Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . ps around the shaft, or any other accidentthrows the valve-gear out of position, then, 1. Have some one roll the engine forward in the direction itruns until the crank is on the dead centre. 2. Open the cylinder cocks at each end. 3. Admit a small amount of steam into the steam-chest byopening the throttle slightly. 4. Eoll the eccentric forward, in the direction the engineruns, until steam escapes from the cylinder cock at the endwhere the valve should begin to open. I
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . ps around the shaft, or any other accidentthrows the valve-gear out of position, then, 1. Have some one roll the engine forward in the direction itruns until the crank is on the dead centre. 2. Open the cylinder cocks at each end. 3. Admit a small amount of steam into the steam-chest byopening the throttle slightly. 4. Eoll the eccentric forward, in the direction the engineruns, until steam escapes from the cylinder cock at the endwhere the valve should begin to open. I land Hook of Calculations. 3°1 KMERGENCY RULE FOR SETTING SLIDE VALVES. 5. Screw your eccentric fast to the shaft. 6. Roll your crank around to the next centre, and ascertain in escapes at the same point, at the opposite end of thecylinder. If so, the valve is in position for service, until anopportunity occurs to open the steam-chest and examine thevalve-gear. TO TAKE uATHS FROM THE VALVE AND VALVE This is done so that there may always be a permanent recordkept of all sizes, &c, of the valve Kg. 141. Wo will suppose that the valve is off and lying on its back on the engine room floor. Take a lath and lay \\ on the valve rad scrieve a mark al each edge of the valve faces (see e l 10), t! 11 is ;:t each Bteam and exhaust edge, next put a lath on the valve seal (Figure 139), and mark on it the . bars and exhausl port. Now laythe laths alongside each ether as in Figure ill: and see ifboth exhausl edges of the valve agree with the exhaust edgesof the steam ports, if they do, well and good, it can be hy mark- how much Bteam lap, <xc, tlare is, as well making sure thai everything is in its proper central position. jo8 Hand Book of Calculations. Steam Expa^sio^. When steam is admitted to a cylinder during a portion ofthe stroke, then cut off, and expanded in the cylinder, uponthe piston, for the remainder of the stroke, the pressure onthe piston, dur
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