Cyclopedia of heating, plumbing and sanitation; a complete reference work . vesshould always be used in connection withhot-water piping, although angle-valves maybe used at the radiators. There are severalpatterns of radiator valves made especiallyfor hot-water work; their chief advantagelies in a device for quick closing, usually aquarter-turn or half-turn being sufficient toopen or close the valve. Two different designs are shown in and 102. It is customary to place a valve in only one connection, as that issufficient to stop the flow of water through the radiator; a fittingknown as
Cyclopedia of heating, plumbing and sanitation; a complete reference work . vesshould always be used in connection withhot-water piping, although angle-valves maybe used at the radiators. There are severalpatterns of radiator valves made especiallyfor hot-water work; their chief advantagelies in a device for quick closing, usually aquarter-turn or half-turn being sufficient toopen or close the valve. Two different designs are shown in and 102. It is customary to place a valve in only one connection, as that issufficient to stop the flow of water through the radiator; a fittingknown as a union elbow is often employed in place of the second valve.(See Fig. 103.) Air=Valves. The ordinary pet-cock air-valve is the most reliablefor hot-water radiators, although there are several forms of auto-matic valves which are claimed to give satisfaction. One of theseis shown in Fig. 104. This is similar in construction to a steamtrap. As air collects in the chamber, and the water-line is lowered,the float drops, and in so doing opens a small valve at the top of the. Fin. 101. Radiator Valve forHot-Water Work. 119 no HEATING AND VENTILATION chamber, which allows the air to escape. As the water flows in to takeits place, the floal is forced upward and the valve is closed. All radiators which arc supplied by risers from In-low, should beprovided with air-valves placed in the topof the last section at the return end. Ifthey arc supplied by drops from an over-
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