Danfoss LENO MSV-O — manual (static) balancing valve with fixed venturi orifice, OEM order code 003Z4023. Manual static balancing valve with a fixed venturi measuring orifice and presetting for constant-flow hydronic balancing. The venturi gives a defined differential-pressure signal at the two test plugs so flow can be measured directly; presetting fixes the design flow in the branch or riser. Drain function and shut-off are built in. Tapered ISO 7/1 external thread. (MSV-O DN 25, Internal thread, fixed venturi orifice, manual balancing valve.) Nominal size DN 25, Kvs 9.7 m³/h, PN 20, Internal thread ISO 7/1 connection (Rp 1), DZR brass body, media temperature -20 °C to 120 °C. Net weight 1.112 Kilogram. Genuine Danfoss part; technical data quoted verbatim from store.danfoss.com (code 003Z4023). OEM P/N 003Z4023, EAN 5702420096681. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.