And through the centrifugal pump and the combined centrifugal pump under the same suction conditions to carry out the water pumping comparison test, the test shows that: the combined centrifugal pump avoids the trouble of filling water, under the condition of the suction stroke of 6 meters, the combined centrifugal pump The pump can suck up the water, but the centrifugal pump cannot, that is, the combined centrifugal pump increases the suction lift from 3 to 6 meters.
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