When the high lift self priming pump is low head, the motor power will exceed the rated power. Because according to the characteristic graph of self-priming pump is clear that when the pressure drop, flow increases, the power curve also increased, and the efficiency of the pump is decreased, so the flow and lift pump selection is very important in the operation of the pump efficiency curve near the highest.
Self suction pump head is used to overcome resistance and height, high lift pump lift in his work when the flow is the design point of the flow, if in the low lift work, equivalent to the pump outlet resistance decreases, when the pump flow rate will increase, the motor is overload, over to a certain extent will be burned motor. For example, a water pump head 50 meters, flow of 50 cubic meters / hour, when it comes to the height of 50 meters of water, it is the flow of 50 cubic meters / hour, when it comes to the height of 40 meters of water, its height and resistance to reduce its flow may reach 80-90 cubic meters / hour or more. When the motor will be fever or burned.
As long as we understand the principle of self suction pump can pump, flow and head in the work, it is a relationship made, will understand the high lift self-priming pump in low lift when using the problems needing attention.
