Impeller feeder impeller feeder known as the star unloader (star cinder valve, star unloader valve, electric air lock) can be used in the collection of material systems, as silo unloader, star shaped unloader is currently the most advanced discharging device, with good sealing, smooth transmission, durable and reliable, easy maintenance, with flexible impeller, enhanced flexible sealing, reliable, bearing lateral displacement of the valve body, cut off the dust direct source, extending bearing life and easy maintenance. Equipped with cycloid reducer, compact structure, stable and reliable. Commonly used in dust removal system as one of the important equipment dust removal system, which is particularly suitable for dust and small particles like, pneumatic conveying, by the environmental protection, metallurgy, chemical industry, food, cement, construction, drying equipment and other industries to select the best projects.