For maintenance of the set differential pressure, pressure "after itself" by changing (controlling) the flow rate, for maintenance of the set flow rate of non-flammable, explosion-proof, non-toxic liquid media, including water, aqueous solutions of ethylene glycol and propylene glycol with concentration up to 50 %, flowing through pipelines.
Typical application: maintenance of set pressure difference between supply and return pipelines of heat carrier in heat supply systems.
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