. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . as rapidly as it is admitted through theservice-application port of the triple valve. Emergency Application. In an emergency application of thebrakes, the rapid admission of a large volume of air to the brakecylinder raises the pressure more quickly than it can be dischargedthrough the service port of the pressure-reducing valve. Underthese conditions, piston 4 of the high-speed reducing valve. Fig. 75,is forced to the lower end of its stroke, in which positi
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . as rapidly as it is admitted through theservice-application port of the triple valve. Emergency Application. In an emergency application of thebrakes, the rapid admission of a large volume of air to the brakecylinder raises the pressure more quickly than it can be dischargedthrough the service port of the pressure-reducing valve. Underthese conditions, piston 4 of the high-speed reducing valve. Fig. 75,is forced to the lower end of its stroke, in which position the apexof triangular port b in the slide valve is brought to register withport a, thus restricting the discharge of air from the brake cylinder. Fig. 75. Position of Ports, Emergency Stop forWestinghouse High-Speed Reducing Valve 94 AIR BRAKES in such a manner that the pressure in the brake cyUnder does notbecome reduced to 60 pounds until the speed of the train has beenvery materially decreased; but the area of the opening of port b gradually increases as the reducingpressure above piston 4 permits thespring to raise the piston and slidevalve slowly. The rate of the dis-charge thus increases as the speedof the train decreases, until finally,when the brake-cylinder pressurehas become reduced to 60 pounds,port a is closed, and the remainderof the brake-cylinder ^pressure isretained until released in the usualway through the triple valve. When an emergency applica-tion of the brakes occurs at highspeeds, there is little danger of w^heelsliding, and it will be observed thatport b is so shaped Jthat brake-cyl-inder pressure escapes slowly at suchtime, as already explained; while,at lower speeds, where a heavy-service application i
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