water hammer

the concussion and accompanying noise that result when a volume of water moving in a pipe suddenly stops or loses momentum.


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World English Dictionary
water hammer
a sharp concussion produced when the flow of water in a pipe is suddenly blocked

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If you are installing a dishwasher or a clothes washer, you must install a
  water hammer arrestor on the water lines.
Fill at the specified rate requirements to remove entrapped air and prevent
  water hammer surges.
Discuss water hammer and ways that it can be caused.
Care must be taken to minimize condensate backup, which can lower steam quality
  and increase the potential for water hammer.
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