. A textbook on the locomotive and the air brake . signal pipe with the signal valve, from which •inch pipe leads to the whistle. Air from the main reservoir can thuspass through the pressure-reducing valve and thence into thesignal pipe and signal valve, but at a reduced pressure. Apressure of 40 pounds is usually m-iintained in the signal I. ^ I J 6 —0 1 THE NEW YORK AIR BRAKE. 18 system, and the duty of the reducing valve is to diminish thepressure from 90 pounds (main-reservoir pressure) down tothe required pressure for use in the signal S3stem. Formerly the pressure-reducing valve wasfreq
. A textbook on the locomotive and the air brake . signal pipe with the signal valve, from which •inch pipe leads to the whistle. Air from the main reservoir can thuspass through the pressure-reducing valve and thence into thesignal pipe and signal valve, but at a reduced pressure. Apressure of 40 pounds is usually m-iintained in the signal I. ^ I J 6 —0 1 THE NEW YORK AIR BRAKE. 18 system, and the duty of the reducing valve is to diminish thepressure from 90 pounds (main-reservoir pressure) down tothe required pressure for use in the signal S3stem. Formerly the pressure-reducing valve wasfrequently screwed directly into the top or endof the main reservoir, but experience has shownthat much better results are obtained byplacing this valve in the cab of the locomotive,in Which place it is much better protected fromdirt and from freezing. The signal Avliistle, Fig. 3 (a small whistlelocated in the cab, as close to the engineer aspracticable), is piped to the signal valve, asmentioned, and it is the operation of the latterthat causes the whistle to blow. When the conductor wishes to transmit asignal to the engineer, he gives the signal cordin one of the cars a pull. This opens the cardischarge valve on that car and allows some ofthe air in the main signal line to escape tothe atmosphere, thus reducing the signal-pipeFig. 3.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
