. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . d auxiliary-reservoir pressures become pressure obtained in the brake cylinder is no higher then whena full-service application is made, but the maximum pressure isobtained more quickly. When the piston and slide valve of the quick-action triplevalve move to the emergency position, Fig. 48, port s in the slidevalve registers with port r in the seat, allowing air to flow from the AIR BRAKES 61 auxiliary reservoir to the brake cylinder. Port s is
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . d auxiliary-reservoir pressures become pressure obtained in the brake cylinder is no higher then whena full-service application is made, but the maximum pressure isobtained more quickly. When the piston and slide valve of the quick-action triplevalve move to the emergency position, Fig. 48, port s in the slidevalve registers with port r in the seat, allowing air to flow from the AIR BRAKES 61 auxiliary reservoir to the brake cylinder. Port s is small, however,and in this position the slide valve also opens port t in its seat,allowing air to flow from chamber m through port t to the chamberabove the emergency piston 8. The other side of emergency piston8 is connected to the brake cylinder, in which there is no air pressure,consequently the emergency piston is forced downward, pushingthe emergency valve 10 from its seat and allowing air in chamber Yabove the check valve 15 to flow past the emergency valve 10 tochamber X and the brake-cylinder. Brake-pipe air in a below the. Fig. 48. Westinghouse Quick-Action Triple Valve, Showing Emergency Position check valve 15, then raises the check valve and flows to thebrake cyUnder through the passages mentioned. During an emer-gency application, therefore, the quick-action triple valve suppliesair to the brake cylinder from the brake pipe as well as from theauxiliary reservoir. Approximately 60-pound brake-cylinder pressure is obtainedon emergency applications, the air from the brake pipe increasingthe cylinder pressure about 20 per cent above the maximum obtain-able with a full-service application. 62 AIR BRAKES This venting the brake-pipe pressure into the brake-cyHnderaids the speed of an emergency apphcation, as each triple valvereduces the brake-pipe pressure sufficiently to set the next triplevalve in the train to emergency. The release after an emergency application is obt
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