. Air brake text for engineers and firemen; . ressure as cham-ber A. The pressures in chambers A and B and the signal pipeare equal when the signal line is fully charged. When the signalcord is pulled and a reduction is made in the signal line pressureit also causes a reduction of pressure in chamber A of the signalvalve, but passage CC being very small the pressure in chamt>erA above diaphragm SV 3 reduces faster than the pressure inchamber B; consequently the diaphragm and uprights AA are NEW YORK TRAIN AIR SIGNAL SYSTEM. 289 forced upward and raise exhaust valve SV 8 from, its seat, thus
. Air brake text for engineers and firemen; . ressure as cham-ber A. The pressures in chambers A and B and the signal pipeare equal when the signal line is fully charged. When the signalcord is pulled and a reduction is made in the signal line pressureit also causes a reduction of pressure in chamber A of the signalvalve, but passage CC being very small the pressure in chamt>erA above diaphragm SV 3 reduces faster than the pressure inchamber B; consequently the diaphragm and uprights AA are NEW YORK TRAIN AIR SIGNAL SYSTEM. 289 forced upward and raise exhaust valve SV 8 from, its seat, thuspermitting the air in chamber A to flow into passage E leadingto the whistle, which causes a blast. The same reduction ofpressure that operates the signal valve also opens the reducingvalve, which then allows the pressure from the main reservoirto pass through the reducing valve and into the signal line, rais-ing the pressure to normal. This increase of pressure, followingimmediately after the reduction in the signal line, increases the 3 Bo. PLATE 140. pressure in chamber A faster than in chamber B, thus forcing thediaphragm downward and permitting exhaust valve SV 8 to closepassage E, thus stopping the flow of air to the whistle. All other parts of the New York air signal equipment notmentioned herein are interchangeable with and operate upon thesame principle as those of the Westinghouse Air Signal equip-ment, previously described on pages 97 to^ 103. DEFECTS OF THE NEW YORK AIR SIGNAL SYSTEM.*Although there are comparatively few parts in the air signalsystem- it requires good judgment to locate defects that will causeimproper operation. If the signal system fails to charge it should first be noted thatthe cocks between the first car and the tender are open; if open,the lining of the hose may be loose, blocking the passage, and ifin cold weather the signal line on the engine and tender may befrozen up or not cut in, or the regulating spring of the reducingvalve may be broken
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