. American engineer . Packing Rings.—When piston valves were first used, thevalve rings were made in accordance with the old method their grooves, and can so adjust themselves as always to be used for piston rings, which was as follows: d being thein contact with the walls and prevent any apprecialile leakage. diameter of the steam chest or cylinder; d that of grooves 633 634 AMERICAN ENGINEER. Vol. 86. Xo. 12. of the valve body or piston: c the length of cut needed toobtain the spring considered necessary; a ring was cut froma shell of suitable dimensions, whose outside and inside diam-eters,
. American engineer . Packing Rings.—When piston valves were first used, thevalve rings were made in accordance with the old method their grooves, and can so adjust themselves as always to be used for piston rings, which was as follows: d being thein contact with the walls and prevent any apprecialile leakage. diameter of the steam chest or cylinder; d that of grooves 633 634 AMERICAN ENGINEER. Vol. 86. Xo. 12. of the valve body or piston: c the length of cut needed toobtain the spring considered necessary; a ring was cut froma shell of suitable dimensions, whose outside and inside diam-eters, D and D. were as follows: cD = d + — D=: d+ — TT This ring was then faced to a width corresponding as closelyas possible to those of the grooves in the valves or having been cut, the rings were fitted to their groovesand the ends filed so as to permit of a free movement in thesteam chests or cylinders, a play of about .02 in. being leftbetween the ends for expansion along the line of the smallest. firce F/a/e Fig. 2—Turning and Boring the Shell. diameter. But all this work, which was done, for the mostpart, with a file, was long and expensive; while the ringsmade in this manner were not round, but tended to assume anoval shape as in Fig. 9, which caused constant leakages andunequal wear in the bushings and cylinders. Furthermore, thismethod was frequently very annoying, because the workmanwho made the rings was obliged to wait for the valve bodiesand piston heads to be finished in order to get the exact diam-eter and width of the grooves. In order to avoid these inconveniences, a complete changehas been made in the method of machining rings for both the 4 yarrs tor Holdii■3hell Bucking RoHer
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
