The rotor unit is composed by six wafers, which formed a ball shaped rotor unit with six pockets. The powder fills the pocket by gravity, when rotating the wafers, the powder will transfer from the pockets continuously and quantitatively. One design of the valve body is suitable for air conveying in pressure or vacuum condition; Another design of the valve body is suitable for clean in place (CIP) and sterilize in place(SIP). Compact and light weight design, it is easy for operation and maintenance.  It is widely apply to the feeding of powders, granules, capsules and tablets.