Positive pressure airlock and negative pressure airlock is the main auxiliary equipment in flour mill. During the  material conveying process, it can evenly feed, and the upper and lower air pressure are blocked off to play  a sealing role, so that the air ventilation system works normally. It is used in the dust removal system to collect  materials and serve as a  the silo discharge .

Applicable to dust, powder, small particle materials, in the process of positive and negative pressure  suction, the material is separated and discharged, widely used in food processing, feed, environmental  protection and other industries.