This series is made suit type duckbill valve duckbill valve series plus aeration top accessory combination. Sewage treatment process, when the oxidation ditch filled with open air valve power transmission connectors, no closed to prevent reflux, attempts to prevent corrosion Transmission Joint manufacturers, long-life double flanged pipe power transmission connectors, installation is simple. Aeration type check valve maintenance required specifications less flexible, small diameter, and a larger amount, it is suitable for mass production. Use duckbill valve should note the following questions: 1. With a bypass valve opens 2, gate drive mechanism with a bypass valve opening should be preceded by product using the standard installation instructions. 3. Always lubricate the valve 4, the hand wheel and drive mechanism are collisions. 5, double plate, valve should be installed vertically. Double flanged pipe dowel joints, dowel joints, Serco supply materials provided by Serco Gongyi City Water Supply Materials Co., Ltd. Serco Gongyi City Water Supply Materials Co., Ltd. (www.gyxjbcq.com/) strong, credible, in Zhengzhou, Henan gate valve industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Serco supply material and you work into the brilliant, for a better future!