File:A textbook on the locomotive and the air brake (1901) (14755788201).jpg

Identifier: textbookonlocomo02inte (find matches)
Title: A textbook on the locomotive and the air brake
Year: 1901 (1900s)
Authors: International Correspondence Schools
Subjects: Locomotives Locomotive boilers Locomotives Railroad cars
Publisher: Scranton, Pa., International textbook co
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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in cylinder 4- and in the steamchests, ports, and passages would then expand and forcepiston 21 downwards, shifting valve 6 to the position shown inFig. 4, and allowing the steam in cylinder ^ to exhaust. Thesteam then contained in cylinder 3 above the piston, the steamchests, ports, and passages would expand again and forcepiston 22 down. Hence, when steam is shut off, the pistonsalways come to rest at the bottom of the cylinders. 26. When starting, steam enters the chambers^ and 5;steam passages 23 and 26 are open for the admission of steam,l)ut only piston 21 will be moved upwards, the steam that enterscylinder 4 simply acting to hold piston 22 down. When piston21 completes its stroke, it will shift slide valve 6 to its upperposition and steam wall then enter cylinder 4 through port 27,and underneath piston 22, moving it upwards. The livesteam already in cylinder 4, above piston 22, will then exhaustthrough port 23, and the pump will proceed to work in themanner already described.
Text Appearing After Image:
§15 THE NEW YORK AIR BRAKE. 15 27. Referring to Fig. 4, 57 is the union nut for the steam-pipe and pump connection, and 59 is the union nut for theexhaust pipe. A drain cock 5Jf. is screwed into the steam pas-sage 19; its duty is to afford a means of draining away anycondensation that may accumulate. Cap nuts 15 are screwedinto the steam head and against bushings 16 and 17 to hold thebushings in their proper positions. The packing rings 33 preventleakage of steam from one side of the piston to the other. Thereversing valve-plate bolts 55 are screwed into the piston andextend through it, their ends being riveted over. The cylinder-head bolts 52 secure the heads to the cylinder. The center-piece 35 forms the upper head for the steam cylinders and thelower head for the air cylinders. The stuffingboxes are com-posed of the brass bushings 36, screwed into the air- and steam-cylinder heads, the gland nuts 57, and, inside of them, theglands 38, which holds the packing tightly about the pist

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