Danfoss AB-QM 4.0 Flexo (003Z1724) — a DN 20 HF pressure-independent balancing and control valve (PICV) for the terminal branches of heating and cooling systems. A built-in differential-pressure controller keeps the flow through the settable orifice constant regardless of pressure fluctuations elsewhere in the network; the presetting dial fixes the maximum flow and the valve also shuts off. Connection Internal thread. Supplied with integral strainer. Right-hand version. Supplied with test plugs for commissioning flow/pressure measurement. high flow range, nominal flow 1.9 m³/h. Pressure class PN 25, media temperature -10 °C to 95 °C (media). OEM designation "AB-QM 4.0 Flexo 80 R DN20HF w. strainer". OEM P/N 003Z1724. EAN 5715162960127. Contains lead per the REACH candidate list. Technical data quoted verbatim from store.danfoss.com (code 003Z1724).