Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . f the packing strips andspring, the only alteration being the addition of thebalance plate, PP, Fig. SS, and the substitution of avalve adapted to receive the packing strips S, 5. S, S. It will be noticed in this instance that the balanceplate is bolted to the cover of the steam chest, butthese maybe cast in a single piece. The four sectionsof packing enclose a rectangular space, R, Fig. 90,which equals in its area the total amount of
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . f the packing strips andspring, the only alteration being the addition of thebalance plate, PP, Fig. SS, and the substitution of avalve adapted to receive the packing strips S, 5. S, S. It will be noticed in this instance that the balanceplate is bolted to the cover of the steam chest, butthese maybe cast in a single piece. The four sectionsof packing enclose a rectangular space, R, Fig. 90,which equals in its area the total amount of valve sur-face which is to be relieved of excess pressure, thepacking strips preventing the steam from entering PISTON VALVES AND BALANCED VALVES i$»j his space, and the small hole X, communicating withhe exhaust cavity in the valve, relieves space R frommy possible accumulation of pressure. The four packing strips consist of two longer ones,vhich are simply rectangular pieces of cast iron, while[he two shorter ones, Fig. 91, have gib-shaped ends to-etain them in their proper position. Beneath eachracking strip a light elliptic spring, shown in Fig. 91,. Figure 88 is placed which holds these strips in position againstthe balance plate when steam is shut off. In operation these different sections maintain a steam-tight contact, by a direct steam pressure, with thebalance plate and with the inner surfaces of thejgrooves provided to receive them, the joint beingsecured by the abutting of the ends of the two longersections against the inner surfaces of the gibbed sec-tions at the four corners. The Allen-Richardson Balanced Slide Valve. TheAllen valve is designed to at least partly prevent thewire-drawing of the steam, when high speeds are i86 LOCOMOTIVE ENGINEERING maintained with the valve cutting off early in thestroke. In the Allen valve, an additional passage for the jinlet of steam is furnished, as will be clearly seen byreferring to Figs. 92 and 93. These are transverse andl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
