. Reliable vacuum and vacu-vapor heating equipment . l to the boiler pressure, thecondensation passes into boiler. The float balllowers with the condensation, which permits theair valve to again seat itself and thereby preventair getting back into the system. There being noair resistance in the returns, the condensationalways flows back to the boiler freely. The 4 V Vacu-Vapor Vent Valve is sub-stantially made, and will give many years ofsatisfactory service. The body is heavy iron, gal-vanized inside and out, so it cannot rust. It iscast in two pieces, securely fastened together withbrass cap
. Reliable vacuum and vacu-vapor heating equipment . l to the boiler pressure, thecondensation passes into boiler. The float balllowers with the condensation, which permits theair valve to again seat itself and thereby preventair getting back into the system. There being noair resistance in the returns, the condensationalways flows back to the boiler freely. The 4 V Vacu-Vapor Vent Valve is sub-stantially made, and will give many years ofsatisfactory service. The body is heavy iron, gal-vanized inside and out, so it cannot rust. It iscast in two pieces, securely fastened together withbrass cap screws, having a washer between. Thevalve and valve seat are solid bronze. They areeasily accessible, and are renewable. The valveis equipped with a composition seat, which alwaysinsures tight seating. The composition float ballis not affected by the hot condensation. The venting capacity of the 4 V Valve is 5000square feet of direct radiation. The inlet connec-tion is 1 inch; the outlet connection % inch. Seventy-One DETAILED DESCRIPTTCVACU-VAPOR. Refer to detailed chart, showing the Vacu-Vapor Equipmenlused with a two pipe steam plant, fed from low pressure boiler. The boiler, boiler connections and supply piping are th<same as for an ordinary steam plant. The return piping ismaller, the sizes depending on amount of radiation, and igraded toward boiler. The end of the dry return should be ahigh above the boiler wTater line as possible. A Vacu-Trap is placed on return end of each radiator, amconnected with return piping leading to boiler. A Vacu-GraduatPackless Valve is placed on supply end of each radiator, and connected with steam supply piping. The end of the steam main amend of the dry return are dropped to wet return, as shown o:chart. A 4 V Vacu-Vapor Vent Valve is installed on end cdry return. The outlet of the 4 V valve is usually pipeinto a flue or chimney, in order to carry off the foul air. Icase of necessity the air can be discharged into the bas<ment. A Vac
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