File:Air brake text for engineers and firemen; (1908) (14757997261).jpg

Identifier: airbraketextfore00nati (find matches)
Title: Air brake text for engineers and firemen;
Year: 1908 (1900s)
Authors: National correspondence school of railroading, Chicago. (from old catalog)
Subjects: Air-brakes. (from old catalog)
Publisher: (Chicago?)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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piston valve 7 are greater than of upper piston valve 7the steam forces piston 23 and piston valves 7 downward to theposition shown. Steam is admitted to the cylinder through theupper ports in bushing 26, raising piston 10, while the steamabove piston 10 passes through the upper parts in bushing 25,thence through bushing /, /^ shown by dotted lines, into chamberg and out at Y, through an exhaust pipe to the smoke arch,from which it is discharged to the atmosphere through the smoke-stack. When piston 10 has nearly completed its upward stroke,reversing plate 18 engages shoulder n and also raises reversingvalve 16 to its uppermost position, in which port a is closed, andas the cavity in the valve connects ports b and c, the steam abovepiston 23 is discharged through port b, the cavity in reversingslide valve 16, port c and port /, /, into chamber g, and thence tothe atmosphere through the exhaust pipe at Y. When piston 10 has nearly completed its downward stroke. WESTINGHOUSE AIR PUMPS.
Text Appearing After Image:
WESTINGHOUSE AIR PUMPS. 5 the lower face of reversing plate 18 engages the button at thelower end of the reversing rod 17, drawing the reversing slidevalve down, and the motion of the pump is again reversed. Operation—Air End. During the upward stroke of thepump the air above piston 11 is compressed and dischargedthrough port p into the space between receiving valve 31 anddischarge valve 30, forcing the latter from its seat and flowingthrough chamber t and port r, into chamber ^ and out at z to themain reservoir. The main reservoir pressure in chamber .y holds lower dis-charge valve 30 upon its seat during the upward stroke of thepump, and, a partial vacuum being formed below piston 11, lowerreceiving valve 31 is forced from its seat by atmospheric pres-sure, which then enters the lower part of the air cylinder. In thedownward stroke of the pump the conditions are reversed;upper receiving valve 31 is lifted to fill the chamber above pistonII as it descends, and the air compressed be

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