компрессор в обратной линии
https://www.google.com/patents/US20160251172
This task is accomplished, in the case of a pneumatic conveyor for transporting bulk materials, particularly tablets, having a compressor for conveyor gas, and having a bulk material feed unit and a conveying line disposed in between and a bulk material discharge unit, wherein a return line for the conveyor gas is provided between the bulk material discharge unit and the compressor, in that the bulk material feed unit has a collection volume that is separated from the conveying line by means of a shutoff fitting.