Rotary feeder is called as rotary valve or star shape feeder. This special equipment is applicable for unloading, packing, mixing, dust collection, metering, rationing conveying of solid materials (powder, particles and its mixtures) conveying system. The working principle is, by driving motor and reduction gears to turn equi-divided structure impeller inside the shell, then materials from upper silo of the shell or feeder are filled inside cavity of impeller, where materials are discharged along with impeller rotating to the bottom of shell. Materials can be discharged equably and continuously to the downstream unit according to the conveying system requirements. Neutral