. Railway mechanical engineer . r of the machine at this point. Largediameter graduated dials, equipped with obser\ation stops,are provided for lioth the hand longitudinal feed and also forthe cross feed. NO. 4 BRAKE PIPE VENT VALVE The \Yestinghouse Air Brake Company, Wilmerding, Pa.,has recentlv developed a brake pipe vent valve to provide amore positive means than has heretofore been available forinitiating and propagating quick action throughout a in service conditions involving the handling oftrains of greater weight and length, with increased brakepipe volume, have made it
. Railway mechanical engineer . r of the machine at this point. Largediameter graduated dials, equipped with obser\ation stops,are provided for lioth the hand longitudinal feed and also forthe cross feed. NO. 4 BRAKE PIPE VENT VALVE The \Yestinghouse Air Brake Company, Wilmerding, Pa.,has recentlv developed a brake pipe vent valve to provide amore positive means than has heretofore been available forinitiating and propagating quick action throughout a in service conditions involving the handling oftrains of greater weight and length, with increased brakepipe volume, have made it increasingly difficult to insure theproper quick action throughout the train. This is especiallytrue when double heading, or when the first car or cars in atrain are cut out, or when the cars are so coupled together (incases where the triple valves are installed on the ends) thatthey are too far apart for quick action to be carried from oneto another and throughout the train. The No. 4 brake pipe vent valve has been designed to. ^ipeTapCross Section of Vent Valve meet these conditions and, to insure the necessary stability ofoperation, has been made a separate device to operate inde-pendently of the triple valve, distriljuting valve or other vent-ing devices. Thus the reliability of the vent valve is uni-formly insured, at the same time undesired quick action dueto erratic action of the service parts of other brake devices orto the overcharging of the brake pipe on the engine andtender is eliminated. The No. 4 brake pipe vent valve comprises an emergencypiston, 2 (Figs. 1 and 2), with its slide valve, 5, a vent valve4, and quick action piston, 5, and an actuating volume calledthe quick action chamber. When the system is beingcharged, brake pipe air flows through passage a to the leftof vent valve 4. and thence through passage h to chamber Aabove the emergency piston -, forcing the piston to its lowestposition. This opens charging port c in the piston bushing,permitting brake pi
Size: 1471px × 1699px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
