The Danfoss AVQM flow controller is an automatic hydraulic device designed to maintain a constant volumetric flow rate in heating, cooling and air-conditioning systems, regardless of fluctuations in differential pressure in the network. The unit combines the function of a control valve and a flow controller in one compact body, simplifying both system design and installation.

The valve body is made of brass and fitted with a precision flow controller with a spring mechanism that automatically compensates for pressure fluctuations within the operating pressure range. The G 1" threaded connection (DN 20) and nominal pressure PN 25 make this controller suitable for use in underfloor heating branches, fan coil circuits, or distribution nodes in district heating and cooling systems.