Cyclopedia of heating, plumbing and sanitation; a complete reference work . J Fig. 64. Adjustable Die and Stock. erly designed, works the easiest of any, and should be used in prefer-ence to other types when radiators are placed but little above thewater line in the boiler. Air-Valves. Numerous patterns of air-valves are on the market,some, like Fig. 55, in a general way, being fitted with a union for air-line connections leading to a convenient point of discharge in the base-ment Such valves prevent the escape of steam, because of the ex-pansion of the composition pVig, which closes the openi
Cyclopedia of heating, plumbing and sanitation; a complete reference work . J Fig. 64. Adjustable Die and Stock. erly designed, works the easiest of any, and should be used in prefer-ence to other types when radiators are placed but little above thewater line in the boiler. Air-Valves. Numerous patterns of air-valves are on the market,some, like Fig. 55, in a general way, being fitted with a union for air-line connections leading to a convenient point of discharge in the base-ment Such valves prevent the escape of steam, because of the ex-pansion of the composition pVig, which closes the opening when steam 269 Hi STEAM AND IIT WATER FITTING comes in contact with it. Air and cold water, however, are permittedto escape. The general type of air-valve shown in Fig. 56 is frequently used,many modifications of this valve having been manufactured. These. Fig. 65. Adjustable Die and Stock. valves, as a rule have no air-line connections, but discharge their airinto the rooms; a somewhat objectionable feature. They close whensteam enters them; and if water finds its way in, the float is raised andcloses the outlet. Air-valves for direct radiators have a very small opening for the
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