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Duostats are thermostats, type V, which via two sensing elements in a common hydraulic
system act on one and the same control valve.
Two basic types are available: V4.05 or V4.10, depending on the preferable proportional
band PB, and the valve size.
1. Adjustment of discharge air temperatures in hot-air heating plants, dependent on the
outdoor temperature.
2. Adjustment of two temperatures which are interdependent e.g. the hot-water tank of
a district heating plant with simultaneous control that the return water temperature
does not become too high.
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