. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ylvania 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
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ylvania 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 stops in the position shown in Fig. 54. Thismovement has caused the graduating valve to close port z, thuscutting off any further flow of air from the auxiliary reservoir tothe brake cylinder and also to port o, thus preventing further flow Auxiliary Reservoir Brake Cylinder c. I PIPE TAP BRAKE PIPEBP Fig. 54. Type K Triple Valve Shown in Lap PositionCourtesy of Westinghouse Air Brake Company, Wilmerding, Pennsylvania of air from the brake pipe through the quick-service ports. Con-sequently, no further change in air pressures can occur, and thisposition is called lajp because all ports are lapped or closed. It will be seen that the exact position of the slide valve 3 inlap position depends upon whether its previous position was thatof quick service, Fig. 52, or full service, Fig. 53. If the former,the lap position assumed would be quick-service lap position, asshown in Fig. 54. If the slide valve had previously moved to full- AIR BRAKES 71 service position, however, the lap position assumed would be fulUservice lap position, in which the shde valve would still remain infull-service position. Fig. 53, but with the graduating
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