. The science of railways . port L (see also Fig. 154), live steam is admittedto L and thence to the low-pressure cylinder, as in-dicated by the arrows. As w^e assumed the engi-neer had not opened the separate exhaust valve, itwill remain closed instead of open, as Fig. 152 show^sit; otherwise that figure would show the valve posi-tions at this stage. Thus, while the receiver B is in 17 vol 13 250 ENGINEERS AND FIREMENS MANUAL. communication with the cavity V, there is nooutlet from the latter, and one or two exhaustsfrom the high-pressure cylinder into the closedreceiver B will produce suihci
. The science of railways . port L (see also Fig. 154), live steam is admittedto L and thence to the low-pressure cylinder, as in-dicated by the arrows. As w^e assumed the engi-neer had not opened the separate exhaust valve, itwill remain closed instead of open, as Fig. 152 show^sit; otherwise that figure would show the valve posi-tions at this stage. Thus, while the receiver B is in 17 vol 13 250 ENGINEERS AND FIREMENS MANUAL. communication with the cavity V, there is nooutlet from the latter, and one or two exhaustsfrom the high-pressure cylinder into the closedreceiver B will produce suihcient pressure to actagainst the larger left-hand face of the inter-cepting valve G and cause it to move to the left,shoving with it and closing the reducing valve,as shown in Fig. 153. Now the receiver pressurebecomes the supply for the low-pressure cylinderas shown by the arrows, and the engine workscompound thereafter. The engine will start allordinary trains in this manner but if the train. to be started is a very heavy one, or such a trainis threatened with stalling while ascending aheavy grade, the handle of the three-way cockin the cab should be turned to open the separateexhaust valve E. This would vent the pressurein chamber JJ to the main exhaust C, as indicatedby the arrows in Fig. 152. If the engine werestarting, no pressure could accumulate in the re-ceiver B on account of this vent to the atmosphere,and hence all valves would remain as in Fig. 152and the engine would continue to work simpleuntil such time as the engineer closed the separate OPERATIOX OF COMPOUXD LOCO}rOTIVES. 251 exhaust valve E by means of his cab valve. If,however, the engine were stalling working com-pound (Fig. 153) and the engineer opened the ^^^. /SS.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
