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What is water hammer? Water hammer (or hydraulic shock) is themomentary increase in pressure, which occursin a water system when there is a suddenchange of direction or velocity of the water.When a rapidly closed valve suddenly stopswater flowing in a pipeline, pressure energy istransferred to the valve and pipe wall.ater hammer (or hydraulic shock) is themomentary increase in pressure, which occursin a water system when there is a suddenchange of direction or velocity of the water.When a rapidly closed valve suddenly stopswater flowing in a pipeline, pressure energy istransferred to the valve and pipe wall.
A water hammer is caused by fast-closing valves, like toilet fill valves and faucets. As the water flows through the pipes and the valve shuts off quickly, it causes the water to stop suddenly in the pipes, causing the hammer effect.