DSK water ring vacuum pump is a new energy-saving product developed on the basis of SK, SZ and SKC vacuum pumps and in combination of the production features of industries of new building materials, petroleum, papermaking, pharmacy, food, ceramics, sugar refining, printing and dyeing, metallurgy and electronics. Adopting advanced movable air exhausting device that substituting the rubber ball air exhausting device of SK, SZ and SKC type pumps, it has the characteristics of fast and uniform pumping, stable performance and capability of frequent starting.