The physical and chemical properties of the transport medium directly affect the performance, material and structure of the pump and are an important factor that must be considered in the selection. Medium refers to the liquid being delivered. General physical and chemical properties of liquids include: media name, media characteristics (such as corrosiveness, abrasiveness, toxicity, etc.), solid particle content and particle size, density, viscosity, gasification pressure and so on. When necessary, the gas content of the medium should also be listed, indicating whether the medium is easy to crystallize and so on. Effect of medium characteristics on pump selection. First of all, in terms of its literal meaning, the oil pump should generally convey the liquid with lubricity. If there is no corrosive, abrasive and is a clean liquid, as long as the use of conventional pump can be gear pump or three screw pump, the material has no special requirements, the use of conventional materials (carbon steel) can be. So the special physical and chemical properties of the media pump selection What impact? 1, If ​​the medium is corrosive, the overcurrent components of the pump should be made of anti-corrosion material such as 304 stainless steel or other corrosion-resistant materials. 2, if the medium is abrasive, its abrasive size, if the abrasive serious, not only to pay attention to the material and should be used single screw pump or twin screw pump and other structural forms. 3, if the medium is toxic, hazardous to human health, we must prevent the leakage of the medium, so the focus should be on the pump shaft seal up and down, the best choice of multi-spring mechanical seal. 4, the medium viscosity is too low, you can not use the gear pump or screw pump delivery, centrifugal pumps should be selected. You buy the best pump in the process of the physical and chemical properties of the pump one by one to the pump, or the media submitted to the media test, in order to achieve the best selection results.
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