Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Figure 59 The object of giving a valve lead is that the steamport may be opened slightly for the admission of livesteam just before the piston reaches the end of itsstroke, in order that there may be a cushion of steamto receive the piston and reverse its motion at the end. Figure 60 ^f the stroke, thus making the engine quicker in itsaction. Lead increases on a locomotive as the cut-off13 made earlier or shorter, which is done by brin
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Figure 59 The object of giving a valve lead is that the steamport may be opened slightly for the admission of livesteam just before the piston reaches the end of itsstroke, in order that there may be a cushion of steamto receive the piston and reverse its motion at the end. Figure 60 ^f the stroke, thus making the engine quicker in itsaction. Lead increases on a locomotive as the cut-off13 made earlier or shorter, which is done by bringingthe reverse lever nearer the center notch of the quad-rant. The increased lead is caused by the radius of VALVES AND VALVE GEAR 125 the link. This will be explained later on, towards theclose of this chapter. The term valve gear, as applied to a locomotive,includes eccentrics, rods, links, rockers, etc., by whichthe valves are given motion and by which their move-ments are regulated and controlled. As it is very. necessary that a locomotive should be capable of beingmoved by steam either backward or forward, a revers-ible valve-gear is required. Various devices have beeninvented for this purpose, but the shifting link motionhas, after many years trial, been found to be the mostreliable and best and is to-day the standard in this\ country. Fig. 61 shows a general view of the valve gear ofi one side of a locomotive. The c
Size: 2579px × 969px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
