Danfoss AVPQT pressure-independent control valve (Δp + flow + temperature), PN 25, DN 50, flow 0.8 – 15 m³/h, Δp 0.2 – 1 bar, flange, return mounting

Danfoss AVPQT (003H6812) — self-acting multi-functional controller combining differential-pressure control, flow limitation and return-temperature limitation, PN 25, DN 50, return-pipe mounting, for district heating and domestic-hot-water substations. The AVPQT combines three self-acting functions in one valve: differential-pressure control, flow (volume) limitation and, via a thermostatic element, temperature limitation of the return. It maintains a constant differential pressure across the integrated flow-limiting valve while the thermostatic actuator throttles on rising return temperature — no auxiliary energy required. kVS 25 m³/h; flow-rate range 0.8 – 15 m³/h at Δpb 0.2 bar; differential-pressure setting 0.2 – 1 bar; maximum differential pressure 12 bar; medium temperature 2–150 °C; leakage 0.05% of kVS (IEC 534). Valve body ductile iron EN-GJS-400-18-LT (GGG 40.3), valve seat stainless steel 1.4571, valve cone dezincing free brass CuZn36Pb2As, control diaphragm EPDM. Connection flange PN 25. OEM P/N 003H6812, EAN 5702421543337. Technical data quoted verbatim from store.danfoss.com (code 003H6812). differential pressure 12 bar); Temperature range: 2 – 150 °C (medium); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.

Code number

003H6812

Type

AVPQT

Product group

Pressure and flow controllers (multi-functional)

Description

Self-acting combined differential-pressure, flow-limiting and temperature controller, return mounting

Valve size

DN 50

Pressure class

PN 25

kVS value

25 m³/h

Flow-rate range

0.8 – 15 m³/h

Flow restrictor differential pressure (Δpb)

0.2 bar

Connection

flange PN 25

Differential pressure setting

0.2 – 1 bar (adjustable)

Max. differential pressure

12 bar

Application

District Heating

Medium

Circulation water / glycolic water up to 30% (pH 7–10)

Medium temperature

2 – 150 °C

Leakage (IEC 534)

0.05% of kVS

Mounting version

Return

Stem position

Normally open

Valve body

Ductile iron EN-GJS-400-18-LT (GGG 40.3)

Valve seat

Stainless steel, mat. No. 1.4571

Valve cone

Dezincing free brass CuZn36Pb2As

Control diaphragm

EPDM

EU RoHS compliance

Out of scope

REACH Candidate List substance

Lead (CAS no. 7439-92-1)

Net weight

16.127 Kilogram

Gross weight

16.127 Kilogram

Packed volume

28.039 Liter

EAN

5702421543337

HS code

8481.80

Material

Valve body ductile iron EN-GJS-400-18-LT (GGG 40.3); valve seat stainless steel 1.4571; valve cone dezincing free brass CuZn36Pb2As; control diaphragm EPDM

Pressure Rating

PN 25 (max. differential pressure 12 bar)

Temperature Range

2 – 150 °C (medium)

HS Code

8481.80