. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rod is hollow to receive the reversing valve usual tappet plate is bolted to thehigh pressure steam piston head to movethe reversing valve rod and reversingvalve up and down, as in the 9< The stroke of the pistons is 12ins. The operation of the pump is as fol-lows: Referring to Fig. 2, the highpressure steam piston is shown, as in-dicated by the arrows, making its upstroke. Steam from the boiler enters thepump at passage a and flows into thetop head filling the chambers su
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rod is hollow to receive the reversing valve usual tappet plate is bolted to thehigh pressure steam piston head to movethe reversing valve rod and reversingvalve up and down, as in the 9< The stroke of the pistons is 12ins. The operation of the pump is as fol-lows: Referring to Fig. 2, the highpressure steam piston is shown, as in-dicated by the arrows, making its upstroke. Steam from the boiler enters thepump at passage a and flows into thetop head filling the chambers surround-ing both the small reversing slide valve22, and the main slide valve 72. Theposition of reversing slide valve 22 is such that livij, steam is also free to passinto port n, which leads around to thechamber behind the larger main slidevalve piston 26, so that the pressures onboth sides of this piston may becomeequal. Hence the smaller main slidevalve piston 28, having boiler pressureon one side and atmospheric pressureon the other, is able, under the condition of piston 26, to move. FIG. 1. H;-INCH CRo,-,^ ,( M) ilMP. the main slide valve 72 to the positionshown, and admit steam through port k,in this slide valve, and port and pas-sage g in the walls of the high pressuresteam cylinder to the lower side ofpiston 7 and cause it to move in thedirection shown. The steam which had previously beenused on the down stroke is indicatedby the arrows as flowing through portf, in the top head, to ports h and b. inthe main slide valve, through port din the top head of the low pressure cyl-inder, to the upper side of the low pres-sure steam piston 8, causing it to moveon its down stroke. It might be well to remark here that 37S RAILWAY AND LOCOMOTIVE ENGINEERING August, 1906. as one piston goes up the other goesdown, and vice versa. When piston 7 nears the end of itsup stroke, tappet plate iS engages thereversing valve rod 21, and the latter,together with the reversing
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
