For many years today Roots vacuum pumps have already been well established in the area of vacuum technology. 
In mixture with backing pumps, which compress against the atmosphere, these pumps offer lots of advantages.
Features:
The main advantage of roots vacuum pump is a higher pumping speed at the low inlet pressure with high ultimate vacuum. Because the pump running parts haven’t any contact, such as rotors and the finish cover, so the pump efficiency is certainly 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 substance pharmaceutical, electric vacuum gadget manufacturing industries.
Because of the chemical substance, pharmaceutical and various other industries require huge vapor degassing capablity. the sealing structure of roots vacuum pump chamber and the bearing chamber offers improved, which greatly reducing the bearing cavity and equipment cavity oil emulsification. Thus, roots vacuum pump is definitely more ideal for pumping large levels of drinking water vapor and solvent with water ring vacuum pump.