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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.
Water hammer is a complex process of formation of elastic deformations in a liquid and their propagation through a tube. If the pressure rise is very great, the impact can cause damage. Safety devices (equalizing reservoirs, air domes, valves, and so on) are installed in pipelines to prevent such damage.