Danfoss AVTB (fast) self-acting temperature controller, OEM P/N 003N8252. Proportional self-acting controller that regulates water temperature in district heating and cooling circuits; a remote 2 m capillary and charged sensor (Ø 9.5 mm × 180 mm) sense the medium temperature and throttle the valve, with a 3-second reaction time (fast version). DN 25, PN 16, internal thread NPT 1 in. Kvs 5.5 m³/h; temperature setting range 20 – 60 °C, linear characteristic. Brass body (CuZn40Pb2), NBR valve cone, Cr Ni steel valve seat, copper impulse tube and sensor. Max differential pressure 10 bar; media temperature 2 – 130 °C, max sensor temperature 90 °C. Approved to ETA VA 1.54/18952. Confirm the setting range and code against the datasheet before ordering.
| Brand | Danfoss |
| Part number | 003N8252 |
| Model | AVTB (fast) self-acting temperature controller |
| Category | HVAC & Refrigeration — Water Regulating Valves |
| Version | self-acting proportional controller, remote capillary sensor, fast response, internal thread |
| Function | temperature controller; charged sensor throttles the valve to hold the set medium temperature |
| Nominal size | DN 25 |
| Pressure class | PN 16 |
| Connection | internal thread NPT 1 in |
| Kvs | 5.5 m³/h |
| Temperature setting range | 20 – 60 °C |
| Flow characteristic | linear |
| Max differential pressure | 10 bar |
| Media temperature range | 2 °C to 130 °C |
| Max sensor temperature | 90 °C |
| Ambient temperature range | 0 °C to 70 °C |
| Capillary tube length | 2 m |
| Sensor | Ø 9.5 mm × 180 mm |
| Reaction time (open/close) | 3 s; time constant 3 s |
| Cavitation factor | 0.4 |
| Mounting version | return |
| Body material | brass CuZn40Pb2 |
| Valve cone material | NBR rubber |
| Valve seat material | Cr Ni steel |
| Impulse tube material | copper |
| Application | district heating / cooling circulation water; glycolic water up to 30% |
| Packing | Single pack |
| EAN | 5702421101469 |
| Approvals | ETA VA 1.54/18952, EAC, PED, EU RoHS, China RoHS |
| Material | Body brass CuZn40Pb2; valve cone NBR rubber; valve seat Cr Ni steel; impulse tube copper |
| Pressure rating | PN 16; max differential pressure 10 bar |
| Temperature range | 2 °C to 130 °C (media); max sensor 90 °C |
| Standard size | DN 25 |
| Thread standard | ANSI/ASME B1.20.1 (NPT) |
| MOQ | 1 |
Mount the valve body in the water line (return version) and locate the sensor where it reads the controlled medium; the 2 m capillary connects the two. Self-acting (no external power). Set the temperature on the adjustment spindle. Confirm code and setting range before ordering.