Flexible pump suction and discharge fluid can be divided into three stages (see the working principle diagram), which guarantees the fluid into the pump chamber (by pump self-absorption capacity or fluid weight) is the premise of normal pump work. From this point of view, the choice of speed is essentially a suction performance issue; especially in high viscosity, if the speed is too high, it will cause inhalation, resulting in noise, vibration; may also lead to motor overload and reduce the use of the impeller Life expectancy and other issues. Therefore, as the media viscosity increases, the pump diameter should also be increased, the speed should be reduced accordingly. The flexible pump produced by our company can handle media up to 10000 cps. Perceptually, the medium can be pumped into the pump chamber by its own weight. The relationship between viscosity and speed is shown in the following table: Medium Viscosity Range (Centipoise) Corresponding Maximum Speed ​​(rpm) 1000 or less 600-200 In addition to viscosity, The choice also depends on several factors: Absorption of abrasive media should be reduced speed, which can greatly extend the life of the pump. Absorption of fragile, shear sensitive media, should be low speed; for example, delivery of yogurt, speed should be 600 rpm or less. In addition, it is noteworthy that: the level of the speed of the flexible pump self-priming capacity; in order to maintain a self-priming height of 3 meters above, the speed should be 800 rev / min or more.
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