gh the valve. (3) As soon asthe water that has caused it to close drops away.it opens without spitting. (4) It closes instantly if steam reaches it. (5) If pressuregoes off, the valve instantly and automatically closes against the intake of air into the radiator through the valve. (6) It ventsall… … Exterior View. Sectional View. No. 2 Hofpman Siphon Air and Vacuum Valve, No. 3 Hoffman Air Line1 Valve—Designed for drip line or vacuum air line service.closes against steam. It has a ^6-in. male thread and a J^-in. female thread on the union. No. 4 Hoffman Junior Quick Vent Air Valve—Designed…
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