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SKU AK-BOAX-S Category

Butterfly valve BOAX-S Wafer

Soft-sealing wafer butterfly valve for HVAC, water and energy systems.

Data sheet

60 versions
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Armaturenfabrik Valve Butterfly valve BOAX-S from KSB with thermometers, wafer intermediate flange, soft-sealing, ductile iron
Armaturenfabrik Valve Butterfly valve BOAX-S from KSB with thermometers, wafer intermediate flange, soft-sealing, ductile iron
Armaturenfabrik Valve Butterfly valve BOAX-S from KSB with handlever
Armaturenfabrik Valve Butterfly valve BOAX-S from KSB automated with electric quarter-turn actuator
Armaturenfabrik Valve Butterfly valve BOAX-S from KSB

Product information

The KSB butterfly valve BOAX-S is a centric, soft-seated industrial valve in wafer design for water, energy and HVAC systems. With its compact, maintenance-free construction, the reliable elastomer liner and the high-grade stainless steel disc, the BOAX-S offers a durable, universally applicable solution for drinking water, heating and cooling circuits as well as building services systems. Thanks to the ISO 5211 interface it is ideal for integrated automation.

Special features

  • Centric, soft-seated design
  • Wafer design (between flanges) for easy installation
  • Elastomer liner (EPDM or NBR) with high tightness, leakage rate A
  • Disc in stainless steel
  • Face-to-face length to ISO 5752 / EN 558, series 20
  • Flange connection to EN 1092
  • Corrosion-resistant external coating (epoxy resin or polyurethane)
  • ISO 5211 mounting for automation
  • Optionally with thermometer connection

Advantages

  • Wafer design for clamping between flanges
  • Liner in EPDM-XU, nitrile-K or EG
  • From DN 20 to DN 250 with a lock against unintentional operation
  • Silicone-free, insulation quick and easy to fit

Versions

  • Nominal sizes: DN 20-DN 600
  • Pressure ratings: PN 6 / PN 10 / PN 16
  • Seals:
    EPDM (standard for water, drinking water)
    NBR (for oils, air, individual industrial media)
  • Version:
    Wafer design (between flanges)
    One-piece body with centring lugs
  • Automation options:
    Hand lever
    Worm gearbox
    Pneumatic part-turn actuators
    Electric actuators (24 V / 230 V)
    Limit switch boxes, position indicators, solenoid valves

Areas of application

  • Drinking water applications
  • Installation between two flanges
  • Plants where the valve is insulated
  • Automation via the ISO 5211 interface

Recommendation

In combination with AirTorque actuators and accessories – matched to the BOAX-S wafer butterfly valve.

Selection and installation

The BOAX-S is clamped between two flanges and needs no flanges of its own – the lighter and less expensive version. Where one side has to be dismantled, the BOAX-SF with threaded lugs is required.

FeatureSpecification
TypeBOAX-S (wafer type)
Nominal size (DN)DN 20 – DN 600
Nominal pressure (PN)PN 6 / PN 10 / PN 16
Housing materialEN-GJS-400-15 (ductile iron)
Disc materialStainless steel 1.4301 / 1.4308
Seat/gasketEPDM-XU, Nitrile-K, Epichlorohydrin EG
Temperature range-10 °C to +130 °C (depending on gasket)
StandardsEN 593, EN 12266-1, ISO 5752-20, EN 558-1-20
Face-to-face lengthISO 5752 Series 20
Flanged connectionEN 1092-1
Drive flangeISO 5211
Leakage rateA according to EN 12266-1
CoatingEpoxy resin or polyurethane, orange RAL 2002
Special featuresMaintenance-free, automation possible

