VDP series variable pitch screw dry vacuum pump is a vacuum generating equipment that utilizes a pair of screw rotors to rotate synchronously at high speed oppositely inside the pump casing, generating suction and exhaust effects. Its maintenance free design technology has solved the problems of high maintenance cost of vacuum pumps. The working chamber of the vacuum pump does not require lubricating oil and sealing fluid, and can recover various condensable gases, solving the pollution problems that may be caused by steam jet pumps, slide valve pumps, rotary vane pumps, liquid ring pumps, etc. to the vacuum system and the environment. At the same time, recycling can also create additional economic benefits. 

① Series name ② maximum pumping speed (m3/h) 

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High vacuum can be obtained in a solvent environment or slightly acid-base alkali-base corrosive environment, with a vacuum degree of up to 5Pa. No water pollution, no oil pollution, beneficial for obtaining clean gas. 

1. Compared with constant pitch screw pump, it has higher air extraction efficiency and lower energy consumption. 

 2. The pumping speed range is wide, and extracted gas can be directly discharged into the atmosphere. A single pump can achieve the effect of multi-stage series connection. A single stage design can achieve a vacuum of 5Pa. 

 3. Nitrogen purging can be used, which is easy to do cleaning and maintenance. 

 4. The screw material is an integral ductile iron with high strength and stable performance. 

 5. The screws do not come into contact with each other, have no friction, do not require lubricating grease, do not have oil flow back, do not emit waste gas, so that the pump is environmental friendly with low energy consumption. 

 6. The interior of the pump chamber and spare parts can undergo surface anti-corrosion treatment as needed, which is suitable for the special requirements of the chemical and pharmaceutical industry. Nickel phosphorus alloy or Teflon and other coatings optional. 

 7. The screw is done by fine dynamic balance correction to make sure smooth operation, low noise, low vibration, and long service life.