Danfoss AVTB (fast) DN 25 Self-Acting Temperature Controller 20 °C – 60 °C

Danfoss AVTB (fast) self-acting temperature controller, OEM P/N 003N8253, DN 25, PN 16. Proportional self-acting valve that throttles flow to hold a temperature set point without external power; the charged sensor and 2 m capillary act directly on the valve cone. The "fast" version reacts within about 3 seconds for tight control. Setting range 20 °C – 60 °C; Kvs 5.5 m³/h; connection Rp 1 (internal thread, ISO 7/1); brass body CuZn40Pb2; linear flow characteristic; return mounting. Media: district heating/cooling circulation water (pH 7–10). Approved to ETA VA 1.54/18952.

Brand

Danfoss

Part number

003N8253

Type designation

AVTB (fast) PN 16, DN 25, 5.5 m³/h, 20 °C – 60 °C, 2 m, internal thread

Category

HVAC & Refrigeration — Water Regulating Valves

Function

self-acting proportional temperature controller (throttles on rising temperature)

Nominal size

DN 25

Pressure class

PN 16

Kvs

5.5 m³/h

Temperature setting range

20 °C – 60 °C

Connection

Rp 1 (internal thread, ISO 7/1)

Capillary tube length

2 m

Temperature sensor

Copper, mat. no. 2.0090

Flow characteristic

Linear

Mounting version

Return

Body material

Brass CuZn40Pb2 (W.-no. 2.0402)

Valve cone / seat

NBR / brass

Media

District heating / cooling circulation water (pH 7–10)

Ambient temperature range

0 °C to 70 °C

EAN

5702421100912

Approvals

ETA VA 1.54/18952; EAC, PED, EU RoHS, China RoHS

Size / Series

DN 25

Material

Body brass CuZn40Pb2 (W.-no. 2.0402); cone/seat NBR / brass; sensor Copper, mat. no. 2.0090

Thread Standard

ISO 7/1

Pressure Rating

PN 16

Temperature Range

20 °C – 60 °C setting range

Classification / Approval

ETA VA 1.54/18952, EAC, PED, EU + China RoHS

HS Code

8481.80