Power consumed by the pump is plotted against different flow rate, the curve is know as Q-p Curve. Power gradually increases as we move towards right side (Note:- This phenomenon is only with centrifugal pumps). This means that as we open discharge valve, flow increases and so does the Power. This continues up to certain point and after that, there is a sudden drop of flow and power. This is not shown in following graph but same will be dealt within other topic. This point is known as cutoff point.
Please note that at point A, flow is q1 and power consumed by the pump is p1. And at point B, flow is q2 and power is p2. At point B, flow q2>q1 and p2>p1.
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