FIELD: machine building.
SUBSTANCE: invention relates to a valve system, in particular to a heat exchanger valve system having a pressure control valve, while the said pressure control valve comprises a valve element adapted to interact with the throttling element and control the pressure differential.
EFFECT: in addition, the invention relates to a method for checking the operability of a valve, where the sensor determines the position of the valve element and where a certain position is compared with the expected position to determine that the valve device is working in accordance with expectations.
13 cl, 9 dwg
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