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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.
Leaking Fluid. Inside every shock and strut is a piston and hydraulic fluid. When you drive over a bump or a rough stretch of road, the shocks or struts compress, causing the piston to push against the hydraulic fluid, which absorbs the force of the piston. Sometimes that fluid that can leak out of the shock or strut.