The typical PVC thin phase conveying system process generally uses Roots fans and rotary valves for conveying, and the process is described as follows: The PVC powder stored in the PVC bin is evenly pumped to the injector through the rotary valve, and is mixed with the air pressurized by Roots fans. The mixed air and PVC powder are driven by the pressure difference and transported to the PVC receiving bin through the conveying pipe. The air with powder material passes through the bag dust collector at the top of the bin to recover the powder material and become clean air and empty.

Conveyor system process flow: the process adopts downward bin pump, combined with annular gap air replenishment technology for material transportation. The PVC powder stored in the PVC silo enters one of the silo pumps (such as the A silo pump) through the three-way valve. When the level meter detects that the material level has reached the specified position, the feed valve and the drain valve are closed. The program automatically opens the lower intake valve to purge the pipeline, and then opens the discharge valve of the bin pump and the upper intake valve. The PVC powder is pressurized by compressed air and enters the Venturi injector for mixing with the lower intake air. The mixed PVC powder and air are transported to the PVC receiving bin through the conveying pipe. The air containing PVC powder is filtered by the cloth bag filter on the top of the bin and emptied. After the A bin pump is delivered, the discharge valve and the upper and lower intake valves are closed, the empting valve is opened, and the feed is re-fed, and then the B bin pump is delivered. The two bin pumps alternately "feed" and "transport" the PVC powder continuously delivered to the target bin.