Nowadays, the application of self-priming pumps in enterprises and municipal engineering is more and more extensive. Since the self sucking pump not only has the characteristics of the pipeline centrifugal pump, but also has its own advantages, the self suction pump can replace centrifugal pumps and submersible pumps in a large part of the process. After years of technology development, self priming pump has formed a series of products, such as stainless steel self priming pump, explosion-proof self priming pump, hygienic self priming pump and so on. Traffic flows from small to large and small to most of them. Self priming performance is an important index to evaluate whether the self priming pump is of high quality. The unique hydraulic model and the quality of the sealing baffle at the inlet will affect the quality of the pump. The high suction self priming pump has a certain limit for the so-called high suction range. Theoretically, the suction time is 10.33 meters under the standard atmospheric pressure, and the suction time of the self priming pump will not exceed 8m. The ordinary centrifugal pump or self-priming pump will meet many technical problems when the flow is too large, and the development of the large self suction pump is also limited. The dual suction technology makes the self - suction pump meet the demand for large flow.
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