The VRV Hopper discharge unit are mounted below hoppers, silos, bunkers or bulk containers for flowable bulk materials and serves as a combined closure, discharge, transportation and metering device. It is used where larger conveying capacity is required. Upon request, dust tight design is optional.

The fluidity of some powdery bulk materials is very poor, and the unloading operation cannot be realized through various auxiliary flow methods, such as silo wall vibrator, air hammer, hammer and even air cannon.