For many years at this point Roots vacuum pumps have already been well established in the region of vacuum technology. In combination with backing pumps, which compress against the atmosphere, these pumps offer plenty of advantages.
Features:
The main advantage of roots vacuum pump is a high pumping speed at the low inlet pressure with high ultimate vacuum. Because the pump running parts haven’t any contact, such as for example rotors and the end cover, so the pump efficiency is stable and long service time. low maintenance cost
Applications:
They’re widely used in vacuum smelting, vacuum welding, vacuum casting, vacuum coating, vacuum drying, vacuum dynamic experiment and chemical pharmaceutical, electric vacuum device manufacturing industries.
Because of the chemical, pharmaceutical and various other industries require huge vapor degassing capablity. the sealing framework of roots vacuum pump chamber and the bearing chamber has improved, which significantly reducing the bearing cavity and 
equipment cavity oil emulsification. Hence, roots vacuum pump is usually more ideal for pumping large quantities of water vapor and solvent with water ring vacuum pump.