Pump is also known as the control of the pump, is the main type of actuator, due to its ability to transport a variety of special media, such as toxic, volatile and flammable liquids such as play an important role in industrial production Role, but consumers in the product purchase due to the lack of professional guidance, diaphragm selection is often denied, you can not buy the favorite diaphragm pump products. This issue Xiaobian discuss with everyone the correct method of diaphragm selection. Diaphragm pump selection of the correct method Diaphragm pump selection should be from its mode of action, flow characteristics, caliber and type of method to be considered, the specific methods are as follows: 1, the role of diaphragm pump options: a, process safety; b, The characteristics of c, to ensure product quality, economic loss is minimal. 2, diaphragm pump flow characteristics of choice: diaphragm pump flow characteristics can be selected by theoretical calculations, but the methods and equations used are very complicated. At present, the use of more empirical criteria, specifically from the following aspects: (1) regulation of the quality of regulation from the system analysis and selection; (2) from the process of piping considerations; (3) from the load changes. Select the flow characteristics of the diaphragm pump, you can determine the valve spool according to its flow characteristics of the shape and structure, but for such as diaphragm valves, butterfly valves, because of their structural characteristics, it is impossible to change the shape of the valve spool to achieve The required flow characteristics can be achieved by changing the feedback cam profile of the valve positioner fitted. 3, the choice of Diaphragm Pump Diaphragm: The choice of diaphragm pump diameter and determine the main basis for the flow of the valve that cv. In a variety of engineering instrument design and selection, should be calculated on the diaphragm cv, and provide diaphragm design instructions. Calculated from the diaphragm pump cv to determine the diameter of the valve, generally required by the following steps: a, to determine the flow rate. The existing production capacity, equipment load and medium conditions, decided to calculate the flow rate of qmax and qmin. B, before and after the valve to determine the pressure. According to the selected valve flow characteristics and system characteristics selected s (resistance coefficient), and then determine the calculation of pressure. c, calculate cv. According to the adjusted medium to choose the appropriate formula and charts, obtained cmax and cmin. D, the choice of cv. According to cmax, in the selected product standard series select> cmax and its closest level c. E, diaphragm pump opening checking. The general requirements of the maximum flow when the calculation of the opening ≯ 90%, the minimum calculation of flow when the opening ≮ 10%. f, diaphragm pump actually adjustable ratio checking. Generally require the actual adjustable ratio ≮10. g, seat diameter and nominal diameter of the determination. After verification is appropriate, according to c to determine. 4, the choice of diaphragm pump type (1) diaphragm pump valve body type selection The choice of diaphragm is the most important part of the diaphragm pump. Diaphragm valve body types, commonly used through a single seat, through two-seater, angular, diaphragm, small flow, tee, eccentric rotation, butterfly, sleeve, spherical and other 10 species. Before choosing a valve, carefully analyze the medium, process conditions, and parameters of the control process, gather enough data to understand the system requirements for the diaphragm pump, and determine the type of valve to be used based on the data collected. In the specific choice, the following aspects can be considered: a, wear resistance When the fluid medium is a suspension containing high concentrations of abrasive particles, the valve core, the seat surface every time the closure will be severely rubbed. Therefore, the flow of the valve should be smooth, the valve's internal material to be hard. b, corrosion-resistant medium is corrosive, to meet the regulatory function of the situation, try to choose a simple structure of the valve. c, the shape of the valve core structure based on the selected flow characteristics and imbalance forces and other factors to consider. d, media temperature, pressure When the medium temperature, high pressure and changes in the large, the valve core and seat material should be selected by the temperature, pressure changes in small valves. e, to prevent flash and cavitation Flash and cavitation only produce in the liquid medium. In the actual production process, flash and cavitation not only affect the calculation of flow coefficient, but also the formation of vibration and noise, so that the valve life is shorter, so the valve should be selected to prevent flash and cavitation. (2) diaphragm pump actuator selection a, the output power considerations Actuator no matter what type of output force is used to overcome the effective load (mainly refers to unbalanced and unbalanced torque plus friction , Sealing force, gravity and other related forces). Therefore, in order for the diaphragm pump to work properly, the associated actuator must be capable of producing enough output force to overcome various resistances and ensure a high degree of sealing and valve opening. b, the type of implementing agencies The above is the principle and basic method diaphragm selection, of course, the specific circumstances of the specific analysis, consumers should take the appropriate method based on the actual situation to buy, so as to "Amoy" favorite diaphragm Pumps. Extended reading: "Industry Leader" magazine This article belongs to Industrial Internet (Xiamen) Technology Co., Ltd. All are welcome to reprint, please indicate the author and source. Author: Asian pumps Network Editor: April (QQ / micro letter:) starting: http: //beng.liuti.cn/ (service hotline:)
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