. Electric railway review . \> perature of the discharge changes. Con-trolling the quantity of injection by thevacuum is very uncertain and undesirable. 11 as it is evident that if leaks should occur is i £ or for anv other reason, such as the con- denser becoming air-bound, the vacuum drop, the quantity of injection would be abnormally increased, resulting in too low a temperature of the tail water and a waste of power in the circulating pump, as the extra supply of injection is useless. A thermostatic regulator for controlling the quantity of the injection water is shown in Fig. 263-(I3-2
. Electric railway review . \> perature of the discharge changes. Con-trolling the quantity of injection by thevacuum is very uncertain and undesirable. 11 as it is evident that if leaks should occur is i £ or for anv other reason, such as the con- denser becoming air-bound, the vacuum drop, the quantity of injection would be abnormally increased, resulting in too low a temperature of the tail water and a waste of power in the circulating pump, as the extra supply of injection is useless. A thermostatic regulator for controlling the quantity of the injection water is shown in Fig. 263-(I3-2). The regulator, as will be seen, consists of an expansion tube which is permanently attached to a point near the lower end of the tail pipe and attached to the injection valve by an adjusting screw which permits the regulator to be adjusted. The length of the tube is so chosen that it will give the desired travel to the valve a higher coefficient of expansion than the temperature of the injection water of the copper tube. Figure 263-(13-2). Figure 262-(l3-1). lines would be very slight, in fact they may be under vacuum,t! is being determined by the style of the condensers and therelative elevations of the line with respect to the cast-iron pipe is very suitable for this service, butspecial provision must be made for the expansion and con-traction with changes of temperature. Valves should beplaced in each branch and should also be located along themain so that each condenser unit may be isolated, togetherwith its pumps, as shown in Fig. 262-(I3-l). By arranging lines in this manner, it is possible to shutdown any portion of the main to make repairs and permitthe remaining portion to operate without interruption. Thesize of the main required is only that required for one con- As copper hascast iron, as becomes too high, the lengtheningincreases the opening through the injection valve, which ad-mits more water and constantly lowers the temperature ofthe inject
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