. Farm machinery and farm motors. FIG. 228- -INDEPENDENT PLUNGERPUMP acting (Marsh) pump, andthe independent phingerpump (Figs. 226, 22^, and228). The crosshead typeis the simplest and mosteconomical, but can be run C-^*^)f^\ //W4l\w\^ °^^ when the engine isK/^JmAl/nX^vX running. The Marsh inde-pendent pump is simple andeconomical, but the actionof its steam valve is deli-cate andshould be molestedonly by an expert. The in-dependent plunger pump isvery satisfactory in that itcan be run at any time and by any one. The initial costof this is more than thatof other types. 453. The injector i spro
. Farm machinery and farm motors. FIG. 228- -INDEPENDENT PLUNGERPUMP acting (Marsh) pump, andthe independent phingerpump (Figs. 226, 22^, and228). The crosshead typeis the simplest and mosteconomical, but can be run C-^*^)f^\ //W4l\w\^ °^^ when the engine isK/^JmAl/nX^vX running. The Marsh inde-pendent pump is simple andeconomical, but the actionof its steam valve is deli-cate andshould be molestedonly by an expert. The in-dependent plunger pump isvery satisfactory in that itcan be run at any time and by any one. The initial costof this is more than thatof other types. 453. The injector i sprobably the most gen-erally used means o ffeeding boilers. It wasinvented in 1858 by , and large num-bers of the same typesare still made. The ac-tion of the injector willbe understood by refer- (J^^ering to the sketch(Fig. 229). Steam istaken from the boilerand passes through thenozzle A to the injector; ,, 1. r i. • FIG. 229—PRINCIPLE OF THE the amount 01 steam is injector. STEAM BOILERS 333 regulated by the valve B. In the tube C the steam iscombined with the slowl}^ moving water, which is drawnup from the tank D. The swiftly flowing steam putssufficient momentum into the water to carry it into theboiler. The delivery tube E has a break in it at F wherethe surplus steam or water can overflow. An injector should 1)e chosen with reference to thespecial work required of it. Some will lift water, otherswill not. Some will start under low-pressure steam and ST£AM
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