Usually graph showing the relationship between the main performance parameters referred performance curve or characteristic curve of a centrifugal pump, in essence, the centrifugal pump performance curve is the external representation of the movement of the liquid in the pump, determined by measurement. The characteristic curves include: flow-head curve (QH), flow-efficiency curve (Q-η), flow-power curve (QN), flow-cavitation curve (Q-(NPSH)r), and the performance curve is Any flow point of the pump can find a set of heads, power, efficiency and NPSH values ​​on the curve. This set of parameters is called working state, referred to as working condition or working point, centrifugal pump. The working condition of zui high efficiency point is called zui good working condition point, and the good working condition point of zui is generally the design working condition point. Generally, the rated parameters of the centrifugal pump , that is, the design condition point coincides with or are close to the good working condition point. In the practice selection efficiency range, that is, energy saving, and can ensure the normal operation of the pump, it is very important to understand the performance parameters of the pump.
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