MOST ENGINEERS are more familiar with centrifugal pumps than positive displacement pumps. In many cases, however, positive displacement pumps, particularly rotary variants, can provide the most cost-effective and efficient fluid handling. That's because, unlike centrifugal pumps, which create pressure, positive displacement pumps create flow. In a centrifugal pump, an impeller rotates to move liquid through the process. The impeller's velocity imparts energy on the fluid. The resulting rise in pressure, or head, is proportional to the velocity of the liquid.
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