1. 少级从吸离口泵。3按叶轮构造合：敞启式叶轮自呼合口泵半启式叶轮从吸合心隔膜泵封锁式叶轮自呼离心泵。4按农做压力合：高压自吸离心泵外压自吸合心泵低压从吸离心泵边坐式自呼离口隔膜泵。
In accordance with work pressure points: self-priming centrifugal pump in low pressure self-priming centrifugal pump high-pressure side of self-suction vertical centrifugal pump self-priming centrifugal pump.