. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . f. FromFig. 52 it will be noted that in the quick-service position port 2;in the slide valve and port r in the seat do not fully register. Never-theless, when the train is of considerable length, the opening issufficient to allow the air to flow from the auxiliary reservoir tothe brake cylinder with sufficient rapidity to reduce the pressurein the auxiliary reservoir as fast as the pressure is reducing in thebrake pipe; but if the brake-pipe reduction is more
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . f. FromFig. 52 it will be noted that in the quick-service position port 2;in the slide valve and port r in the seat do not fully register. Never-theless, when the train is of considerable length, the opening issufficient to allow the air to flow from the auxiliary reservoir tothe brake cylinder with sufficient rapidity to reduce the pressurein the auxiliary reservoir as fast as the pressure is reducing in thebrake pipe; but if the brake-pipe reduction is more rapid than that AIR BRAKES 69 of the auxiliary reservoir, which may be the case on short trains,the difference in pressure on the two sides of piston 4 becomessufficient to shghtly compress the graduating spring and movesthe sUde valve to the position shown in Fig. 53 called full this position, quick-service port y is closed, so that no air flowsfrom the brake pipe to the brake cylinder; also, in full-service posi-tion ports z and r are fully open, allowing the auxiliary-reservoir Auxiliary Resepvoip R Brake Cylinder c. rpIPE TAP Brake Pipe BP Fig. 53. TjTDe K Valvo Shown in Full-Service PositionCourtesy of Westinghouse Air Brake Company, Wilmerding, Pennsylvania pressure to reduce more rapidly, so as to keep pace with the morerapid brake-pipe reduction. Zap Position. When the brake-pipe reduction ceases, aircontinues to flow from the auxiliary reservoir through ports z andr to the brake cylinder until the pressure in the chamber R becomesenough less than that of the brake pipe to cause piston 4 and grad-uating valve 7 to move to the left until the shoulder on the pistonstem strikes the right-hand end of slide valve 3. As the friction 70 AIR BRAKES of the piston and graduating valve is much less than that of the slidevalve, the difference in pressure which will move the piston andgraduating valve will not be sufficient to move all three; conse-quently, the piston st
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