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Datasheet generated 2026-10-07
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Danfoss PCV-VFQ 21 self-acting control valve assembly kit — PN 16, DN 250, Kvs 630 m³/h, Flange, dp 0.5–10 bar (003G1537)

Danfoss · HVAC & Refrigeration · Balancing Valves · Denmark · danfoss.com
Part Number
003G1537  ·  HS 8481.80
Danfoss PCV-VFQ 21 self-acting control valve assembly kit — PN 16, DN 250, Kvs 630 m³/h, Flange, dp 0.5–10 bar (003G1537)

Danfoss PCV-VFQ 21 pre-assembled self-acting control valve (OEM designation "Assem.kit PCV-VFQ21 PN16 250/630 flange"). Shipped as a factory assembly kit combining a Danfoss AF-series rolling-diaphragm actuator with a VFQ 21 grey cast-iron globe body, ready to install as one unit for flow (quantity) limitation. No external power or control signal is required — pipe pressure acting on the 630 cm² diaphragm limits the maximum volume flow to the set value. Valve size DN 250; PN 16; Kvs 630 m³/h; Flange connection; differential-pressure setting 0.5–10 bar; control ratio 750:1; media District heating/cooling circulation water (Glycolic water up to 30%), 2 °C to 150 °C. Body Grey cast iron EN-GJL-250 (GG-25); stem Normally closed; leakage rate 0.05 % Kvs. OEM P/N 003G1537. EAN 5702421813980. Technical data quoted verbatim from store.danfoss.com (code 003G1537).

Technical Specifications

Code number003G1537
TypePCV-VFQ 21
Product groupPilot - controlled valves
Gross weight408 Kilogram
Net weight408 Kilogram
Volume672 Liter
Actuator size [cm²]630 cm²
Cavitation factor0.2
Cavitation factor 100%0.16
Cavitation factor 25%0.31
Cavitation factor 50%0.26
Cavitation factor 75%0.2
China RoHS complianceOut of scope
Connection typesFlange
Contains batteriesNo
Control ratio750:1
DescriptionAssem.kit PCV-VFQ21 PN16 250/630 flange
Diameter [mm]250 mm
Differential pressure range [bar] [Min]0.5 bar
Differential pressure setting [bar] [Max]10 bar
Differential pressure setting [bar] [Min]0.5 bar
EU RoHS complianceOut of scope
Flow characteristicLinear optimized
FunctionPCV Assembly kit
Kvs values [m³/h]630 m³/h
Leakage rate [% Kvs]0.05
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
Permissible mediaDistrict heating/cooling circulation water
Pressure classPN 16
Pressure nominal [bar]16 bar
Sealing materialEPDM
Stem positionNormally closed
Valve body materialGrey cast iron EN-GJL-250 (GG-25)
Valve cone materialStainless steel, mat. No. 1.4021
Valve seat materialStainless steel, mat. No. 1.4313
Valve sizeDN 250
EAN5702421813980
HS code8481.80

Properties

MaterialValve body Grey cast iron EN-GJL-250 (GG-25); sealing EPDM
Pressure ratingPN 16
Temperature range2 °C to 150 °C
Standard sizePCV-VFQ 21
Thread standardFlange
MOQ1

Compatibility

The PCV-VFQ 21 kit is a complete self-acting control valve (AF actuator + VFQ 21 grey cast-iron globe body) and needs no separate body order. Valve DN 250, PN 16, Kvs 630 m³/h, Flange. An impulse tube set (003G13xx/14xx) connects the actuator diaphragm to the pressure tapping. Confirm DN, PN, Kvs and the differential-pressure setting range 0.5–10 bar against the AF-range / PCV data sheet before ordering.

Attached Documents