. A textbook on the locomotive and the air brake . auxiliary reservoir on account of the valve n acting as a check,for if the pressure in the auxiliary were to get less than that inthe air tank (7, the greater pressure in the latter would keep nfirmer on its seat. Of course, if valve n leaks, its value as anon-return check is gone; and this is one of the things thatmust be watched, for then the air will flow back into theauxiliary and probably cause the wheels to be skid. The hole s §13 CAR HEATING. 91 is to allow the escape of any air that may happen to passthrough to the upper side of the di
. A textbook on the locomotive and the air brake . auxiliary reservoir on account of the valve n acting as a check,for if the pressure in the auxiliary were to get less than that inthe air tank (7, the greater pressure in the latter would keep nfirmer on its seat. Of course, if valve n leaks, its value as anon-return check is gone; and this is one of the things thatmust be watched, for then the air will flow back into theauxiliary and probably cause the wheels to be skid. The hole s §13 CAR HEATING. 91 is to allow the escape of any air that may happen to passthrough to the upper side of the diaphragm, thus preventingthe accumulation of pressure there. REDUCING VALVE. 108. The reducing valve r is shown in section in Fig. with the air tank is made at C, and at D with. O from Air TankFig. 39. the pipe leading to the water tank. The object of this valveis to reduce the pressure to 20 pounds per square inch before itgoes into the water system. In the figure, a is the valve body;h and c, the upper and lower caps; d, the diaphragm, and cZ, 92 CAR HEATING. § 13 the diaphragm plate, forced down by spring i encircling thestem h. The supply valve / is held on its seat by the spring , when all pressure is off, the diaphragm d is down and theend of it stem h presses on the stem of the supply valve / andso keeps the latter oS its seat ready to admit air to the watersystem. This air comes from the air tank or reservoir at Candpasses up ports o, o and past the seat of valve I and so intochamber r, and thence through passage q to the water the pressure in the tank, and therefore in chamber r,exceeds 20 pounds per square inch, the pressure on the dia-phragm becomes greater than the resistance of spring i andmoves it up, thus removing the pressure f
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
