14 THE FLOW OF WATER UNDER PRESSURE . eylinder side of the valve , and do useful work in the machine . It has produced velocity at the expense of head . The potential … » - > » - Fig . 3 . energy thus lost is equivalent to the product of the weight of water and the height it would have to fall in order to acquire that velocity . The loss of pressure energy occasioned can be stated in terms of the respective velocities . If v represents the accelerated velocity ,…
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