. Railway mechanical engineer . Three Valves. Two Valves. Valve Size Sparine? 5 Radius R *k S ste 4- 8k 4i 3k 8 4% 3 7k 4% 2i Gi 3% Fig. 2 This in itself is an economy as muffled valves are usuallymore expensive than open valves. For new work, and perhaps for replacements, the spacingof valves shown in Fig. 2, which is recommended by theMaster Mechanics Association, can be used to advantage. The brass bushings shown in Figs. 3 and 4 will be foundan improvement over a pipe bushing on account of theirbetter wearing qualities. Furthermore, the valves can beremoved from the brass bushing without t
. Railway mechanical engineer . Three Valves. Two Valves. Valve Size Sparine? 5 Radius R *k S ste 4- 8k 4i 3k 8 4% 3 7k 4% 2i Gi 3% Fig. 2 This in itself is an economy as muffled valves are usuallymore expensive than open valves. For new work, and perhaps for replacements, the spacingof valves shown in Fig. 2, which is recommended by theMaster Mechanics Association, can be used to advantage. The brass bushings shown in Figs. 3 and 4 will be foundan improvement over a pipe bushing on account of theirbetter wearing qualities. Furthermore, the valves can beremoved from the brass bushing without the injury they areat times subjected to when pipe bushings are used. Thedistance between the bottom of the valves and the dome capshould be as short as possible, leaving just enough space for 3 Pipe ThreadHi/ve fnd. I 3 J>ipe Thread J Brass. Fig. 3—Bushing for 3-inch Valve the use of a hexagon wrench. A long bushing with the con-sequent vibration of the valve when it is blowing is injuriousto the valve. Fig. 4 shows a reducing bushing which canbe used when applying the smaller valves to the the valves on the road are all of a standard make, thesebushings can be carried in stock threaded, otherwise theyshould be left blank and threaded to suit the dome cap andvalve as required. Safety valve springs are usually designed to carry a pres-sure of 10 lb. under or over the pressure stamped upon them,although some manufacturers allow a variation of IS is, therefore, important that the shops not only comparethe size of valve with the above mentioned drawing butalso compare the spring capacities. This is most important when changing valves from one engine to another. It is sug-gested that springs at ISO lb., 170 lb., 190 lb. and 210 lb. becarried in stock as standard rather than carryi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
