Before the pump starts, fill the pump and the inlet pipe with water. After the pump runs, under the effect of centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller runner is thrown around and pressed into the volute. The inlet of the impeller forms a vacuum.Then the suction water is thrown out by the impeller through the volute and into the outlet pipe.It can be seen that, if the centrifugal pump impeller rotation, continuous water absorption, pressure, water can be continuously from low to high or distant.To sum up, centrifugal pump is due to the high speed rotation of the impeller produced by the centrifugal force, the water to the high, so called centrifugal pump.