Danfoss PCV-VFG 21 pre-assembled self-acting control valve (OEM designation "Assem.kit PCV-VFG21 PN16 250/630 flange"). Shipped as a factory assembly kit combining a Danfoss AF-series rolling-diaphragm actuator with a VFG 21 grey cast-iron globe body, ready to install as one unit for differential-pressure / pressure control. No external power or control signal is required — pipe pressure acting on the 630 cm² diaphragm holds the set differential pressure across the load. Valve size DN 250; PN 16; Kvs 630 m³/h; Flange connection; differential-pressure setting 0.5–15 bar; control ratio 750:1; media District heating/cooling circulation water (Glycolic water up to 30%), 2 °C to 150 °C. Body Grey cast iron EN-GJL-250 (GG-25); stem Normally closed; leakage rate 0.05 % Kvs. OEM P/N 003G1507. Technical data quoted verbatim from store.danfoss.com (code 003G1507). Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.