. American engineer and railroad journal . with narrow rings, theouter ones of which are set in from the ends of the valve, andthese are reported by those interested in them to be workingsatisfactorily; but it is believed that practice, as far as theproper distribution of the steam and the providing of the nec-essary wearing surface are concerned, has shown the desira-bility of wide rings, whereas the question of properly balanc-ing the valve will require narrow rings, the limiting point ofthe latter being the discarding of the rings entirely. Having shown the causes which lead to the use of w
. American engineer and railroad journal . with narrow rings, theouter ones of which are set in from the ends of the valve, andthese are reported by those interested in them to be workingsatisfactorily; but it is believed that practice, as far as theproper distribution of the steam and the providing of the nec-essary wearing surface are concerned, has shown the desira-bility of wide rings, whereas the question of properly balanc-ing the valve will require narrow rings, the limiting point ofthe latter being the discarding of the rings entirely. Having shown the causes which lead to the use of wide rings,it will be interesting to follow the effects of their use on thebalancing of the valve. There is shown in Fig. 3 the sectionof a piston valve which has been used in a number of locomo-tives for both freight and passenger service, and which proba-bly illustrates the extreme practice in the use of wide these valves first went into service it was reported thatthey were giving entire satisfaction and that the valves were. ^ lOe- *|
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