Available versions

60 of 60 versions

Article number Nominal size Seat material Operation Face-to-face Price excl. VAT
AK-BOAX-S-020ESH DN20 3/4" EPDM Hand lever 27 mm 84.89 EUR
AK-BOAX-S-020EGB DN20 3/4" EPDM Gearbox 27 mm 232.24 EUR
AK-BOAX-S-020NSH DN20 3/4" Nitrile Hand lever 27 mm 84.89 EUR
AK-BOAX-S-020NGB DN20 3/4" Nitrile Gearbox 27 mm 232.24 EUR
AK-BOAX-S-025ESH DN25 1" EPDM Hand lever 27 mm 84.89 EUR
AK-BOAX-S-025EGB DN25 1" EPDM Gearbox 27 mm 232.24 EUR
AK-BOAX-S-025NSH DN25 1" Nitrile Hand lever 27 mm 84.89 EUR
AK-BOAX-S-025NGB DN25 1" Nitrile Gearbox 27 mm 232.24 EUR
AK-BOAX-S-032ESH DN32 1 1/4" EPDM Hand lever 27 mm 88.64 EUR
AK-BOAX-S-032EGB DN32 1 1/4" EPDM Gearbox 27 mm 235.97 EUR
AK-BOAX-S-032NSH DN32 1 1/4" Nitrile Hand lever 27 mm 88.64 EUR
AK-BOAX-S-032NGB DN32 1 1/4" Nitrile Gearbox 27 mm 235.97 EUR
AK-BOAX-S-040ESH DN40 1 1/2" EPDM Hand lever 33 mm 109.87 EUR
AK-BOAX-S-040EGB DN40 1 1/2" EPDM Gearbox 33 mm 257.20 EUR
AK-BOAX-S-040NSH DN40 1 1/2" Nitrile Hand lever 33 mm 109.87 EUR
AK-BOAX-S-040NGB DN40 1 1/2" Nitrile Gearbox 33 mm 257.20 EUR
AK-BOAX-S-050ESH DN50 2" EPDM Hand lever 43 mm 119.84 EUR
AK-BOAX-S-050EGB DN50 2" EPDM Gearbox 43 mm 267.18 EUR
AK-BOAX-S-050NSH DN50 2" Nitrile Hand lever 43 mm 119.84 EUR
AK-BOAX-S-050NGB DN50 2" Nitrile Gearbox 43 mm 267.18 EUR
AK-BOAX-S-065ESH DN65 2 1/2" EPDM Hand lever 46 mm 131.08 EUR
AK-BOAX-S-065EGB DN65 2 1/2" EPDM Gearbox 46 mm 278.41 EUR
AK-BOAX-S-065NSH DN65 2 1/2" Nitrile Hand lever 46 mm 131.08 EUR
AK-BOAX-S-065NGB DN65 2 1/2" Nitrile Gearbox 46 mm 278.41 EUR
AK-BOAX-S-080ESH DN80 3" EPDM Hand lever 46 mm 161.05 EUR
AK-BOAX-S-080EGB DN80 3" EPDM Gearbox 46 mm 308.39 EUR
AK-BOAX-S-080NSH DN80 3" Nitrile Hand lever 46 mm 161.05 EUR
AK-BOAX-S-080NGB DN80 3" Nitrile Gearbox 46 mm 308.39 EUR
AK-BOAX-S-100ESH DN100 4" EPDM Hand lever 52 mm 184.08 EUR
AK-BOAX-S-100EGB DN100 4" EPDM Gearbox 52 mm 327.85 EUR
AK-BOAX-S-100NSH DN100 4" Nitrile Hand lever 52 mm 184.08 EUR
AK-BOAX-S-100NGB DN100 4" Nitrile Gearbox 52 mm 327.85 EUR
AK-BOAX-S-125ESH DN125 5" EPDM Hand lever 56 mm 227.21 EUR
AK-BOAX-S-125EGB DN125 5" EPDM Gearbox 56 mm 371.56 EUR
AK-BOAX-S-125NSH DN125 5" Nitrile Hand lever 56 mm 227.21 EUR
AK-BOAX-S-125NGB DN125 5" Nitrile Gearbox 56 mm 371.56 EUR
AK-BOAX-S-150ESH DN150 6" EPDM Hand lever 56 mm 332.07 EUR
AK-BOAX-S-150EGB DN150 6" EPDM Gearbox 56 mm 340.85 EUR
AK-BOAX-S-150NSH DN150 6" Nitrile Hand lever 56 mm 332.07 EUR
AK-BOAX-S-150NGB DN150 6" Nitrile Gearbox 56 mm 340.85 EUR
AK-BOAX-S-200ESH DN200 8" EPDM Hand lever 60 mm 546.27 EUR
AK-BOAX-S-200EGB DN200 8" EPDM Gearbox 60 mm 749.78 EUR
AK-BOAX-S-200NSH DN200 8" Nitrile Hand lever 60 mm 546.27 EUR
AK-BOAX-S-200NGB DN200 8" Nitrile Gearbox 60 mm 749.78 EUR
AK-BOAX-S-250ESH DN250 10" EPDM Hand lever 68 mm 795.25 EUR
AK-BOAX-S-250EGB DN250 10" EPDM Gearbox 68 mm 975.70 EUR
AK-BOAX-S-250NSH DN250 10" Nitrile Hand lever 68 mm 795.25 EUR
AK-BOAX-S-250NGB DN250 10" Nitrile Gearbox 68 mm 975.70 EUR
AK-BOAX-S-300EGB DN300 12" EPDM Gearbox 78 mm 1,335.79 EUR
AK-BOAX-S-300NGB DN300 12" Nitrile Gearbox 78 mm 1,335.79 EUR
AK-BOAX-S-350EGB DN350 14" EPDM Gearbox 78 mm 2,210.34 EUR
AK-BOAX-S-350NGB DN350 14" Nitrile Gearbox 78 mm 2,210.34 EUR
AK-BOAX-S-400EGB DN400 16" EPDM Gearbox 102 mm 2,657.88 EUR
AK-BOAX-S-400NGB DN400 16" Nitrile Gearbox 102 mm 2,657.88 EUR
AK-BOAX-S-450EGB DN450 18" EPDM Gearbox 114 mm 3,469.94 EUR
AK-BOAX-S-450NGB DN450 18" Nitrile Gearbox 114 mm 3,469.94 EUR
AK-BOAX-S-500EGB DN500 20" EPDM Gearbox 127 mm 4,282.03 EUR
AK-BOAX-S-500NGB DN500 20" Nitrile Gearbox 127 mm 4,282.03 EUR
AK-BOAX-S-600EGB DN600 24" EPDM Gearbox 154 mm 7,210.80 EUR
AK-BOAX-S-600NGB DN600 24" Nitrile Gearbox 154 mm 7,210.80 EUR

