The rotary type discharge valve also known as electric discharge valve, star discharge valve, etc. It consists of motor, tooth differenced planetary gear speed reducer (X) or nylon needle cycloid speed reducer (Z) and turn the dragon tripper. It often applied to non sticky dry fine powder or granular materials. Such as raw powder, cement, slag, coal powder, etc. Normally, they often installed in the following material library or ash bin. For block material, it can’t be used due to the block material is easy to jam their impeller.