1. High utmost vacuum rate, it can be less than 0.5 mbar 2. High deflating speed 3. Low noise while working 4. Reliable structure to prevent oil back 5. Strong capacity in deflating the vapor 6. It can still work normally when the air pressure input keeps 1.33*103pa 7. Saving energy; protecting environment; an oil fog clearer is set in the vacuum, and no oil fog in the exhaust air 8. Tight structure, scientific and reasonable design, and it is easy to install in the industry system