A mixed-flow pump is a type of pump between a centrifugal pump and an axial-flow pump. It works by the dual action of axial thrust and centrifugal force on the water flow when the impeller rotates. Its speed is higher than the centrifugal pump, lower than the axial flow pump, generally between 300-500. Its head is higher than the axial flow pump, but the flow is smaller than the axial flow pump and larger than the centrifugal pump. The mixed flow pump is a "pull-out" structure pump. When inspecting and removing the impeller and shaft seal, it is not necessary to disassemble the pipeline connected to the pump body. Equipped with precision-machined pump shaft and bearings with thin oil lubrication, a protective shaft sleeve is installed in the stuffing box cover. The oil level of the bearing box can be controlled by the constant oil cup.