. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . VALVE MOTION. 175 thence through the steam pipes E to the steam passageF in the cylinder saddle and to steam-chest G. Whenthe port is uncovered by valve H for the admission ofsteam to the cylinder, the piston is forced to the oppo-site end, thus transmitting its power to the crossheadand main rod, thence to the pin, wheel and rail, and fromthe journal and eccentric to the valve motion, giving theforward and backward motion to the valve, shutting offthe admissio
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . VALVE MOTION. 175 thence through the steam pipes E to the steam passageF in the cylinder saddle and to steam-chest G. Whenthe port is uncovered by valve H for the admission ofsteam to the cylinder, the piston is forced to the oppo-site end, thus transmitting its power to the crossheadand main rod, thence to the pin, wheel and rail, and fromthe journal and eccentric to the valve motion, giving theforward and backward motion to the valve, shutting offthe admission of steam to the cylinder and opening theexhaust port J just before the piston has completed itsstroke. The steam then passes out through the same steamport H through which it entered, either by the end ofthe inside admission piston valve, or through the ex-haust cavity I to the exhaust passage J, through exhauststand K and nozzle L, through petticoat-pipe M, andsleeve N, if used, to the stack O and out to the PLATE SI Steam Admission. Steam is admitted to the steam-chest through two channels AA (Plate 51), called steampassages, which are cast in the cylinder. These pas-sages terminate in a smooth flat surface BB called thevalve-seat. The openings CC are the steam ports. Be-tween them is another cavity D, called the exhaust cav-ity, and the exhaust arch E is directly over the exhaustcavity D. The shape of these ports 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
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Keywords: ., bookauthornationalcorrespondenc, bookcentury1900, bookdecade1900
