Rotary vane vacuum pump features: 1. Small size, light weight, low noise; 2. With gas-operated valve, a small amount of water vapor can be removed; in the ambient temperature of five degrees Celsius to forty degrees Celsius, the inlet pressure is less than 1.3X103 Pa conditions to allow long-term continuous operation, was pumping gas relative humidity greater than 90 percent, should open the town valve. 3. With automatic anti-return oil check valve, easy to start; 4. The air inlet continuous flow of air should not exceed a minute; 5. Does not apply to the removal of the metal corrosion, the chemical reaction of the pump oil , Gas containing particulate dust, and oxygen-rich, explosive, toxic gases