Pneumatic transport system for powdered materials

A pneumatic transport system for transferring powdered or granular material by a transport plug in a transport pipe from a plug setting portion to a discharge port in the transport pipe, the transport pipe having a material feeder connected to a material supply port formed integrally with the transport pipe,

• the material feeder being inclined so that the material supply port is positioned lower than the discharge port, the material feeder comprising:
• a valve for opening and closing a bottom opening of said material feeder, said bottom opening communicating with said material supply port of said transport pipe;
• an inclined guide plate for producing an escaping space thereunder in which no material is filled when materials are charged into said material feeder under the condition that said bottom opening is closed by said valve;
• and
• a slide damper disposed under said inclined guide plate, for dividing the material charged into said material feeder up and down so that some of the material enters said escaping space when the material is charged into said material feeder over the level of said guide plate.