Powder material from inlet to join, at this time, open the feed valve, at the same time return valve, discharge pump more than gas. When material added to a certain degree, this process is controlled by PLC, there are two kinds of control ways, one is charging time control, is a kind of material level meter control.) Close the feed valve and return valve. Warehouse pump console open pressure valve at the same time, the compressed air into the pump body is divided into three road (pressurized, fluidization, though), full of material flow. When finished, material conveying pipe pressure below the set point, shut down automatically pressure valve, to enter the second work cycle.