The Rotary Feeder (rotary airlock valve) is an industrial device used for the controlled, continuous discharge of bulk, powdered, and granular materials from silos, hoppers, and dust filters, while simultaneously functioning as an air lock between two chambers of differing pressure. The unit consists of a cylindrical housing with a square flanged inlet at the top, a flanged outlet at the bottom, a bladed rotor at the center of the chamber, and a drive shaft connected to a gearbox or motor at the end of the housing.

Operation is based on the continuous rotation of the vaned rotor around a central axis: material enters through the top inlet into the space between two consecutive rotor vanes, and as the rotor turns, it is carried and discharged toward the bottom outlet in a batch-wise manner at a constant rate. The vaned design of this feeder precisely regulates the material discharge rate while preventing air or gas leakage between the upstream and downstream chambers. Due to its high dosing accuracy and effective sealing capability, this type of feeder is widely used in industries such as cement, mining, steel, food processing, and dust filtration systems.