“SF” Volumetric Screw Feeders    Volumetric screw feeders are used to control the flow rate of bulk mat­erial from a bin or hopper. They are set up to be flood fed, so that regardless of the amount of mat­erial in a hopper above the inlet, the out­let rate will re­main constant. It is this trait that makes screw feeders a critical part of a sys­tem, as they set the rate of mat­erial flow for the rest of the equipment down­stream. Screw feeders are avail­able to feed a wide range of materials.    Output capacity is determined by shaft speed—rushes and temp­orary gaps in the flow are elim­in­ated. This may prevent “flooding” or “choking” down­stream equipment that has no cap­acity to regulate in­put.    Multiple-screw feeders are used to control the flow rate of bulk mat­erial that tend to bridge from a bin or hopper.    Live bottom screw feeders are de­signed to be mounted under flat bottom bins to control the flow rate of materials that tend to pack or bridge under pres­sure. Tap­ered pitch or variable pitch screws are used in live bottom screw feeders to draw the bulk material evenly from all areas of inlet opening.   Screw feeder with drive. Covers are re­moved in these photos for illustration. Never operate screw feeders with­out all covers and guards in place. Single Screw Capacity Size Max RPM CFH @ 1 RPM CFH @ Max.RPM   Size RPM CFH @ 1 RPM CFH @ Max.RPM 4 75 1.46 110   16 50 105 5,235 6 70 4.98 349   18 45 151 5,235 9 65 18.5 1,203   20 40 209 8,360 12 60 44.4 2,664   24 30 363 10,890 14 55 70 3,850           Options Heavy Duty Flighting Heavy duty components Short pitch flighting Double flighting Variable pitch flighting Tapered flighting Stainless steel or galvanized Special materials Flow indication switch Plug switch Abrasion resistant liners Tubular trough Special shaft seals Feeder extensions Flared inlet extensions Open end discharges Electric motor and drive packages

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