The curve representing the relationship between the main performance parameters is usually referred to as the performance curve or characteristic curve of the centrifugal pump. In essence, the performance curve of the centrifugal pump is an external manifestation of the movement of the liquid in the pump and is obtained by the actual measurement. The characteristic curves include: QH, Q-Q, QN, Q- (NPSH) r, and the performance curve is Pump any point of flow, can be found in the curve of a group of its head, power, efficiency and NPSH value, this group of parameters is called the working state, referred to as working conditions or conditions point, the centrifugal pump The most efficient point of the condition known as the best condition point, the best condition point is generally the design condition point. General centrifugal pump rated parameters that the design conditions point and the best conditions coincide or very close. Operating in the practice of selecting efficiency range, that is, energy conservation, but also to ensure the normal pump work, so understand the performance parameters of the pump is very important.
