. Air brake text for engineers and firemen; . alled respectively thepressure and the application chambers. The latter is ordinarilyconnected with the application portion of the distributing valvein such a way as to enlarge the volume of that part of it calledthe application cylinder (Plate 72). The connections betweenthese parts, as well as their operation, may be compared with thatof a miniature brake set, the equalizing portion representing thetriple valve, the pressure chamber the auxiliary reservoir, andthe application portion always having practically the same pres-sure in its cylinder as
. Air brake text for engineers and firemen; . alled respectively thepressure and the application chambers. The latter is ordinarilyconnected with the application portion of the distributing valvein such a way as to enlarge the volume of that part of it calledthe application cylinder (Plate 72). The connections betweenthese parts, as well as their operation, may be compared with thatof a miniature brake set, the equalizing portion representing thetriple valve, the pressure chamber the auxiliary reservoir, andthe application portion always having practically the same pres-sure in its cylinder as that in the brake cylinders. This is shownby the diagrammatic illustration on Plate ^2. For convenience,compactness and security they are combined in one device, asshown on Plates 73 and 74. The equalizing portion and pressurechamber are used in automatic applications only. Reductions of NO. 6 ET LOCOMOTIVE BRAKE EQUIPMENT. 167 >\PPLICATION-CYLINDER. TO MAIN RESERVOIR. TO INDEPENDENT ANDAUTOMATIC BRAKE VALVCS. TO INDEPeNOENT BRAKE APPLICATIONCHAMBER. wM & \\\\\\\\\\v\\\\\\\\^ PRESSURE CHAMBER. PLATE 72, i68 NO. 6 ET LOCOMOTIVE BRAKE EQUIPMENT. brake pipe pressure cause the equalizing valve to connect thepressure chamber to the application cylinder, allowing air to flowfrom the former to the latter. The upper slide valve connectedto the piston rod of the application portion admits air to the brakecylinders and is called the application valve, while the lower onereleases the air from the brake cylinders and is called the ex-haust valve. As the air admitted to the brake cylinders comesdirectly from the main reservoirs, the supply is practically un-limited. Any pressure in the application cylinder will force theapplication piston to close the exhaust valve, open the appli-cation . valve and admit air from the main reservoirs to thelocomotive brake cylinders until their pressure equals that in theapplication cylinder. Also any variation of application cylinderpressure wi
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