Feeder DA Rotary (Airlock) General The DA Feeder introduces material into the conveying system at highest volumetric efficiency when material flow into the feeder is controlled to permit free venting. The feeder may be used under a head of material when appropriate aeration is provided to create a path for relief of the reverse air flow. In operation, air enters a single inlet and passes into the rotor pocket through two (2) ducts integrally cast in the end plates, assuring complete fluidization and discharge. High efficiency is attained through the combination of gravity and air-sweeping of the fluidized material into the conveying line. This design principle assists greatly in discharging materials which have a tendency of hanging up in the rotor pockets. DA Feeder permits the use of smaller sized components and related equipment in pressure pneumatic conveying systems resulting in savings in initial equipment cost, installation cost and space requirements. Available with or without motor drive, discharge pan and support base
Body The DA Feeder is constructed of machined #50 cast iron and incorporates a deep packing gland, outboard anti-friction bearings and an extra heavy shaft. Lantern rings are provided to permit use of purge air when handling fine, powdery material to prevent contamination of shaft packing.
Rotor The DA Feeder cast iron rotor features eight (8) equal pockets with volumes up to 1.6 cubic feet ( .05m3 ) per revolution. Rotors with beveling on the trailing edge are recommended for handling materials that have a tendency to smear.
Pressure The DA Feeder is designed for pressure differentials up to 18 PSIG (1.27 Kg/cm2).
Motor Mounting Motor support lugs are cast as an integral part of the feeder body to permit the mounting of a gear motor directly on the units, resulting in a compact package requiring minimum space.
Motor The DA Feeder with motor is equipped with a three (3) phase, 230/460 Volt A.C. 60Hz.TEFC, right angle motor unit. Sprocket and chain assembly with protective guard is included.
Discharge Pan and Support Base are optional and available at additional cost.
Feeder TE Rotary (Airlock) General When installed in a pressure conveying system, the use of (optional) Lantern Rings and (standard) Air Purge is recommended when fine powdery material is being conveyed to prevent contamination of packing and bearing. The air purge should be set 2 to 4 PSIG (.14 to .28 Kg/cm2) above conveying line pressure.
Body and End Plates The body and end plates are heavily ribbed and constructed of #50 cast iron. Motor support lugs are cast as an integral part of body and permit the mounting of the gearmotor directly on the unit, resulting in a compact package.
The end plates have integral cast outboard bearing supports and male-female joints between end plates and feeder body ensuring concentricity.
Rotor All rotors are constructed of machine #50 cast iron and have six or eight vanes with four vanes in seal between inlet and outlet except for the 2′′ totally enclosed feeder (airlock) which has four vanes.
The rotor shaft has a tapered hub to reduce friction from trapped material between rotor and end plates. Anti-friction bearings are shielded, and mounted on rotor shaft outboard of the packing gland.
Beveling of the rotor vane is recommended if the material has a tendency to build up and smear.
Motor Mounts All gearmotors are mounted directly to feeder body except the 2′′ and 5′′ (50 mm and 125 mm) TE Feeders which incorporate a single common steel base plate.
Motor Drive All fractional gearmotors are TENV. All integral horsepower gearmotors are TEFC. All gearmotors are 3 phase, 230/460 Volts, 60 Hz.
Special Notes All standard feeders (airlocks) are designed to handle material having a maximum temperature of 150° F (65° C). Above 150° F (65° C requires additional periphery and end clearances. From 700° F to 900° F (371° C to 482° C) requires additional clearance and water cooled shaft. Above 900° F (482° C) and not in excess 1200° F (650° C) requires ductile iron construction, special bearings and water cooled rotor.
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