Zhengzhou Deao Science & Technology Co., Ltd specializes in manufacturing of continuous screen changer and melt pump. With the 20-plus years of R & D experience, the production technology leads the advanced level. Besides, the New Impulses Filtration Systems was invented and awarded international patent in 2007. For successive of years, it is appraised as a high-tech enterprise, Zhengzhou pilot project of patent company as well as a key service institution, completing science and technology innovation project and Key Technologies R &D Program in Henan ***** we are certified to ISO 9001:2000. All the patterns of screen changers ranging from double-piston, plate, and belt to backflush style replace the screen without stopping the machine, no leakage, simple operation, improving the production as well as saving the energy. Simultaneously, they can also be applied to the production of a variety of raw materials. Our firm aims at the motivation of Scientific and technological innovation, striving for excellence, good faith, and services for clients with the heart and soul.