Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives (1916)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co., pub. for Sears, Roebuck & co. · leaf 188
ring sur-ace is never sufficient to secure its wearing well under1 heavy steam pressure; and this wearing surface isret further reduced in the Allen valve, owing to itsinternal steam ports. This internal passage actuallydivides the valve into two parts, and the steam pres-iure, acting on the outer… … Figure 90 Figure 91 side lap of the valve, and this fully accounts for therapid 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…
Locomotives
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