. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ork of the equalizingpiston or the amount of airthat must be expanded fromthe brake pipe on a long trainwhen a service reduction isdesired. The equalizing res-ervoir pressure escapesthrough an opening 5/64 of aninch in diameter, when thebrake valve is in service posi-tion, and it is essential to acorrect operation that thispreliminary exhaust port isneither enlarged nor restrict-ed in the opening, it should re-duce equalizing reservoirpressure from no to 90 from 5 to 6 seconds, andfrom
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ork of the equalizingpiston or the amount of airthat must be expanded fromthe brake pipe on a long trainwhen a service reduction isdesired. The equalizing res-ervoir pressure escapesthrough an opening 5/64 of aninch in diameter, when thebrake valve is in service posi-tion, and it is essential to acorrect operation that thispreliminary exhaust port isneither enlarged nor restrict-ed in the opening, it should re-duce equalizing reservoirpressure from no to 90 from 5 to 6 seconds, andfrom 70 to so lbs. in from 6to 7 seconds. If the pressure is reducedin less time, or if the blackhand on the air gauge fallsfaster than the time givenit indicates an enlarged pre-liminary exhaust port, leakagefrom the equalizing reservoirvolume, or a reduced volumeif the hand falls at a morerapid rate, with a tendencyto build up again on the gauge, it indi-cates a restriction in the pipe connectionsto the equalizing reservoir. If the fall of the hand on the gaugeis slower than the time given, it indi-. AtA/N ffrstff/tf/ff SECTION OF THE H6 BRAKE VALVE. the fact that the 06 valve was designedto operate the brakes on trains offrom 30 to 50 cars, while the H6 equip-ment is designed for all classes of f^UMf^,* service, and especially for locomotivescates a restricted opening through the that can handle from 80 to 120 cars; this looks very inconsistent at thefirst glance; however, the rate of dis-charge from both brake valves is thesame, in spite of the difference of 1/32of an inch in the opening, as the air inescaping from the angle-fitting of theG6 valve makes two right angle turns,while in escaping from the H6 valve itmakes but one turn at a right angle.~ When we realize that the resistance to FIG. I. VARIATION OF BRAKE PIPE the flow of air by adding an elbow isPRESSURE IN LONG TRAIN. increased, even in this short distance, branch pipes, but because ofthe extreme length of pipebe
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