Danfoss AHQM (balancing valves), OEM order code 003L3601. Self-acting combined automatic flow limiter and differential-pressure controller (pressure-independent control valve) for hydronic balancing of heating and cooling circuits. Manufacturer description: AHQM PN16 40/12,5/0,2 ext.thr flow/ret. connection/size DN 40, Kvs 12.5 m³/h, PN 16; max. differential pressure 4 bar, media/setting temperature 2 °C to 120 °C, body material Grey cast iron EN-GJL-250 (GG-25). EAN 5710104028736. HS 8481.80. Specifications quoted verbatim from store.danfoss.com (code 003L3601).
| Brand | Danfoss |
| Part number | 003L3601 |
| Code number | 003L3601 |
| Type | AHQM |
| Product group | Pressure flow controllers |
| Description | AHQM PN16 40/12,5/0,2 ext.thr flow/ret |
| Gross weight | 6.33 Kilogram |
| Net weight | 6.33 Kilogram |
| Actuator diaphragm material | EPDM |
| Application | District Heating |
| Cavitation factor | 0.6 |
| Connection size | G 2 A |
| Connection types | External Thread |
| Diameter [mm] | 40 mm |
| Differential pressure range [bar] [Max] | 4 bar |
| Flow control | Yes |
| Flow limitation | Yes |
| Flow rate [m³/h] | 7.5 m³/h |
| Flow rate [m³/h] [Max] | 7.5 m³/h |
| Flow rate [m³/h] [Min] | 1.5 m³/h |
| Flow restrictor diff.pressure - dpb [bar] | 0.2 bar |
| Function | Flow controller with int. control valve |
| Function VSP - P | No |
| Function VSP - Q | No |
| Function VSP - T | No |
| Kvs values [m³/h] | 12.5 m³/h |
| Leakage rate [% Kvs] | 0.05 |
| Media pH [Max] | 10 |
| Media pH [Min] | 7 |
| Media temperature [°C] [Max] | 120 °C |
| Media temperature [°C] [Min] | 2 °C |
| Medium alternative | Glycolic water up to 30% |
| Mounting version | Free |
| Number of ports | 2 |
| Permissible media | District heating/cooling circulation water |
| PN alternative VSP | 10 |
| Pressure class | PN 16 |
| Pressure controller | No |
| Pressure nominal [bar] | 16 bar |
| Sealing CV material | Metal |
| Sealing DP material | EPDM |
| Setting Type | None |
| Stem position | Normally open |
| Stroke [mm] | 10 mm |
| Valve body material | Grey cast iron EN-GJL-250 (GG-25) |
| Valve cone CV material | DZR CW602N (CuZn36Pb2As) |
| Valve cone DP material | Stainless steel, mat. No. 1.4404 |
| Valve seat material | Stainless steel, mat. No. 1.4404 |
| Valve size | DN 40 |
| EAN | 5710104028736 |
| HS code | 8481.80 (taps, cocks, valves for pipes) |
| Material | Grey cast iron EN-GJL-250 (GG-25) |
| Pressure rating | PN 16; max. differential pressure 4 bar |
| Temperature range | 2 °C to 120 °C |
| Standard size | DN 40 |
| MOQ | 1 |
Genuine Danfoss part, order code 003L3601 (Pressure flow controllers). Confirm the code, size (DN 40) and matching valve/actuator family against your Danfoss datasheet before ordering.