Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . in the boiler, and for a fixed temperature of the feedwater. In practice however these quantities vary, and injectorsmust be made to suit all such contingencies. For instance,when the pressure of the steam increases, the area in theopening of the steam nozzle must be increased and when thepressure decreases it must be made smaller. There are very many forms of injectors. Fig. 109 illustratesone which is in quite common use. The steam andwater supply pipes, nozzle and co
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . in the boiler, and for a fixed temperature of the feedwater. In practice however these quantities vary, and injectorsmust be made to suit all such contingencies. For instance,when the pressure of the steam increases, the area in theopening of the steam nozzle must be increased and when thepressure decreases it must be made smaller. There are very many forms of injectors. Fig. 109 illustratesone which is in quite common use. The steam andwater supply pipes, nozzle and cone are rendered sufficiently-clear by the drawing. The steam supply is varied by alteringthe position of the conical spindle a, which can be screwedtowards or away from the mouth of the nozzle. The water chamber CG is so arranged that it completelysurrounds the steam nozzle. The supply of the water is variedby contracting or expanding tbe conical aperture below themouth of the steam nozzle. This is accomplished by movingthe conical sliding tube E backwards or forwards by means ofthe handwheel D and the rack and Hand Book of Calculations. 211 INJECTORS. If the supply of steam is notproperly adjusted to the water,some of the latter will eseape at theaperture made in the sliding tubeE into the overflow pipe. Forinstance, if the supply of steam betoo small, the current will not havesufficient energy to enter the boiler,part of it will choke up the slidingtube and escape by the this occurs it is only neces-sary to turn on more steam or shutoff some of the water. The efficiency of the injector ismeasured by the temperature of thecurrent of feed water as it entersthe boiler, compared with its tem-perature before it entered the in-jector. The less the rise in tem-perature, the more the energy ofthe Bteam is utilized. Injectors are also used for otherpurposes besides feeding are used to pump out cisternsand drain basins and have evenserved to pump out
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