Centrifugal pump characteristic curve will be determined by the experimental Q, H, N, η and other data plotted a set of curves. This picture is provided by the manufacturer of the pump for pump selection and operation of the department Reference: Centrifugal pump characteristic curve Different types of pump characteristic curves are different, but have the following three curves: (1) HQ line shows the relationship between head and flow ; (2) NQ line represents the relationship between pump shaft power and flow; (3) η-Q line shows the relationship between pump efficiency and flow; (4) pump characteristic curves are measured at a certain speed, so the characteristic curve Out of speed n value. Centrifugal pump characteristic curve of the highest point of efficiency is called the design point, the pump at the corresponding pressure head and the flow of work under the most economical. Centrifugal pump nameplate performance parameters that are the most efficient point of the operating parameters. Centrifugal pump performance curve can be used as a basis for selection of the pump. After confirming the type of pump, select the pump according to the flow rate and pressure head. Below we have collected a number of centrifugal pump types and the choice of the law, I hope for your actual selection of help First, the type of centrifugal pump by the nature of liquid can be divided into: (1) pumps (B, D , Sh type) for the transport of clean water and physical, chemical properties similar to water, cleaning fluid. (2) corrosion-resistant pump (F-type) used to transport acid, alkali and other corrosive liquids. (3) Oil pump (Y type) is used to transport petroleum products. Second, the choice of centrifugal pump (1) according to the nature of the liquid being transported and operating conditions to determine the type; (2) according to the flow (usually by the production tasks) and calculate the pressure head required in the pipeline to determine the pump model Or product catalog); (3) If the viscosity and density of the liquid to be transported differ greatly from that of water, the characteristic parameters of the pump should be calculated: flow rate, pressure head and shaft power. When choosing a centrifugal pump, there may be several types of pumps that meet the requirements of operating in the optimum range at the same time. In this case, you can determine the operating points of each pump, compare the efficiency of the operating point, the preferred choice. Centrifugal pump is characterized by liquid delivery capacity, uniform flow, but the resulting pressure is not high, and the pressure head with the flow changes. We all know that in the pump valve family. Centrifugal pump is the largest one, also has the greatest relationship with our daily life, of course, its demand in the market is also in Number1 position. The above specific cases, working principle and the selection of centrifugal pump I believe you have a certain understanding of the law, the following small series for you to integrate a series of professional centrifugal pump manufacturers and good brands. Hope that your purchase help.