. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . direct opening from thepressure chamber to the application cylinder only, so that theyquickly become equalized. This cylinder volume, being small andconnected with that of the pressure chamber at 70 pounds pressure,equalizes at about 65 pounds. Also, in this position of the auto-matic brake valve, a small port in the rotary valve allows air fromthe main reservoirs to feed into the application-cylinder pipe, andthus to the application cylinder. The application
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . direct opening from thepressure chamber to the application cylinder only, so that theyquickly become equalized. This cylinder volume, being small andconnected with that of the pressure chamber at 70 pounds pressure,equalizes at about 65 pounds. Also, in this position of the auto-matic brake valve, a small port in the rotary valve allows air fromthe main reservoirs to feed into the application-cylinder pipe, andthus to the application cylinder. The application cylinder isnow connected to the safety valve through port h in the seat, cavityq and port r in the equalizing valve, and port I in the seat. Cavityq and port r in the equalizing valve are connected by a small port, AIR BRAKES 12 the size of which permits the air in the apphcatioii cyhnder to escapethrough the safety valve at the same rate that the air from themain reservoirs, feeding through the rotary valve of the automaticbrake valve, can supply it, preventing the pressure from rising abovethe adjustment of the safety valve. MR. i ifi. loo. i>iin ij^i .11 .N 1 for Distributing ValveCourtesy of Westinghouse Air Brake Company, Wilmerding, Pennsylvania In high-speed brake service, the feed valve is regulated for 110pounds l)rakc-])ipe pressure instead of 70, and main-reservoir pres-sure is 130 or 140 pounds. Under these conditions an emergencyapplication raises the application-cylinder pressure to about 93pounds; but the passage between cavity q and port r is so small that 126 AIR BRAKES the flow of application-cylinder pressure to the safety valve is justenough greater than the supply through the brake valve to decreasethat pressure in practically the same time and manner as is done bythe high-speed reducing valve, until it is approximately 75 reason why the pressure in the application cylinder, pressure MR
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