. The miller, millwright and millfurnisher. therarefaction of the air both inside and outside the dust-catcher. The time 24 364 COOLING THE CHOP. when the dust should be taken off is thus indicated. The intensity of thecurrent of air, which may be regulated by the check valve, ;-, is also accu-rately determined by the vacuum gauge q. The advantages which are ob-tained by this invention are numerous and important. The old method ofventilation permitted only a moderate current of air to be passed betweenthe stones, on account of the great loss of flour dust incurred by a strongcurrent; but with
. The miller, millwright and millfurnisher. therarefaction of the air both inside and outside the dust-catcher. The time 24 364 COOLING THE CHOP. when the dust should be taken off is thus indicated. The intensity of thecurrent of air, which may be regulated by the check valve, ;-, is also accu-rately determined by the vacuum gauge q. The advantages which are ob-tained by this invention are numerous and important. The old method ofventilation permitted only a moderate current of air to be passed betweenthe stones, on account of the great loss of flour dust incurred by a strongcurrent; but with the use of this aspiration, as strong a current of air as couldpossibly be desired for cool grinding is easily produced, and is not attendedwith the loss of a particle of flour dust. It is also evident that by its usethe capacity of a mill can be considerably increased. In preventing the con-densation of vapor, this apparatus causes the formation of paste to cease,and no trouble from this source with conveyors, elevators and bolting cloth. Fig. 262.—Behrns-Brehmer Exhaust. is experienced in the mills where this ventilation is employed, besides ob-viating the fires and explosions arising from the accumulation of flourdust of the former system. All of the ventilating apparatus for one mill areconnected with only one exhaust fan, no matter how many pairs of burrs areto be ventilated. The meal discharge valve of Fig. 261 is a wooden flap valve held closedby its weight and the suction of the exhaust. The weight of the meal willforce it open and the meal will pass out without permitting the air to enter. The discharge valve shown in Fig. 262 is made of cast iron, and containsa conveyer screw similar to that shown in Fig. 260, but occupying a horizon-tal position. By it the meal is forced against an iron flap valve which pre-vents the air from entering the curb through the meal discharge spout. Inboth cases the chop, itself accumulating around the flap valve, forms a veryeffectual p
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectflourmi, bookyear1882
