Rotary Airlocks are also usually known as Rotary Vane Feeders, Rotary Valves. It is a compact Mechanical Equipment for continuously Discharging Bulk Powders gradually into the process of a plant. It is also a metering device, where the discharge capacity of a process plant is set by this Rotary valves. There is only one moving Part; a multi-vane rotor revolves in very close contact of housing. It has one Inlet at the Top and one Outlet at the Bottom. The discharge capacity depends on the volume of Rotors Pocket, the no of revolutions of rotor in a minute & the bulk density of process-material.