Danfoss ASV-PV 3G DN 50 — third-generation self-acting differential-pressure controller for automatic hydronic balancing. Installed in the return pipe of a heating or cooling circuit, it holds a constant differential pressure across the branch or terminal (paired with an ASV-BD/ASV-M/ASV-I partner valve and an impulse tube), so that two-way control-valve authority stays high and flow noise is avoided at part load. Differential-pressure setting range 60-100 kPa (factory setting ), Kvs 20 m³/h, body, Flange connection,, media temperature to, integral shut-off. OEM P/N 003Z0646. EAN 5710104523996. Technical data quoted verbatim from store.danfoss.com (code 003Z0646).