... refrigeration, heating system, 2-way/3-way(mixing, diverting), DN20 -- D Used in air-conditioning, refrigeration, heating system, 2-way/3-way(mixing, diverting), DN20 ... -- DN400Brass, Cast iron/steel , Stainless steel, valve body available. Screw/Flange connection ... thermostatAdjustment>50Leakage: Less than 0.02%Kv Modulating Valve