Abstract: An auger venturi conveying system for particulate materials includes a hopper-fed auger conveyor section for transporting the particulate material toward the discharge end of a barrel and a venturi arrangement for non-turbulent mixing of the material transported through the barrel with a pressurized gas flow. The venturi arrangement comprises a plenum chamber surrounding the barrel of the auger conveyor section adjacent the discharge end, a venturi pipe coupled to the plenum chamber having a tapered section leading to a constriction, and a jet member within the venturi pipe coupled to the discharge end of the barrel and extending approximately to the constriction. The outer surface of the jet member cooperates with the interior surface of the tapered section of the venturi pipe to form a narrow annular passage between the plenum chamber and the constriction of the venturi pipe. The venturi pipe is coupled at its other end to a conduit.

Abstract: A pneumatic conveying system for a granular, powdery, or liquid product which utilizes during normal operation pressure differentials to convey and to regulate the flow of product through the system. A high velocity stream of air creates a pressure differential between a main pipeline and a product chute elbow to thereby suck the product into the stream of air. The system includes a pair of tank chambers so that the product may be fed alternatively from the two tank chambers into the product chute elbow. The tank chambers may be of sufficiently small size so that switching from tank to tank occurs less than two minutes apart preferably in the range of from about one minute to one second. Each tank chamber includes outlet and inlet openings which are pressure operated. The switching is controlled by introduction of air into one tank at a time which simultaneously closes the product inlet opening into the tank and opens the outlet opening.

Abstract: A pneumatic conveying system for a pulverant, powdery, or liquid product utilizes a high velocity stream of air to create, during normal operation, a zone of negative pressure within a transition chamber into which the product is fed from an inclined chute. The negative pressure condition in the transition chamber tends to suck the product into the air stream. A check valve door on the chute is opened by reason of the negative pressure to allow product feed and is automatically closed to prevent further product feed and blowback resulting from back pressure when the system is blocked. The product may be fed alternately from a pair of tanks of sufficiently small size so that switching from tank to tank occurs less than two minutes apart. The switching is controlled by introduction of low pressure air into one tank at a time which simultaneously closes the product inlet opening into the tank and opens the outlet opening.