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Centrifugal pump characteristic curve Indenter, flow, power and efficiency are the main performance parameters of the centrifugal pump. The relationship between these parameters can be determined experimentally. Centrifugal pump production department will be the basic performance parameters of their products with a curve, these curves called the centrifugal pump characteristic curves (characteristic curves). For use by the department pumping and operating reference. Characteristic curve is measured at a fixed speed, only for the speed, so the characteristic curve are indicated on the value of speed n, Figure 2-6 for the domestic 4B20 centrifugal pump at n = 2900r / min when the characteristic curve . There are three curves drawn on the graph, namely 1. H-Q curve The H-Q curve shows the relationship between the pump flow rate Q and the indenter H. Centrifugal pump head pressure in the larger flow range is reduced with the increase. Different types of centrifugal pumps, H-Q curve of the shape of different. If the curve is flat, suitable for little change in the pressure head and large flow changes in the occasion; some curves are steep, suitable for a wide range of pressure head does not allow flow changes too large occasion. 2. N-Q curve The N-Q curve shows the relationship between the pump flow rate Q and the shaft power N, which increases as Q increases. Obviously, when Q = 0, the pump shaft consumes the least amount of power. Therefore, when starting the centrifugal pump, in order to reduce the starting power, the outlet valve should be closed. 3. η-Q curve The η-Q curve shows the relationship between the pump flow Q and the efficiency η. At the beginning, η increases with the increase of Q, and then decreases with the increase of Q after reaching the maximum value. The maximum value of this curve corresponds to the highest point of efficiency. Pump at the point corresponding to the pressure head and flow rate operation, the highest efficiency. So this point is the design point of the centrifugal pump. When choosing a pump, you always want the pump to work at its highest efficiency because it is the most economical to operate under these conditions. However, in practice, it is often impossible for the pump to operate precisely under this condition. Therefore, generally, only one working range can be defined as the pump's high efficiency zone, as shown by the wavy line in Figure 2-6. The efficiency of high efficiency area should not be less than 92% of the highest efficiency. Pumps are marked on the nameplate with the highest efficiency of flow, pressure head and power. Centrifugal pump catalogs and instructions often indicate the most efficient area of ​​the flow, pressure head and power range.