By David Mills (Auth.)
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Extra resources for Pneumatic Conveying Design Guide
The venturi could be fed directly from a belt, screw or vibratory feeder, or a supply hopper could be used if fitted with either a valve or calibrated orifice plate. 6. Gate Lock Valves These are the least used of all devices for feeding conveying systems. They are also known as double flap valves, double dump gates and double door discharge gates. They consist of two doors or gates which alternately open and close to permit the passage of material from the supply hopper into the conveying line, 48 Feeding and Discharging the Conveying Line Figure 26.
If air leakage impedes material flow, the pockets will not fill completely. Too high a rotor speed has a similar effect. It should be noted that, because of air leakage, the volumetric efficiency of a rotary valve when feeding a negative pressure system will generally be much greater than that when feeding a positive pressure system. 4. Screw Feeders A simple type of screw feeder is shown in Figure 22. Rotation of the screw moves the material into the conveying line where it is dispersed and entrained with the conveying air.
Both operations offer a wide choice of alternatives. Positive pressure systems may be fed using rotary valves, Venturis, screw feeders or blow tanks, air supply pressure influencing the choice. Blow tanks provide only a batch-wise feed, restricting utilisation of the conveying line. Disengagement of coarse particles can be achieved by using a gravity setting chamber or a cyclone separator whereas finer particles can be removed by a combination of a cyclone separator and a fabric filter. The methods and associated equipment for feeding and discharging pneumatic conveyors are reviewed and their applications, limitations and control discussed.