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 93
is forced higher and steam is admittedinto the well faster than it can escape through the pass-ages in the arms, and its pressure rapidly accumulatesunder the inner seat. This pressure acting upon an addi-tional area overcomes the increasing resistance of theregulating spring and forces the valve… … PLATE 15.CROSBYS POP SAFETY VALVE. SAFETY-VALVES. 83 The valve gradually settles down until the area of theopening into the well is less than the area of the aper-tures in the arms, and the valve promptly closes. Directions for Adjusting. Adjust the head bolt L,which compresses the spring, upward…
Locomotives
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