Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . es just as it reachesthe top, the valve is forced to its seat and held thereby the compression of the air on top of it, and if thevalve has too much lift the pound heard when thevalve is seated is great in proportion. When the piston starts on the down-stroke it com-presses the air higher and higher as it nears the bot-tom, and when the pressure in the pump becomesgreater than that in the main reservoir, the lower dis-charge valve, 32,
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . es just as it reachesthe top, the valve is forced to its seat and held thereby the compression of the air on top of it, and if thevalve has too much lift the pound heard when thevalve is seated is great in proportion. When the piston starts on the down-stroke it com-presses the air higher and higher as it nears the bot-tom, and when the pressure in the pump becomesgreater than that in the main reservoir, the lower dis-charge valve, 32, is forced up and the air from thepump rushes into the main reservoir, until the valve i*seated by the main reservoir pressure becoming greaterthan that in the pump. The action of the top receiving and discharge valvesis the same as the lower ones, except on the oppositestroke. The 9^-Inch Air Pump. The cut, Fig. 225, is a sec-tional elevation of the 9^-inch pump, and for pur-poses of explanation is subdivided into Sections 1, 2and 3. The 9^-inch pump differs from the 8-inch pump it!several ways. In the first place it is larger by 1% AUTOMATIC AIR BRAKES. Figure 225Nine and One-half Inch Pump—See page 520. .. 52o . LOCOMOTIVE ENGINEERING inches in the bore; second, the valve motion of thesteam end is all contained in the top head, except thereversing valve stem, which is the same as in the8-inch pump; third, the air valves are all the samesize, and all have the same lift of /g-inch, and thevalves are placed so that the discharge valves are bothon one side, and the receiving valves on the oppositeside-of the air cylinder; fourth, there is but one airinlet for the receiving valves, making it possible tostrain all the air through one strainer^ as indicated by106, Sec. I. The main piston is the same in construc-tion as in the 8-inch pump; there are two heads, 67, onone piston rod, 65, and this rod is hollow to admit thestem, 71, of the reversing valve, 72, and the reversingvalve
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
