Diseases of the air brake system; their causes, symptoms and cure . ficulty in locating anydefects that may arise in the operation of the device. CARRIES TOO MUCH AIR. If the train-pipe accumulates more than 70 pounds inthe running position it is very evident that air must bepassing from the drum into the train, but the conclusionmust not hastily be made that this is due to a defect inthe feed-valve, for it may be, and not infrequently is,caused by an imperfect gasket between two of the mainportions of the body of the valve. This is most apt tooccur in gasket (61) just at the point to the righ
Diseases of the air brake system; their causes, symptoms and cure . ficulty in locating anydefects that may arise in the operation of the device. CARRIES TOO MUCH AIR. If the train-pipe accumulates more than 70 pounds inthe running position it is very evident that air must bepassing from the drum into the train, but the conclusionmust not hastily be made that this is due to a defect inthe feed-valve, for it may be, and not infrequently is,caused by an imperfect gasket between two of the mainportions of the body of the valve. This is most apt tooccur in gasket (61) just at the point to the right of thepassage in which Fig. 61 stands in Plate 12, at whichplace it will be noticed there is a very narrow bearing. Leakage by this gasket will be manifested in stillanother way much more troublesome than a mere increasein the train-pipe pressure. SLUGGISH ACTION OF BRAKE IX SERVICE. It will prevent either partially or entirely the applica-tion of the brakes in ser\4ce position. This is because the ^ To Pump Governor a Gauge ^ -RED HAND- Main Reservoir Pressure. To Gauge -BLACK HAND- Train Pipe Pressure Fig. 8 (52) Plate H. Diseases of the Air Brake System. 53 pressure in the cavity D will not reduce with sufficientrapidity through the small preliminary exhaust port if airis leaking from the main drum into the cavit}^ at thesame time. To go back now to the increase of pressure in thetrain-pipe. This may be due to trouble with the feed-valve. It ispossible it may not be properly adjusted, or if it is allright in that respect it may be found to seat may be due to some bend or defect of a similar na-ture in the small spindle of the valve ((53) or possiblymerely dirt on the seat of this valve. In a case of thisnature it is hard to determine which is the most promis-ing field to investigate first. If in ser\ice applicationthe reduction in cavity ID is found to be slower than itshould be, the trouble is probably in the gasket, but if thissymptom is not present at a
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Keywords: ., bookcentury1800, bookdecade1890, bookiddiseasesofai, bookyear1894
