. A textbook on the locomotive and the air brake . g the cap 7,loosening the locknut 9(\i tension is to be increased), and turn-ing the bolt screw 8 in the proper direction to give the resultdesired. The governor piston 4. rests on top of the steam-valvestem 25. Piston 4. is held up in its cylinder by the pressureof steam in chamber 26 pressing on the bottom of valve packing ring^.^ is made to fit as nearly air-tight as possible,in order to prevent any air from leaking into chamber d belowthe piston. The dotted circles / below the piston 4 show thedrip opening made through the body of t
. A textbook on the locomotive and the air brake . g the cap 7,loosening the locknut 9(\i tension is to be increased), and turn-ing the bolt screw 8 in the proper direction to give the resultdesired. The governor piston 4. rests on top of the steam-valvestem 25. Piston 4. is held up in its cylinder by the pressureof steam in chamber 26 pressing on the bottom of valve packing ring^.^ is made to fit as nearly air-tight as possible,in order to prevent any air from leaking into chamber d belowthe piston. The dotted circles / below the piston 4 show thedrip opening made through the body of the governor. Theobject of the drip opening is to prevent the accumulation ofany air or steam that might leak by the governor piston 4 orstem 5 of the steam valve, into chamber d. A small port t is drilled in the body of the governor just * Chamber E is cliarged to main-reservoir pressure in full releaseposition, to train pipe pressure in running position, and to 20 poundsless than main reservoir pressure in all other positions of the brake §15 THE NEW YORK AIR BRAKE. 11 below the seat 27 of the steam valve ;g5, to allow sufficient steamto pass to the pump to keep it working slowly, thus keeping itwarm and preventing condensation of steam when the pumpgovernor has closed valve 25. If the pump remains inactivefor any length of time after full train-pipe pressure hasbeen attained, steam will condense in the supply pipe. Whenthe pump starts to work, this condensation will be thrown outof the stack and over the jacket of the engine; hence, thenecessity of port t. OPERATIOX. 21. The regulating spring 10, Fig. 3, is adjusted to with-stand a pressure of 70 pounds, acting upwards againstdiaphragm 13. When the pump is in operation, the pressurein the train pipe and in chamber a of the governor increasesuntil a pressure of 70 pounds is reached. When the pressurein chamber a is slightly greater than that at which spring 10 isadjusted, the diaphragm IS is raised and opens the passa
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
