双层翻板阀主要利用上下阀门的在不同时间的开关使设备中间始终有一层阀板处于关闭隔断状态，来防止空气窜流，如果是在正压输送下，气动的双层锁气阀还可起到平衡及增压阀的助流作用，以达到设备即能连续脉动给料的同时又具有锁气的功能，以满足气力输送粉粒体物料的要求。Flap gate valve uses for high sealing performance at the collector of a pneumatic transport device ,For bulk materials that adhere to a grinding section, causing problems and For airtight closure at high temperature.It can prevent damage by trapped bulk materials.