All prices net in euro, excl. VAT, for business customers. List prices, subject to change – not a binding offer. All versions PN16, body ductile iron EN-GJS-400-15, disc stainless steel 1.4301, flanges to DIN EN 1092, face-to-face to EN 558 R20, mounting flange to DIN ISO 5211 (F05 to F16 by nominal size), DVGW drinking water approval. Seat EPDM −10 to +130 °C, nitrile −10 to +90 °C. Operation by hand lever with locking plate or reduction gearbox. The price covers the valve. Actuators are separate articles and not included. Versions as of 2026-08-24

Modifications for butterfly valves

Armaturenfabrik Valve Butterfly valve BOAX-S from KSB with handlever

Manually operated butterfly valves

The classic solution for simple applications – robust, cost-effective and without an external power source. Ideal for manual operation with low switching frequency.
Advantages:
  • Simple operation
  • Low maintenance and inexpensive
Disadvantages:
  • Cannot be automated
  • Greater effort with frequent switching
Recommended accessories:
Spindle extensions, reduction gears, suitable gaskets
Learn more
Armaturenfabrik Valve BOAX-S butterfly valve from KSB automated with pneumatic quarter-turn actuator

Pneumatic butterfly valves

Perfect for fast and automated processes – pneumatic actuators ensure short switching times and high reliability.
Advantages:
  • Very fast switching times
  • Ideal for automation
Disadvantages:
  • Compressed air supply required
  • Higher investment costs
Recommended accessories:
Pneumatic quarter-turn actuators, solenoid valves, limit switch boxes
Learn more
Armaturenfabrik Valve Butterfly valve BOAX-S from KSB automated with electric quarter-turn actuator

Electric butterfly valves

The solution for precise control and simple integration into digital systems – perfect for modern systems without compressed air.
Advantages:
  • Precise control
  • Simple integration into control systems
Disadvantages:
  • Longer switching times
  • Sensitive to moisture
Recommended accessories:
Electric actuators, limit switches, ATEX/SIL options
Learn more

FAQs

Which versions are available for the butterfly valve BOAX-S?
EPDM-XU, Nitrile-K, EG.
Yes, with electric or pneumatic actuators.
EN 593, EN 12266-1, ISO 5752-20.

Insulation – In combination with valves and containers

Our insulations are more than just accessories – they perfectly complement valves and systems and increase efficiency, safety and adaptability.
Order and configure now.

We offer:

  • Custom-made insulating pads to fit your valves
  • Heating jacket integration – reliable even under extreme conditions
  • Insulation jackets and pipe insulation for SKID assemblies – ideal for modular systems and complex systems
  • Special solutions for high temperatures – for power plants, the chemical and process industries
Insulations
Heating jackets for valves
Armaturenfabrik Valve insulation High-temperature pipe insulation with IFS-Plast25 insulation pads and IFS-MW20 mineral wool for SKID systems, process plants

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