Danfoss AVQMT (003H6782) — self-acting flow and temperature controller with integrated pressure-independent control valve, PN 25, DN 50, for district heating and cooling systems. The AVQMT holds the flow constant and limits it to the set maximum and closes on rising temperature; the integrated control valve accepts a Danfoss AMV(E) electric actuator (for ECL electronic control) or an AVT/STM thermostatic actuator for combined flow and temperature control. It comprises a control valve with adjustable flow restrictor, a connection neck for the thermostatic actuator, a connection neck for the electric actuator, and a pressure actuator with one control diaphragm. Flow range 0.8 - 14 m³/h; flow-restrictor differential pressure 0.2 bar; Kvs 25 m³/h. Maximum differential-pressure range 16 bar; media temperature 2–150 °C; cavitation factor z ≥ 0.6; seat leakage 0.05 % Kvs (IEC 60534). Temperature is set by the separately ordered AVT thermostatic actuator, setting ranges 10–40 / 20–70 / 40–90 / 60–110 °C and 10–45 / 35–70 / 60–100 / 85–125 °C (AVT actuator, ordered separately); the controller is delivered assembled with the impulse tube between valve and actuator, the actuator ordered separately. Combined with AMV(E), AVT or STM actuators the controller is type-tested to EN 14597. Valve body Ductile iron EN-GJS-400-18-LT (GGG 40.3); valve cone Dezincing free brass CuZn36Pb2As; seat Stainless steel, mat. 1.4571; control diaphragm EPDM. Connection Flange DN 50 (EN 1092-2). Mounting version Free. Permissible media: District heating/cooling circulation water (Glycolic water up to 30%), pH 7–10. OEM P/N 003H6782. Technical data quoted verbatim from store.danfoss.com (code 003H6782) and the Danfoss AVQT / AVQMT (PN 25) data sheet. 1.4571; control diaphragm EPDM; Pressure rating: PN 25 (max. differential-pressure range 16 bar); Temperature range: 2 to 150 °C (district heating/cooling water); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.