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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 â The Causes and Effects. Water hammer occurs in installations where sudden closure of a valve causes water to surge back and forth at supersonic speeds. Due to this phenomenon, the reservoir end of the pipe reflects negatively whereas the valve end reflects positively causing pressure to fluctuate rapidly.