The banging sound and pressure shock that occurs in pipes when water flow is suddenly stopped — like when a washing machine valve closes.
A pressure surge or shock wave caused when a fluid in motion is suddenly forced to stop or change direction, often heard as a loud banging noise in pipes. Water hammer occurs when quick-closing valves, solenoid valves, or washing machine fill valves abruptly stop water flow. It can damage pipes, fittings, and appliances over time and is prevented by air chambers or water hammer arrestors.
Water hammer arrestors were installed at the washing machine valves to eliminate the banging that occurred every time the cycle changed.
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