Danfoss AVP (003H6377) — self-acting differential pressure controller, PN 25, DN 25, for district heating and central heating systems. The AVP closes on rising differential pressure, holding a stable differential pressure across the controlled circuit so that connected control valves keep their authority. It consists of a control valve and an actuator with one control diaphragm and a handle for differential-pressure setting. Unlike the AVPB, the AVP is a differential-pressure controller only (no integrated flow limiter). kVS 8 m³/h; differential-pressure setting range 0.3 – 2 bar, adjustable via handle. Maximum differential pressure 20 bar; medium temperature 2–150 °C; leakage 0.02% of kVS (IEC 534). Valve body ductile iron EN-GJS-400-18-LT (GGG 40.3), valve seat stainless steel 1.4571, valve cone dezincing free brass CuZn36Pb2As, control diaphragm EPDM. Connection flange PN 25. Media: circulation water / glycolic water up to 30% (pH 7–10). OEM P/N 003H6377, EAN 5702421538845. Technical data quoted verbatim from the Danfoss AVP PN 25 (VD.55.W6.02) data sheet and store.danfoss.com (code 003H6377). differential pressure 20 bar); Temperature range: 2 – 150 °C (medium); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.