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Datasheet generated 2026-10-07
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Danfoss AFQM 2 DN 125 PN 25 pressure-independent flow control valve — flange, Kvs 250 m³/h, flow 20–100 m³/h (003G5520)

Danfoss · HVAC & Refrigeration · Balancing Valves · Denmark · danfoss.com
Part Number
003G5520  ·  HS 8481.80
Danfoss AFQM 2 DN 125 PN 25 pressure-independent flow control valve — flange, Kvs 250 m³/h, flow 20–100 m³/h (003G5520)

Danfoss AFQM 2 DN 125 PN 25 — self-acting pressure-independent flow control valve (flow limiter with integrated control valve) for district heating and district cooling circuits. Combines automatic flow limitation with a control valve in one body; the flow set point is held independent of differential-pressure variation across the valve. Flange connection. Kvs 250 m³/h; adjustable flow range 20–100 m³/h (flow restrictor differential pressure dpb 0.2 bar). Media temperature 2 °C to 150 °C. Maximum operating pressure 25 bar. Body Ductile cast iron EN-GJS-400-18-LT (GGG 40.3); valve cone and seat Stainless steel mat. No. 1.4021; EPDM seals and rolling diaphragm. Normally-open stem, stroke 23 mm. Medium: district heating/cooling circulation water (glycolic water up to 30%). OEM designation "AFQM 2, PN 25, DN 125, Flow rate [m³/h]: 20 - 100, Flange, Mounting version: Free". OEM P/N 003G5520. EAN 5710104522630. Technical data quoted verbatim from store.danfoss.com (code 003G5520).

Technical Specifications

Code number003G5520
TypeAFQM 2
Product groupPressure flow controllers
Gross weight93 Kilogram
Net weight91 Kilogram
Volume281.88 Liter
Actuator diaphragm materialEPDM (Rolling, fibre enforced)
Actuator size [cm²]160 cm²
ApplicationDistrict heating and cooling
Cavitation factor0.4
Cavitation factor 100%0.37
Cavitation factor 25%0.47
Cavitation factor 50%0.47
Cavitation factor 75%0.41
China RoHS complianceOut of scope
Connection sizeDN 125
Connection typesFlange
Contains batteriesNo
DescriptionPressure independent control valve
Diameter [mm]125 mm
Differential pressure range [bar] [Max]15 bar
EU RoHS complianceOut of scope
Flow controlYes
Flow limitationYes
Flow rate [m³/h]100 m³/h
Flow rate [m³/h] [Max]100 m³/h
Flow rate [m³/h] [Min]20 m³/h
Flow restrictor diff.pressure - dpb [bar]0.2 bar
FunctionFlow controller with int. control valve
Function VSP - PNo
Function VSP - QNo
Function VSP - TNo
Kvs values [m³/h]250 m³/h
Leakage rate [% Kvs]0.01
Leakage through port max. [% Kvs]0.01
Media pH [Max]10
Media pH [Min]7
Media temperature [°C] [Max]150 °C
Media temperature [°C] [Min]2 °C
Medium alternativeGlycolic water up to 30%
Mounting versionFree
Number of ports2
Operating pressure [bar] [Max]25 bar
Permissible mediaDistrict heating/cooling circulation water
PN alternative VSP40
Pressure classPN 25
Pressure controllerNo
Pressure nominal [bar]25 bar
Pressure relieve system control valve insertChamber
REACH Candidate List substancesLead (CAS no. 7439-92-1)
SCIP dossier no.b7b59542-4217-4c5c-96a5-552807d72d74
SCIP dossier product nameAFQM DN65-400
Sealing CV materialEPDM
Sealing DP materialEPDM
Setting TypeFixed
Stem positionNormally open
Stroke [mm]23 mm
Valve body materialDuctile cast iron EN-GJS-400-18-LT (GGG 40.3)
Valve cone CV materialStainless steel mat. No. 1.4021
Valve cone DP materialStainless steel mat. No. 1.4021
Valve seat DP materialStainless steel, mat. No. 1.4021
Valve seat materialStainless steel, mat. No. 1.4021
Valve sizeDN 125
EAN5710104522630
HS code8481.80

Properties

MaterialValve body Ductile cast iron EN-GJS-400-18-LT (GGG 40.3); cone/seat Stainless steel mat. No. 1.4021; EPDM diaphragm and seals
Pressure ratingPN 25
Temperature range2 °C to 150 °C
Standard sizeAFQM 2
MOQ1

Compatibility

AFQM 2 is a self-acting flow limiter with an integrated control valve; select by pipe size (DN 125), pressure class (PN 25) and required flow range. The AFQM range spans DN 65–250 in PN 16 / PN 25 / PN 40, each size offered in two overlapping flow bands (flow-restrictor dpb 0.2 bar or 0.5 bar). For combined flow + differential-pressure limitation use AFQMP; for an external electric set-point use the AFQM 6 / motorised variants. Confirm DN, PN and flow band against the AFQM data sheet before ordering.

Attached Documents