... positive displacement technology and are typically used in liquid ring vacuum pump applications.but can also be used as a gas, ... the performance of the pump. Elmo Rietschle liquid ring pumps, however, meet these challenges.The use of high-quality materials such ... :1,Asphalt-thickening machines(steamrollers)2,Corrosion protection for water pipes3,Drying systems4,Dust extraction in the mining industry5, ...