Roots vacuum structural features (1) over a wide pressure range greater pumping speed; (2) a rotor having a good geometric symmetry Henan Roots vacuum outlets, so little vibration, smooth operation. Between the rotor and the gap between the rotor and the housing are without lubrication, friction loss is small Roots vacuum pump, can greatly reduce the driving power, enabling high speed; (3) the pump chamber without sealing and lubricating oil can be reduced oil vapor contamination of the vacuum system ZJH belt Roots vacuum relief valve, on the basis of the original (ZJ, ZJP) improved fourth generation of new products, using a pair of eight rotors anti constant in the pump chamber rotated to generate suction and discharge action. Each rotor is supported with two bearings, using a pair of synchronizing gears, the relative positions of the two rotors remain exactly the same, there are gaps between the rotor and the rotor, the rotor with the pump rotor and the side cover, and therefore the working chamber Henan Roots vacuum uses no friction, no lubrication. Pump rotor is supported with a reliable anti-backlash structure, fan balancing precision helical gears using computer running smoothly Henan Roots vacuum quotes, low noise, the use of more reliable, long-term operation at high differential pressure. Henan Roots pump prices _ _ Zhucheng East Han Machinery Co., Roots vacuum provided by Zhucheng East Han Machinery Co. Zhucheng East Han Machinery Co., Ltd. (www.dhlcfj.com) is an industry leader in Shandong Weifang, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Zhucheng East Han Machinery Co. led the staff warmly welcome all inquiries negotiations to create Zhucheng East Han Machinery Co., a better future.