. A textbook on the locomotive and the air brake . to the signal whistle. The valvebody is divided into two chambers A and B by the rubberdiaphragm 12, which operates the diaphragm stem 10. Thisrubber diaphragm has two disks, one of sheet iron on the top,and one of brass on the bottom, and through these disks thereis screwed a brass plug having a small hole bored through itfor the passage of air. The valve 10 is held to its seat bygravity, and controls the passage e leading to the whistle,A disk is turned on the stem of valve 10 for three uprights* a, One iipriglit has been removed in the illu
. A textbook on the locomotive and the air brake . to the signal whistle. The valvebody is divided into two chambers A and B by the rubberdiaphragm 12, which operates the diaphragm stem 10. Thisrubber diaphragm has two disks, one of sheet iron on the top,and one of brass on the bottom, and through these disks thereis screwed a brass plug having a small hole bored through itfor the passage of air. The valve 10 is held to its seat bygravity, and controls the passage e leading to the whistle,A disk is turned on the stem of valve 10 for three uprights* a, One iipriglit has been removed in the illustrati THE NEW YORK AIR BRAKE. 18 to press against and lift the valve from its seat wheneverdiaphragm 12 rises. The clearance between the uprights a and the disk on the stem of valve 10 should not exceed inch. 7. Opei-atiou of Talve.—When the signal pipe is beingcharged, air enters the signal valve at X. and, passing throughthe small port r/, charges chamber^4. It also passes through thepassage cc, and feeds down slowly into chamber B^ charging. this to the same pressure as chamber A. The pressures inchambers A and B and the signal pipe are equal when the pipeis fully charged. When the signal cord is pulled and a reduction is made inthe signal pipe, it causes a reduction of pressure in the signalvalve also, but the passage cc is very small, and the pressure inchamber A above the diaphragm reduces faster than the pressurein chamber B, consequently, the diaphragm and uprights «, aare forced upwards and raise the exhaust valve 10 from its seat,thus permitting the air in chamber A to flow into the passage eleading to the whistle, which causes the whistle to give a blast. The same reduction of pressure that operates the signal valvealso opens the reducing valve, which then allows pressure fromthe main reservoir to flow into, and raise the pressure in, the §18 THE NEW YORK AIR BRAKE. 9 signal pipe. This increase of pressure, following immediatelyafter the reduction in the signal
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
