. The steam-engine and other heat-motors. s circulating water is often called injection-water asit enters the condenser, and is called discharge-water as it condensed steam is called feed-water, and the feed-pump isthe one that is used to force it into the boiler. Hot feed-watermust never be lifted by the pump, as the pump-chamber will fillwith vapor on the suction-stroke, and the requisite pressure willnot be obtained on the delivery-stroke to force the water into theboiler. 26 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. Jet Condenser.—Fig. 17 represents a jet condenser and its air-pum
. The steam-engine and other heat-motors. s circulating water is often called injection-water asit enters the condenser, and is called discharge-water as it condensed steam is called feed-water, and the feed-pump isthe one that is used to force it into the boiler. Hot feed-watermust never be lifted by the pump, as the pump-chamber will fillwith vapor on the suction-stroke, and the requisite pressure willnot be obtained on the delivery-stroke to force the water into theboiler. 26 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. Jet Condenser.—Fig. 17 represents a jet condenser and its air-pump. This is an old form that is rather uneconomical of space,but it illustrates the principles clearly, which is important. Theexhaust-steam enters the condenser by the pipe just above thewater-jet. The injection water and steam come into actual con-tact and assume a common temperature. The air-pump in thiscase is vertical (which is desirable) and contains three large cir-cular valves. These are made of hard rubber, are held fast in the. center, and are bent up in a saucer shape with an excess of pres-sure on the bottom side. The duty thrown on one valve shouldbe distributed among several valves. The lowest is the foot-valve, the one in the piston is a bucket-valve, and the top one isthe deli very-valve. Raising the piston reduces the pressure in thespace between it and the foot-valve. If the condenser pressureis greater than this, the foot-valve rises and water and more orless air or vapor enters the air-pump. The air passes through thewater so that when the piston descends the former passes firstthrough the bucket-valves of the piston. The water passingthrough last serves to seal the valves and fill the clearance small modern jet condenser is shown in Fig. 18. ELEMi:\TARY PRIXCIPLES. 27 The Bourdon Gage (Fig. 19).—This gage is used to indicatepressures. These are indicated on a marked dial by the move-ment of a hand. The latter receives its motion through
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