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Steam locomotive valve gear
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The radius hangers and transmission yokes of Southern valve gear were designed with a wide enough base at the top (especially the transmission yoke - the forward of the two vertical members) that getting out of line laterally far enough to contact the main rod was not going to be a problem. The bell crank had two horizontal members, far enough apart(one inside and one outside of the valve gear hanger) to give the necessary stability to the transmission yoke. <br /> <br />The Southern gear required a long eccentric throw because the leverage inherent in the gear reduced the eccentric motion so much that even a 6-inch valve travel required a lot of movement to work with. That long throw gave the impression at speed that the stuff was going to fly off the engine. But it seldom, if ever, did . . . <br /> <br />In Southern steam excursion's early days, I worked on both the little Consolidations - the 630 and 722 - that were equipped with Southern gear. They ran just fine. The valves were square and stayed that way. <br /> <br />Old Timer
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