Serco materials industry-leading supply (Figure) | duckbill valve principle | duckbill valve provided by Serco Gongyi City Water Supply Materials Limited. Serco Gongyi City Water Supply Materials Co., Ltd. (www.gyxjbcq.com/) is a professional "PTFE lined rubber joints, standard waterproof casing, duckbill valve, power connector, stainless steel rubber joints" of the company. Since its inception, we adhere to the "honesty, sound management" approach, the courage to healthy competition in the market, so that "Serco supply material" brand has a good reputation. We adhere to the "service first, customers first" principle, so that the water supply materials Serco has won the trust of customers at the gate of the congregation, and establish a good corporate image. Special Note: This information is for reference pictures and information, please contact us to obtain the most accurate information, thank you! Duckbill valve made of elastic neoprene synthetic fibers specially processed, shaped like a beak, it said duckbill valve. Duckbill valve under no internal pressure in the case, the duckbill outlet itself under the elasticity of the closure; gradually increases with internal pressure, the duckbill duckbill valve outlet increases principle, maintaining the liquid can be discharged at high flow rates. The earliest design a duckbill valve, in order to cooperate with the national standards, following the provisions of the 800 caliber duckbill valve flange standard reference GB 1.0Mpa bolt hole center distance and diameter, the diameter of 800 or more (including) a duckbill valve types , 0.6Mpa bolt hole center distance and the outer diameter of the national standard reference. This series is a suite-type duckbill valve duckbill valve series plus aeration top accessory combination. Wastewater treatment process when the air is charged into the oxidation ditch to the valve open, is closed to prevent backflow when not required, attempts to prevent corrosion, long life, is simple to install. Aeration-type check valve maintenance required specifications less flexible, small diameter, while a larger amount, it is suitable for mass production.