. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . is long and narrow,shown in Plate 51. Over these ports is valve V, whichis usually made of cast-iron, and so constructed that by 176 VALVE MOTION. moving it forward and backward its movement will al-ternately cover and uncover the steam ports CC. Thevalve and seat are inclosed in the steam-chest (Plate 55),to which steam is admitted from the boiler through thedry pipe. Steam Exhaust. The locomotive exhausts steamfour times during one revolution of the driving w
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . is long and narrow,shown in Plate 51. Over these ports is valve V, whichis usually made of cast-iron, and so constructed that by 176 VALVE MOTION. moving it forward and backward its movement will al-ternately cover and uncover the steam ports CC. Thevalve and seat are inclosed in the steam-chest (Plate 55),to which steam is admitted from the boiler through thedry pipe. Steam Exhaust. The locomotive exhausts steamfour times during one revolution of the driving the right-hand crosshead has moved back fromforward center to nearly the middle of the guides, theleft engine is exhausting on its forward stroke. Whenthe right-hand crosshead reaches a point close to theback end of the guides, the right engine is exhaustingon the backward stroke. When the crosshead on itsreturn movement nearly reaches the middle of theguides, the left engine is exhausting on the backwardstroke, and when the crosshead nears the forward endof the guides, the right engine exhausts on the When the valve is in the position shown in Plate 52,the front steam port C is uncovered and steam is ad-mitted to the front end of the cylinder, indicated by thearrow, and forces the piston toward the back end, or inthe direction of the arrow. Plate 53 shows the valve atits extreme travel with full port opening. The opera-tion of the piston valve is similar to that of the slide-valve, except that a piston valve works in a bushing in-stead of on a flat surface. VALVE MOTION. 177
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Keywords: ., bookauthornationalcorrespondenc, bookcentury1900, bookdecade1900
