... -0.6MPA 4.by pneumatic without motor 1. consists of vacuum generator, filter, hopper, discharging valve, control panel, hose, etc. ... top. When the compressed air is supplied, the vacuum generator generates the vacuum condition to suck the material into the hopper. ... the signal, it repeats the procedure. 4. Application:packing machine, tablet pressing machine, etc. QVC pneumatic vacuum feeder conveyor