noun

• A knocking noise in a water pipe that occurs when a tap is turned off briskly.

  ‘a paddle fitted to the arm of the ball valve will also prevent water hammer’

  More example sentences

  • ‘The sprinkler's closed-case design protects internal parts from debris contamination, while a steady piston valve guards against water hammer, pressure spikes and damage to the overall system.’
  • ‘If eliminating water hammer from an older house, locating the offending valve or faucet and installing a water arrester at that location is one solution.’
  • ‘Since installation I have had water hammer when the pump shuts off.’