Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 208
s by means of the special regulat-ing valve on each; absolute safety; smallpipes; absence of air-valves. Mercury Seal Vacuum Systems. Inone of these systems, commonly usedwith gravity-return apparatus, air-valves similar to those shown inFig. 55 are placed on the radiators, and the air-lines… … Fig. 49. Iron Body Globe Valve. 172 STEAM .\ND HOT WATER FITTING 39 rnising the steam pressure. In another mercury seal system, air-valves are omitted and retarders—so called—are placed at thereturn ends of radiators. With a tight job of piping when the air in the system has oncebeen got rid of,…
Architecture · Building · Carpentry
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