The choice of the action mode of the electric diaphragm pump The action mode of the electric diaphragm pump is only used when the pneumatic actuator is selected. The mode of action is formed by the positive and negative action of the actuator and the positive and negative action of the valve. There are four types of combination that is positive (air-off type), positive and negative (air-type), anyway (air-type), anti-anti (anti-off type) Open and Qi off two. For the diaphragm pump mode of action, mainly from three aspects: a) process safety; b) the characteristics of the media; c) to ensure product quality, economic loss minimum. The flow characteristics of the electric diaphragm pump refer to the relationship between the relative flow of the medium flowing through the valve and the displacement (the relative opening of the valve). The ideal flow characteristics are mainly straight line, equal percentage (logarithm), parabola and quick opening. The only commonly used ideal flow characteristics, such as straight line, such as the percentage (logarithm), quickly open three. Parabolic flow characteristics between the straight line and equal percentage, the general percentage of the characteristics can be used instead of the other, while the fast opening characteristics are mainly used for two-bit adjustment and program control, so the selection of diaphragm pump is actually a straight line and equal percentage flow characteristics s Choice. Electric diaphragm pump flow characteristics of the choice can be calculated by theory, but the methods and equations used are very complicated. At present, the use of more experience guidelines, specifically from the following aspects: â‘ from the regulatory system to adjust the quality of analysis and selection; â‘¡ from process piping considerations; â‘¢ 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.
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