FIELD: heat exchange.
SUBSTANCE: valve device for the heat exchanger comprises pressure control valve (17) which comprises valve element (18) cooperating with throttling element (19) and controlling differential pressure (P2-P3). Device includes detecting means (28, 29) detecting the excess of the specified minimum pressure by indicated pressure drop (P2-P3). With pressure control valve (17), flow control valve (23) is connected in series, said pressure control valve (17) being adapted to control pressure drop (P2-P3) on said flow control valve (23).
EFFECT: means by which energy for pumping in the heating system can be maintained at a low level are provided.
12 cl, 3 dwg
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