Modern locomotive engineering, with questions and answers .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co · leaf 168
? 261. How may the minimum port opening andminimum valve travel be found? CHAPTER VI PISTON VALVES AND BALANCED VALVES Hitherto the plain D slide valve alone has been con-sidered in the discussion of the subject of valves andvalve setting. There are, however, many other types of valves inuse on… … Figure 69 The principal objection to the use of the D slidevalve is the large amount of friction caused by theaction of the steam pressing the valve against its seat,and inventors have racked their brains for many yearsin efforts to produce a valve that would work withoutfriction, and at the same…
Locomotives
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