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Roots for the divide CNPC + screw dry vacuum pumps diaphragm vacuum pumps dry vacuum screw pump diaphragm compared to other dry-type vacuum pump diaphragm has obvious advantages, such as short path gas, gas can be quickly discharged, and the condensate can be reduced the possibility of accumulation of small particles; the use of single-stage diaphragm vacuum pump through road design, fewer of the process gas stirring, vibration small, noise is low; In addition, the diaphragm pump of simple structure, fewer components, easy maintenance, which is the preferred conditions . In short, Tuthill dry diaphragm vacuum pumps for chemical industry, pharmaceutical industry's tailor-made, single-diaphragm vacuum pumping speed of up to 2700 m3 / h, vacuum needed to achieve a short time; and suited to handle a large number of wet steam, the largest entrainment of liquid can be as high as the volume of 1.1m3 / h. Second, Roots vacuum pumps diaphragm + diaphragm vacuum pumps liquid ring vacuum unit in the ABS and PS in the application of ABS resin is a general range between engineering plastics and high-performance thermoplastic engineering plastics, have been widely used in household appliances, IT industry, building materials, automotive industry and other fields. At present, ABS production in the world, second only to polyethylene, polyvinyl chloride, polypropylene and polystyrene, ranking fifth. ABS item may be the United States DOW Chemical Company Process for continuous bulk emulsion method and the traditional process. This continuous bulk emulsion method and traditional process compared to the production process with short, covers an area of small, low investment, low pollution features, has a strong economy.