File:Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives (1916) (14590055028).jpg

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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out at the waste-pipe connection (g); stud 60 istapped in the back of the governor under piston 53,to carry off any steam that might leak by the stem ofvalve 51, or any air that might leak around packingring 54, consequently should both the vent port andthe waste pipe become clogged the governor wouldnot shut off the pump, and the main-reservoir pres-sure would run up to boiler pressure. Engineers Brake Valve In applying the brakes with the quick-action triple,it is not only necessary to reduce the train-pipe pres-sure lower than that in the auxiliary, but it is abso-lutely necessary that the reduction be made gradually to prevent the emergency action. The old-style brake valve, or three-way cock, hadonly three positions, viz: application, lap and release,and while some men seem to think the new brakevalve has only two positions, on and off. thereare, however, five positions, as follows: full release, AUTOMATIC AIR BRAKES 52Q running position, lap, service application, and emer-gency.
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2 4 — tq 8mauT ntefflBB TO COVEBNOI) Figure 227D-8 Brake Valve and Rotary SeatThere are two kinds of brake valves, one has no feed,valve attachmen and is known as the D-8 and depends 530 LOCOMOTIVE ENGINEERING upon the pump governor to regulate the trainpipepressure. The other kind has a feed-valve attachmentfor controlling the trainpipe pressure, which leaves thepump governor to control the main-reservoir pressure,and is known as the F-6 and G-6 brake valve, accord-ing to the kind of feed valve there is on it. The F-6has the old style feed valve, and the G-6 has the newslide valve feed valve, as shown in Figs. 231 and 232. As the D-8 brake valve is now largely supersededby the F-6 and G-6 it will not be necessary to enterinto details in describing it, except to point out thedifferences between the two types of brake valves. The D-8 brake valve uses the pump governor tocontrol the trainpipe pressure of seventy pounds, andthe connection is made at V, Fig. 227, the excess iscontrolled

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