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 Province.Meanwhile 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..