The Model “BT” Rotary Valve has been designed for applications where the bulk material requires assistance to remove it from the rotor vane pockets. In addition, the Model “BT” Rotary Valve is used when headroom space is limited. The Model “BT valve has a low profile as compare to the height of a standard drop-thru rotary valve and pneumatic conveyor’s inlet manifold. Model “BT” Rotary Valves are furnished for conveyline sizes from 1″ to 6″ pipe or tubing sizes. Rotors are always furnished with partially filled pockets. The Rotors have eight or twelve vane depending on the valve size and to provide two (2) sealing on each side for the valve. The two (2) seal minimizes air or gas loss between two different pressure zones while allowing dry solids material to pass from one pressure zone to the other. The Model “BT” rotary valve is designed as airlocks and airlock feeder for handling 15 PSIG housing and differential pressure or vacuum. The Model “BT” Rotary Valve with its large throughput capacity can handle a variety of bulk materials The Model “BT” Rotary Valves are available with different rotor designs and a wide variety of features to handle a wide range of process requirements. The Model “BT” rotary valve can be furnished in double length configuration for pneumatic conveying system requiring greater capacity without increasing the overall height requirement.