Identifier: cyclopediaofloco00swin (find matches)
Title: Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives
Year: 1916 (1910s)
Authors: Swingle, Calvin Franklin, 1846- (from old catalog)
Subjects: Locomotives
Publisher: Chicago, F. J. Drake & co., pub. for Sears, Roebuck & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Referring to Fig. 299, whichshows the movable parts of the valve in the release posi-tion, it will be seen that as chamber p is connected to the brake pipe, brake-pipe air flows through the feedgroove around the top of piston 26 into the chamberabove the slide valve 31, and through port 0 to the pres-sure chamber, until the pressures on both sides of thepiston are equal. Service. When a service application is made withthe automatic brake valve, the brake-pipe pressure inchamber p is reduced, causing a difference in pressure onthe two sides of this piston, which results in the pistonmoving toward the right. The first movement of thepiston closes the feed groove, and at the same time movesthe graduating valve until it uncovers the upper end ofport z in the equalizing slide valve 31. As the pistoncontinues its movement, the shoulder on the end of itsstem engages the slide valve, which is then also moved to the right until port 2 in the slide valve registers with port ET BRAKE EQUIPMENT 683
Text Appearing After Image:
////////////M FIG. 302. AUTOMATIC SERVICE 684 LOCOMOTIVE ENGINEERING h in the seat. As the slide valve chamber is alwavs incommunication with the pressure chamber, air can nowflow from it to the application chamber. This pressureforces application piston 10 to the right, as shown inFig. 302, causing application valve 5 to uncover port band allow main reservoir air to flow to the brake cylin-ders through port c, as in an independent application. During the movement just described, cavity t in thegraduating valve connects ports r and s in the equalizingslide valve, and by the same movement ports r and s arebrought into register with ports h and / in the seat, thusestablishing a communication from the application cham-ber to the safety-valve, which being set at 53 pounds,limits the brake-cylinder pressure to this amount duringa full service application. The amount of pressure resulting in the applicationchamber for a certain brake-pipe reduction, depends onthe comparative volumes of the

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