Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules (1908)
National correspondence school of railroading, Chicago. [from old catalog] · [Chicago] · leaf 190
PLATE S6.Double Cone American Ba/ancera/ve. The hole D is drilled through the top of the valveto allow any steam passing by the strips or rings toescape to the exhaust, without destroying the balancefeature of the valve. The Allen Ported Valve. With the plain slide-valve it has been found difficult… … PLATE 57. This valve has a supplementary port AA supplyingsteam to one steam port from both sides of the valve atthe same time, thus giving double port opening forthe same travel of the valve, and an increase of steampressure in the cylinder. This valve has given excellent i8o VALVE MOTION.…
Locomotives
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