

I called a plumber and he advised fitting a water arrestor, which I'd heard about after looking the problem up online, so I agreed and had one fitted.

The banging sound has gone when I turn the taps off but I now get it when I turn them on. There's a noticeable BANG from the arrestor whenever a tap is opened quickly. I asked the plumber about it and they said it's just the arrestor working and it takes the bang when the taps are turned on so I won't get it when they're turned off.

Is it normal for a water arrestor to bang like this?
 
The pressure inside the arrestor needs to be set slightly lower than the incoming water supply to take up the expansion and contraction ?? It won't cure badly fitted pipe noise. Kop
 

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king of pipes,
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