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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 (hydraulic shock) is by far the loudest and most common plumbing noise problem in the home. You hear it in a home having high water flow rates (around 10 feet per second) when a faucet or water valve is shut off quickly.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.