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How can I fix hammer knock in plumbing?

I have plumbed my house , before I had coventional boiler which I had renewed to Vailant combi. I get hammer knock when taps are shut quickly. Do I need to add any device in plumbing to reduce this noise? Any help will be appreciated.
Bob Sudra, January 2012
you can install device call mini - Rester to you main water supply to boiler available from plumbing shop

ltd, January 2012