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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
Pressure Rise Following Instantaneous Closure. The pressure rise at the valve. Let the initial pipe velocity be. where. At the instant that the valve is closed a pressure wave, moving at the speed of sound sets off up the pipe bringing the water to rest. Consider the instant shown above, secs after valve closure. At this moment the length of the column brought to rest is.