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      1, there is no medium in the working cavity, can get clean vacuum.

      2. The pump cavity of Roots pump is treated with nickel plating layer, while the pump cavity of screw pump is treated with nickel plating layer or PTFE coating, which can remove water vapor, solvent gas and a variety of corrosive media and adapt to harsh working conditions.

      3, the gas in the pump is not compressed, suitable for the extraction of condensable gas.

      4, single pump can be pumped from the atmosphere to 1Pa, vacuum system can be greatly simplified.

      5. The water temperature has little effect on the vacuum, saving more than 90% water, and even does not consume water.

      6, no oil consumption, no drip leakage.

      7. No friction between rotating parts, high speed operation, small size of the whole machine.

      8, simple structure, easy maintenance.

      9, the pumped gas is directly discharged from the pump body, no pollution of water, no environmental pressure, gas recovery is more convenient.

      10. It can be combined with Roots pump and molecular pump to form oil-free unit.

      The pump is designed to reduce production costs and reduce environmental pollution by eliminating the use of sealant or large amounts of vacuum oil. Dry screw vacuum pump, is the use of a pair of varying pitch screw, made in the pump shell synchronous high-speed reverse rotation of the effects of the suction and exhaust and suction device, two screw fine dynamic balancing correction, and is supported by bearings, is installed in the pump shell, between screw and screw has a certain gap, so the pump is working, no friction between each other, smooth running, low noise, working cavity without lubricating oil, therefore, can dry screw pump pumping contains a lot of water vapor and a small amount of dust in gas. Because the screw is made of variable pitch structure, the pumped gas is compressed in the working chamber. Compared with the same pitch structure, the limit vacuum is higher, and the power consumption is lower, which has the advantages of energy saving and maintenance free. It is the replacement product of oil seal vacuum pump.

      (1) Purification and special drying of pharmaceutical products;

      (2) the reduction of the solution, such as drying, filtration, crystallization and distillation process;

      (3) vacuum pumping treatment for food industry;

      (4) vacuum perfusion in the beverage industry

      (5) suction extrusion machine;

      (6) Recirculation of process gas;

      (7) vacuum separation of mixtures with boiling point;

      (8) The gas in the bottle is emptied before the high purity gas is injected;

      (9) Vacuum pumping in laboratories and in aircraft factory laboratories;

      (10) All vacuum processes that react with oil.