. Revised and enlarged ed. of the science of railways . ^Sec/Zon. Force Pump.—Water Is drawn from the tankinto the cylinder through a valve which closesimmediately when the motion of the plunger isreversed; at the same time another valve isopened through which the water is forced intothe boiler. boiler wdth water, but as theyare now rarely, ifever, used, an ex-planation of themhere is unneces-sary. A checkvalve is usuallyplaced at the endof the pipe wherethe w^ater entersthe boiler. Itsto prevent a ])ack £/ei^<3//on. P/en. Check Valve, for prevent-ing water from returning. object is Lo prev
. Revised and enlarged ed. of the science of railways . ^Sec/Zon. Force Pump.—Water Is drawn from the tankinto the cylinder through a valve which closesimmediately when the motion of the plunger isreversed; at the same time another valve isopened through which the water is forced intothe boiler. boiler wdth water, but as theyare now rarely, ifever, used, an ex-planation of themhere is unneces-sary. A checkvalve is usuallyplaced at the endof the pipe wherethe w^ater entersthe boiler. Itsto prevent a ])ack £/ei^<3//on. P/en. Check Valve, for prevent-ing water from returning. object is Lo prevent aflow of w^ater from the boiler,the valve being closed auto-matically by the water pres-sure in the boiler. The boiler is fed and the sup-ply regulated according to theamount of work being done by 80 RAIL^YAY EQUIPMENT. the engine. If the water m the boiler is too high,the steam space is thereby diminished and moreor less water is carried into the cylinders with thesteam. The strain thus produced by the move-ment of the piston is liable to break the cyli
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