Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 128, Air Outlet-Valve for Radi-ator. Automatically Operated byExpansion and Contractionof Vulcanite Stem. 151 1 12 ITEATIXC AND VENTILATION poud R\*bk>«». shown in section in Fig. 128, which replaces the usual hand-valve at the return end of the radiator. It is similar in construction to some of the air-\ alves already described, consisting of a rubber or vulcanite stem closing againsl a valve opening when made t<» expand by the presence f steam. When water or air fills the valve, the stem contracts and allo
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 128, Air Outlet-Valve for Radi-ator. Automatically Operated byExpansion and Contractionof Vulcanite Stem. 151 1 12 ITEATIXC AND VENTILATION poud R\*bk>«». shown in section in Fig. 128, which replaces the usual hand-valve at the return end of the radiator. It is similar in construction to some of the air-\ alves already described, consisting of a rubber or vulcanite stem closing againsl a valve opening when made t<» expand by the presence f steam. When water or air fills the valve, the stem contracts and allows it to be sucked out as shown by the arrows. A perforated metal strainer surrounds the stem or ex-pansion piece, to prevent dirt and sediment from clogging the valve. Fig. 12!) shows the valve—or thermostat, as it is called attached to an ordinary angle-valve with the top removed; and Fig. 130 indicates the method of draining the bottoms of risers or the ends of mains. Fig. 131 shows another form of this valve, called a water-seal motor. This is used under practically the same conditions as the one described above. Its action is as follows: Ordinarily, the seal .1 is down, and the central tube-valve is resting upon th
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