Water Hammer
Water hammer is caused by quick closing valves,solenoid valves,faulty and loose jumper valves unclipped pipework. A shock wave is generated at the face of a quick closing valve or solenoid because an incompressible column of water moving under pressure is stopped suddenly.
The shock wave ricochets back from the face of the valve, through the stationary column of water at a speed of up to 4200ft/second.Copper and other metallic piping systems tend to highlight the existence of water hammer by noise whereas plastics hide it. Preventing water hammer can be as simple as replacing loose jumper valves or a process of installing a water hammer arrester, or installing a pressure limiting valve at the point of entry to the household supply.
