. Cyclopedia of architecture, carpentry, and building : a general reference work. off the tops of the mains and returnpipes connected to the return mains in a like manner. (Fig. 65.) Asthis system depends upon the force of gravity to keep up its circula-tion an expansion tank (Fig. G6) must be provided, high enoughabove the highest radiator to insure free circulation, and the pipesshould be run so that any radiator may be shut off without interferingwith the general circulation. This tank should be supplied with a 78 BUILDIXG SUPERINTENDENCE 71 glass gauge and an overflow to some convenient pl
. Cyclopedia of architecture, carpentry, and building : a general reference work. off the tops of the mains and returnpipes connected to the return mains in a like manner. (Fig. 65.) Asthis system depends upon the force of gravity to keep up its circula-tion an expansion tank (Fig. G6) must be provided, high enoughabove the highest radiator to insure free circulation, and the pipesshould be run so that any radiator may be shut off without interferingwith the general circulation. This tank should be supplied with a 78 BUILDIXG SUPERINTENDENCE 71 glass gauge and an overflow to some convenient place, and an openvent pipe should be taken from the top. The connection from theheating system enters at the bottom and an automatic connectionshould be made with the main water supply. A water connectionshoidd also be made at the heater to be used when the system is firstfilled, as by this means the air is driven upward and dischargedthrough the vent on the tank. The expansion tank should l>e large enough to contain a gallonof water for every forty square feet of Fig. 65. Piping for Hot Watei Heating. Valves. Special valves are made for use with hot water radia-tors, the main advantage being a device for quick closing, a half turnbeing usually sufficient to open or close the valve. Connections withthe radiators may be made at the top or bottom, the return pipe beingalways at the bottom. Only one valve is necessary to stop the flowof water through the radiator and this is put on the supply pipe, thereturn connection being made by a union elbow. The ordinary pet cock is generally used for an air valve, butthere are several forms of automatic valves which are operated bya float which allows the air to escape when the water line is loweredbut closes upon the flowing in of the water. 79 72 BUILDING SUPERINTENDENCE
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