Country, region and language selection

International websites


Americas / Oceania

Africa and Middle East

Asia / Pacific

ISORIA 20/25 Butterfly valve

Butterfly valveISORIA 20/25

Centred-disc butterfly valve, sealed by elastomer liner, with lever or manual gearbox, pneumatic, electric or hydraulic actuator. Semi-lug body (T2), full-lug body (T4) or U-section body with flat faces (T5). Body types T2, T4 and T5 are suitable for downstream dismantling and dead-end service with counterflange. Connections to EN, ASME, JIS.
See all documents and downloads

Main Applications

  • Cooling circuits
  • Seawater desalination/reverse osmosis
  • Flue gas desulphurisation
  • Paper industry / pulp industry

Technical Data

  • Nominal pressurePN 20, PN 25
  • Max. nominal sizeDN 1000
  • Max. allowed fluid temperature200 °C

Your KSB contact: We’re here to support you

Do you need any assistance finding the right material number?
We’ll soon provide a list so you can directly place your purchase order.
Meanwhile please contact our support:

Tel: +86 4000218000

Your KSB contact : We’re here to support you


  • Spherically machined disc with rounded sealing contour
    • ensures durable and permanently tight shut-off
  • Splined or keyed connection without play between shaft and valve disc

    Technical Data

    • FunctionShut off/control flow
    • Connection typeInstallation between flanges,
    • Design concept DriveWith electric actuator,
      With handwheel,
      With pneumatic actuator,
    • Casing materialEN-GJS-400-15/A536 GRADE 60-40-18
    • Nominal pressurePN 20,
      PN 25
    • Max. nominal sizeDN 1000
    • Min. nominal sizeDN 32
    • Max. allowed fluid temperature200 °C
    • Min. allowed fluid temperature-10 °C
    • Valve body typeSemi-lug type,
      Full-lug type, flat faces,
      Full-lug type, raised faces,
      U-shaped body, flat faces

    Sectional Drawings


    Last change
    2-page product description ISORIA (8446.022_EN)PDF1.298/23/2022