Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . e seat, thus allowing the air in theauxiliary reservoir to flow to the brake cylinder, and ap-ply the brakes. At the same time the quick service ports,o and q, and the small cavity v, in the graduating valve,connect passage y. leading from chamber Y in the checkvalve case with passage r leading to the brake allows air from the brake pipe to lift the checkvalve, and flow through the above mentioned ports tothe brake cylind
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . e seat, thus allowing the air in theauxiliary reservoir to flow to the brake cylinder, and ap-ply the brakes. At the same time the quick service ports,o and q, and the small cavity v, in the graduating valve,connect passage y. leading from chamber Y in the checkvalve case with passage r leading to the brake allows air from the brake pipe to lift the checkvalve, and flow through the above mentioned ports tothe brake cylinder. This constitutes the quick serviceaction of the triple valve, in that it causes a slight, but 790 LOCOMOTIVE ENGINEERING definite reduction in brake pipe pressure locally, at eachvalve. The effect of a reduction in brake-pipe pressure,made at the brake valve, is thus quickly and uniformlytransmitted from car to car throughout the train. Theamount of air vented from the brake pipe to the quickservice ports is not great for two reasons: first, becausethe ports and the passage ways are small; second, be-cause in the movement of the slide valve 3 to full. .wr:\m FIG. 353. FULL-SERVICE POSITION service position, the quick service port y is restricted asit approaches this position and completely closed justbefore service port z is fully open, as shown in Fig. y^. The amount of opening given the service port in anycase, depends upon the rate of reduction in brake pipepressure as compared with that of the auxiliary reservoir. If the former is at first rapid, as compared with the TYPE L TRIPLE VALVE 791 latter, which would be the case with short trains, thehigher auxiliary pressure moves the piston at once toFull-Service Position, Fig. 353, thus automatically cut-ting out the quick-service feature where it is not need-ed. When in Full-Service Position, Fig. 353, the serviceport z is fully open, and the quick-service port 0 is stops the flow of air from the brake pipe to
Size: 1912px × 1306px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
