Diseases of the air brake system; their causes, symptoms and cure . leasedwhen cut out) bled the lJUnder but not the reservoir. Aslong as the pressure in the reser\oir was greater thanthat in the train-pipe, the main piston was held in appli-cation position, while the opening to the cjdinder couldbe shut and the exhaust from the cylinder opened byturning the four-way cock to cut out position. This would not reduce the pressure in the reser\-oir,and so, as soon as the valve was cut in again, the brakewould reset. In most of these cases the reservoir pressure could havebeen reduced simply by mov
Diseases of the air brake system; their causes, symptoms and cure . leasedwhen cut out) bled the lJUnder but not the reservoir. Aslong as the pressure in the reser\oir was greater thanthat in the train-pipe, the main piston was held in appli-cation position, while the opening to the cjdinder couldbe shut and the exhaust from the cylinder opened byturning the four-way cock to cut out position. This would not reduce the pressure in the reser\-oir,and so, as soon as the valve was cut in again, the brakewould reset. In most of these cases the reservoir pressure could havebeen reduced simply by moving the handle clear aroundbeyond the straight air position as far as it would go, forthis would bring the exhaust groove opposite the port fromthe reser\oir, and allow the reservoir pressure to escapeuntil the piston and slide-valve moved back to cut off theopening. Another defective point about this design was that thepiston was not allowed sufficient travel to pull the slide-valve entirely past the opening to the cylinder. 102 Diseaees of the Air Brake Equalizing Valve of 28. Diseases of the Air Brake System. 103 BRAKE REFUSES TO SET. As a result of the above mentioned condition, this triplebecomes entirely inoperative when the graduating pinbreaks, because the air pressure closes the graduating-valve, thus shutting off the only passage through whichair might have reached the C3-linder. There are at the present da}^ many of these valves,which, though in good condition, are allowed to run cutout simply because of the lack of a proper understandingof them by the trainmen. Equalizing Valve of 1888. Plate 28 is taken from Westinghouse temporary cata-logue for 1888, plate C. 7, and was about the first formof the present equalizing valve put into service. Mostof those sent out have since been removed, so that, notso much with a view to practical usefulness, as in thelight of an item of interest, we here insert a few wordsconcerning it. It differed from the later
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Keywords: ., bookcentury1800, bookdecade1890, bookiddiseasesofai, bookyear1894
