In the process of vacuum distillation, dehydration, concentration, and drying in the chemical, pharmaceutical and other industries, not only the vacuum system is required to have the ability to pump water vapor and condensable gas, but also the vacuum system is required to be able to operate under a certain pressure.

The most widely used in this process is the roots water ring vacuum unit. This kind of roots water ring vacuum unit is widely used in the chemical industry and can be used to extract corrosive gases and organic solvents.

But when pumping corrosive gases, the pump body and rotor of the Roots DVE vacuum pump and the pump body and impeller of the water ring DVE vacuum pump must be made of 316L stainless steel, or use chemical surface treatment technology to coat the part in contact with the process gas One layer of Meadows (NEDOX).

This kind of coating is characterized by good wear resistance, non-sticking and non-flaking. After heat treatment, the surface hardness can reach HV750~1000, and the coating thickness is 10~15 m.

When this kind of Roots water ring vacuum unit needs to pump out organic solvents, the working fluid of the water ring DVE vacuum pump must be compatible with the pumped solvent, the mechanical seal needs to use PTFE mechanical seal, and the working fluid closed circulation system.
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