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

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

Size / Series

DN 25

Material

Body brass CuZn40Pb2; valve cone NBR rubber; valve seat Cr Ni steel; impulse tube copper

Thread Standard

ANSI/ASME B1.20.1 (NPT)

Pressure Rating

PN 16; max differential pressure 10 bar

Temperature Range

2 °C to 130 °C (media); max sensor 90 °C

Classification / Approval

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

HS Code

8481.80