. Un libro di testo sulla locomotiva e sul freno ad aria . identico; le nostre spiegazioni, quindi, mentre alludono solo da un lato, ma si applicano ugualmente all'altro. VALVOLA TUBO TRAIX. 33. Una valvola denominata valvola del tubo del treno, utilizzata per la traina dell'alimentazione di vapore alla singola vettura, è mostrata in Fig. 11 (a). La parte indicata con a è il corpo valvola, all'interno del quale è inserita una valvola azionata dall'interno del razzo b della vettura 1)y, la piastra di pavimento c avendo segni su di essa per agire come aguide rispetto alla posizione delle valvole; d è il mandrino che aziona l'acam o l'eccentrico che agisce all'interno della valvola a pistoni
1044 x 2392 px | 17,7 x 40,5 cm | 7 x 15,9 inches | 150dpi
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. A textbook on the locomotive and the air brake . identical; our explanations, therefore, whilealluding only to the one side, yet apply equally to the other. TRAIX-PIPE VALVE. 33. A valve called the train-pipe valve, used for con-trolling the supply of steam to the individual car, is shown inFig. 11 (a). The part marked a is the valve body, inside ofwhich is a valve that is operated from inside the car l)y thesocket b, the floor plate c having marks thereon to act as aguide to the valves position; d is the spindle that actuates acam or eccentric that works inside the piston valve containedinside the body a. This spindle has a square fit inside thesocket b, and is also held by the setscrew /; the spindle d canbe turned around by means of the handle g, which is fastenedto the flange sheave h by the setscrew i. The sheave spring jis held in the arm A; and engages with a slot in the edge of h. 26 CAR HEATING. 13 The spindle d can also be turned by inserting a key in the topof the socket b, the key being shown in view (6); a downward { B. 13 CAR HEATING. 27 thrust displaces the plug I against the resistance of a springinside 6, view (a), and then the socket, p, nd with it the spindled^ can be rotated. The connection with the train pipe is madeby means of the union coupHng n. Any condensation is takencare of by the steam trap, and so water is prevented backing upinto the piping, where it could freeze and burst the pipes. Thepurpose of the train-pipe valve is to shut off the steam at thetrain pipe from all cars in the rear of that particular valve; itis not intended as a means of shutting off steam from its owncar, as it would also shut it off from all cars behind it. Thesteam is shut off from a certain car by using the steam valvesV, v, Fig. 10. When changing engines, the valve can also beoperated so as to shut in the steam already in the train. END TRAIN-PIPE VALVE. 34. On occasions when it has been found more convenientto put the train-pipe valve under the platform at t
