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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.
Freebase(0.00 / 0 votes)Rate this definition: Water hammer. Water hammer is a pressure surge or wave caused when a fluid in motion is forced to stop or change direction suddenly. Water hammer commonly occurs when a valve closes suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe. It's also called hydraulic shock.