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Published on Oct 3, 2012
A zone valve is used to control the flow of water or steam in a hydronic heating system.
You want to use zone valves in heating systems where you will be heating multiple zones. When a specific zone calls for heat, the zone valve for that specific zone opens. When the zone valve completely opens, an end switch tells the circulator pump to turn on and water begins to circulate from the boiler to the space until the thermostat is satisfied. When the space reaches the selected temperature, the zone valve closes and disables the circulator.
Zone valves usually feature a setting that allows the valve to be opened manually. This can be used to help troubleshoot the heating system and, if necessary, provide temporary heat.
Zone valves are available as normally closed or normally open, in two-port and three-port body pattern, as well as in sizes ranging from 3/8" to 1-1/4".