Cyclopedia of heating, plumbing and sanitation; a complete reference work . ed of a layer ofiron or steel and one of brass soldered or brazed together. Theaction of the valve is as follows:when the radiator is cold and filledwith air the valve stands as shownin the cut. When steam is turne 1on, the air is driven out throughthe opening B. As soon as thisis expelled and steam strikes thestrip D, the two prongs springapart owing to the unequal ex-pansion of the two metals due tothe heat of the steam. Thisraises the spindle C, and closesthe opening so that no steam canescape. If air should collect
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ed of a layer ofiron or steel and one of brass soldered or brazed together. Theaction of the valve is as follows:when the radiator is cold and filledwith air the valve stands as shownin the cut. When steam is turne 1on, the air is driven out throughthe opening B. As soon as thisis expelled and steam strikes thestrip D, the two prongs springapart owing to the unequal ex-pansion of the two metals due tothe heat of the steam. Thisraises the spindle C, and closesthe opening so that no steam canescape. If air should collect inthe valve, and the metal stripbecome cool, it would contract,and the spindle would drop andallow the air to escape through B as before. E is an adjusting nut. F is a float attached to the spindle,and is supposed, in case of a sudden rushof water with the air, to rise and close theopening; this action, however, is some-what uncertain, especially if the pressureof water continues for some time. There are other types of valves actingon the same principle. The valve shown. Fig. 43. Radiator Automatic Air-Valve. Operated by Metal Strip I). Consisting of Two Pieces of Metal of Unequal Expansive Power.
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