Danfoss APF automatic balancing valve, DN 80, OEM order code 003Z5754. The APF is a self-acting differential-pressure control valve for hydronic distribution: it holds the differential pressure across a branch or terminal within its 20 KPa-40 KPa kPa adjustable range (factory setting 30 KPa), using an integral impulse tube (2.5 m) to sense the pressure across the served circuit. This keeps thermostatic/terminal control valves authoritative and the circuit balanced across the full load range without manual re-commissioning. flange connection, grey cast iron (en-gjl-250) body, PN 16, Kvs 63 m³/h m³/h, media -20 °C … 120 °C °C, max. differential pressure over the valve 250 KPa. Mounting: return pipe. Genuine Danfoss part; data quoted verbatim from store.danfoss.com (code 003Z5754). OEM P/N 003Z5754, EAN 5710104094731. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.