Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . apid wearing of the unbalanced Allen valve, and forthe trouble and expense of constantly refacing valvesand seats, and the loss of the steam blown through:leaky valves quite offsets the advantages gained by areduction of wire-drawing. These manifest disadvantages are entirely overcomeby a proper balancing of the valve, which secures allof the advantages of the Richardson device, plus anincreased steam economy resulting from using theAl
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . apid wearing of the unbalanced Allen valve, and forthe trouble and expense of constantly refacing valvesand seats, and the loss of the steam blown through:leaky valves quite offsets the advantages gained by areduction of wire-drawing. These manifest disadvantages are entirely overcomeby a proper balancing of the valve, which secures allof the advantages of the Richardson device, plus anincreased steam economy resulting from using theAllen ports. To secure the best possible results from the employ- i88 LOCOMOTIVE ENGINEERING ment of the Allen balanced valve, its ports and bridgesshould exceed the full travel of the valve by at leastone-eighth of an inch, and the radius of the link shouldalways be as long as permissible to escape an excessiveincrease of lead when cutting off early in the stroke. The Young Valve and Gear. During the past fouryears there has been brought to the front a valvewhich, while not a balanced valve in the ordinaryacceptance of the term, as applied to locomotives,. iwvertheless gives or appears to give as good adistribution of the steam as either the balancedsi de valve or the piston valve, while at the same timeit^ operation is accomplished with a minimum of fric-tion and strain on the valve gear. This is the Youngvalve and gear, the invention of Mr. O. W. Young ofChicago. The results obtained by the practical use ofthis valve on one of the engines of the Chicago &Northwestern Railway, especially during the past PISTON VALVES AND BALANCED VALVES 189 year, seem to warrant the conclusion that it has many;meritorious features, and that a bright future liesbefore it. A general idea of the construction of the valves, andthe wrist plate by which they are operated, may be^obtained by reference to Fig. 94, which is a sectionallelevation showing the steam and exhaust ports, and asectional view o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
