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Chemical pumps are now widely used in industrial, agricultural, urban water replenishment, farmland, orchards for irrigation, for the transport of water or physical and chemical water. With the continuous use of chemical pump performance reflects the selection of chemical pumps have also been more users of the concern. Chemical pump selection 1, where the pump process. According to the process should be based on a reasonable to determine the pump flow and lift and other basic parameters. Generally consider the pump normal wear and tear, speed changes, may lead to head down, so choose the pump pump head can have 2% to 5% margin. But the maximum can not exceed 10%, the basic principle is to ensure that the pump runs in an efficient range. In addition, information on the status of the pump inlet can be obtained through the process for use in calculating the NPSH. 2, corrosive media and material selection. Due to the variety of chemical media and their different properties, accurate parameters such as corrosiveness, concentration, volatility, vapor pressure, viscosity and density are required. These properties are closely related to the choice of materials, not only metal materials but also Pay attention to the interaction of non-metallic materials and media. 3, the temperature of the medium. Temperature has a significant impact on the choice of chemical pump structure, such as the pump body support, cooling (or insulation) system design, are closely related to the temperature of the medium transported. 4, spindle seal and its auxiliary system of choice. It is understood that the main shaft seal caused by the failure of a high percentage of total failure, in some cases can reach 30% to 40%. Therefore, the choice of spindle seal is crucial. Selection of physical and chemical properties in addition to the media should also understand the sealed chamber pressure and sealed chamber temperature of these two important parameters. Through the above selection of chemical pump analysis, we can find that the selection of chemical pumps need to focus on the main focus of the process, material selection, media temperature, system selection and other factors. If you can pump chemical pump in the choice of more information on these efforts, I believe there will be a secondary role in the work.