A flow control system for controlling flow of materials such as seeds orfertilizer as the materials are fed into a manifold and meter unit of an airseeder. Theflow control system generally includes a flow controller which is connectedbetweena volume of materials, such as a tank, and a manifold of an air seeder. Theflowcontroller is adapted to control flow of the materials into the manifold to bemeteredby a meter unit. The flow controller includes a plurality of movable gates；with eachgate being adapted to selectively open or close a corresponding opening in theflowcontroller. The gates may be manually adjusted, such as by a handle, or may beautomatically adjusted, such as by actuators. By selectively opening orclosingvarious gates, the volume and speed of flow of materials into the manifold maybeeasily and efficiently adjusted.
