Danfoss AVDA Constant Flow Regulator Bypass Valve

Danfoss is an internationally recognised Danish engineering and manufacturing company founded in 1933 by Mads Clausen in Nordborg, Denmark. Initially established as Dansk Køleautomatik- og Apparatfabrik, the company grew rapidly to become a global leader in heating, cooling, drive, and industrial automation solutions.

The Danfoss Type AVDA shown is a self-acting constant-flow regulator and bypass valve designed primarily for district heating substations and domestic central heating systems to maintain circulation and control differential pressure.

Danfoss remains privately held, with its ultimate ownership retained by the Clausen family primarily through the Bitten & Mads Clausen Foundation. Although Danfoss operates production facilities globally across Europe, North America, and Asia, its core valve engineering and extensive hydronic control lines have historically been and continue to be produced across Denmark and neighbouring European manufacturing sites.