Locomotive breakdown questions answered and illustrated (1907)
Wallace, W. G · Chicago, F. J. Drake & Co. · leaf 108
ld run equally as, fast as the other. The valve gear simply gives the valveits movement for the admission and exhaust of steamto and from the cylinders, and on like engines the onlydifference would be the friction of the gear in this case. 135. The Allen Ported Valve.—Describe anAllen ported valve… … vantages are to admit steam to the same cylinder steamport from both sides of the valve at the same time whichwill permit a smaller amount of lead opening than by the*D valve. The Allen valve will give twice as muchopening for the admission of steam at a short cut-off asthe ordinary valve, and is…
Locomotives
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