FIELD: heating systems. SUBSTANCE: pressure regulator is installed in delivery pipeline. Boost pumps of return pipeline are connected to suction and pressure headers. Pressure regulator is arranged behind pressure header. Crossover pipe is connected to delivery pipeline after pressure regulator and to return pipeline between pressure header. Make-up pipeline of pressure regulator is cut into return pipeline before suction header and after pressure regulator. Outlet of looping pipeline and inlet of bypass pipeline are connected to return pipeline after pressure regulator; respectively inlet and outlet of these pipelines are connected to return pipeline before suction header. Control valve is coupled with pressure transmitters arranged on headers of pumps. EFFECT: enlarged operating capabilities. 1 dwg
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