{
  "name": "Inzonex ISO 12241 valve area lookup",
  "version": "2026-08-29.1",
  "source": "ISO 12241:2022 Annex A.2.3, Table A.3",
  "source_url": "https://www.iso.org/standard/74655.html",
  "scope": {
    "valve_type": "Manual flanged industrial blocking valve",
    "dn": "DN15-DN200",
    "pressure_class": "PN16-PN25"
  },
  "formula": "A_A = 23.2 * D_p,e^2 + 1.37 * D_p,e + 0.0718",
  "units": {"D_p,e": "m", "A_A": "m2"},
  "non_extrapolation": true,
  "limitation": "Nominal size does not define an exact product contour. Use project drawings for final design and do not extrapolate beyond DN200.",
  "rows": [
    {"dn":"DN15","pipe_od_mm":21.3,"bare_valve_area_m2":0.1115},
    {"dn":"DN20","pipe_od_mm":26.7,"bare_valve_area_m2":0.1249},
    {"dn":"DN25","pipe_od_mm":33.4,"bare_valve_area_m2":0.1434},
    {"dn":"DN32","pipe_od_mm":42.2,"bare_valve_area_m2":0.1709},
    {"dn":"DN40","pipe_od_mm":48.3,"bare_valve_area_m2":0.1921},
    {"dn":"DN50","pipe_od_mm":60.3,"bare_valve_area_m2":0.2388},
    {"dn":"DN65","pipe_od_mm":73.0,"bare_valve_area_m2":0.2954},
    {"dn":"DN80","pipe_od_mm":88.9,"bare_valve_area_m2":0.3769},
    {"dn":"DN100","pipe_od_mm":114.3,"bare_valve_area_m2":0.5315},
    {"dn":"DN125","pipe_od_mm":139.7,"bare_valve_area_m2":0.7160},
    {"dn":"DN150","pipe_od_mm":168.3,"bare_valve_area_m2":0.9595},
    {"dn":"DN200","pipe_od_mm":219.1,"bare_valve_area_m2":1.4857}
  ],
  "distribution": {
    "csv": "https://inzonex.co.uk/calc/valve-geometry-assets/valve-area-iso12241.csv",
    "json": "https://inzonex.co.uk/calc/valve-geometry-assets/valve-area-iso12241.json"
  }
}