What are zone control valve controlled by? ...

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Answers:    A thermostat. Zone control valves are used surrounded by place of individual circulater pumps. When a therm. calls for bake in a hard to please zone, the common circ.turns on and the zone stopcock for that area open.
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Zone valves are controlled by individual thermostats (or humidistats if system is set up for zone humidification control) surrounded by each zone.
The conception behind zone control is to dispense individual control to areas with different heat requirements and/or areas with different heating/cooling loads. For example, within a multi-tenant rental building with a single heating/cooling source, zone control allows respectively tenant to keep their part at their own desired temperature. Also, contained by a building with immense window areas on one side and mostly shade on another side, or significant crisscross exposure on one side, zone control allows all parts of that building to be kept at alike temperature.