. The railroad and engineering journal . or ? Answer. The action of an injector is due to the fact that thevelocity of steam which escapes from a boiler at a given press-ure is very much greater than that of water under the same * The pet-cock is sometimes att.^ched to the feed-pipe. t Injectors are now made so that steam can be admitted through them tothe heater pipes. 176 THE RAILROAD AND [April, 1888. conditions. If water is brought in contact witli a jet of steam,the latter will impart its velocity to the water, and by mixingwith it the steam will be condensed. QuKSTlON 245. How is an inje
. The railroad and engineering journal . or ? Answer. The action of an injector is due to the fact that thevelocity of steam which escapes from a boiler at a given press-ure is very much greater than that of water under the same * The pet-cock is sometimes att.^ched to the feed-pipe. t Injectors are now made so that steam can be admitted through them tothe heater pipes. 176 THE RAILROAD AND [April, 1888. conditions. If water is brought in contact witli a jet of steam,the latter will impart its velocity to the water, and by mixingwith it the steam will be condensed. QuKSTlON 245. How is an injector constrticted? Answer. Fig. 139 represents an elementary form of an in-jector. ^ is a boiler and W a water tank. A \s z. pipe to carrysteam from the boiler to the injector, and Cone for supplyingit with water, and D another pipe to conduct the water to theboiler. The pipe A terminates in a nozzle, /■. The pipe Cterminates in a hollow cone, E, which surrounds the nozzle steam is admitted to the pipe A by opening the valve A,. it escapes from the nozzle /^and the lower end of E, and createsa partial vacuum in the cone E and in C. The water is thussucked up from the tank IV, and Hows through the pipe CintoE, where it meets the current of steam escaping Irom F. Thiscarries part of the water with it, and they escape at c. BelowE there is another tube, G, which is connected to the boiler bythe pipe D, and has a valve, H, which is raised up by the press-ure of the water in the pipe Z>, and it thus closes the lower endof C so that no water can escape from the boiler through thepipe D. It will be noticed that there is some space at e betweenthe lower end of E and the top of G. When steam is admittedto F, as has been explained, it sucks the water up the pipe Cand forces it out at e. When the stream of steam meets thewater in E the steam imparts its velocity to the water, but inmixing with it the steam is condensed so that the jet, whichescapes from E, is composed of water
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