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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.
It sounds like a shock wave just went though your pipes! Well, in fact one just did. Water hammer can damage your pluming system. The shock wave that created the water hammer is traveling at thousands of feet per second and exerts pressures at hundreds of pounds per inch.lder homes have (or should have) what is called an air chamber located on each hot and cold water line at or near each faucet or water inlet valve. The purpose of the air chamber is to act like a shock absorber for water when it is flowing at high speed under pressure.