Bianca butterfly valves are suitable for extreme applications with maximum safety

Butterfly valves with PTFE lining: versatile, reliable and sustainable

Bianca is the centric, PTFE-Iined butterfly valve for aggressive fluids and high-purity applications, available in the sizes DN 32 - DN 900. Bianca butterfly valves have been designed and manufactured in Switzerland for over 20 years. The design of the Bianca butterfly valve is built for long-lasting use in highly demanding media and environments. 

To meet the requirements of various industrial applications, the Bianca is available with a ductile iron or stainless steel body. Thanks to the extensive range of conductive disc and liner materials, it can even be used in explosive environments. The high availability of semi-finished components enables short delivery times, even on large sizes up to DN 900.

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Superior technical features

  • Reliable shaft sealing system thanks to safety shaft sealing, high liner collar and shaft with PFA overmoulded
  • Increased service life thanks to the chambered liner, which prevents cold flow at the flange sealing surface
  • Low friction and extended service life thanks to PTFE liner in combination with PFA-overmoulded disc
  • Minimum deformation of the liner due to the elastomer backliner embedded in the body
  • Blow-out proof shaft and excellent Kv values based on the one piece disc/shaft
  • ISO top flange for modular actuator mounting
  • Stainless steel valve label according to EN 19 for full traceability
  • External shaft sealing to protect the valve neck hole
  • High-performance self-lubricating and maintenance-free bushing
  • Centring holes covering multiple flange connections

For every application, the right combination of materials

Ranging from mirror-polished stainless steel discs with high-purity Ultraflon® liners for pharmaceutical applications to PFA-coated discs with PTFE liners for the highly corrosive chemical industry - the Bianca butterfly valve can be individually configured for a wide range of applications. High quality and safe and reliable operation are always paramount.

Liner materials

  • PTFE
  • PTFE antistatic
  • Ultraflon®
  • Ultraflon® antistatic
  • Ultralene™

Disc materials

  • PFA
  • PFA antistatic
  • Stainless steel
  • Hastelloy
  • Duplex
  • Full metal discs mechanically polished Ra < 0.8
  • Stainless steel electro polished Ra < 0.4 / Fe < 1%

Temperature range

From -20 – to +200 °C

Working pressure (max)

  • 2,5 bar
  • 6 bar
  • 10 bar
  • 16 bar

Body type

  • Wafer
  • Lug
  • U-section

Nominal diameter

  • DN 32 up to DN 900

AVK Industrial Nederland BV is your supplier for InterApp industrial valves on the Dutch market.

InterApp, headquartered in Switzerland, is an international player in the field of high quality butterfly valves. InterApp butterfly valves are suitable for industrial applications such as water treatment, chemical processing, energy supply, pharmaceutical industry, pulp and paper industry, oil and gas, steel and many others. InterApp is part of the AVK Group.

The AVK Group is a worldwide renowned manufacturer of high-quality valves, hydrants and accessories for the water, gas, wastewater, fire protection and industry segments. Our products are developed and certified according to the most important international standards.


InterApp Bianca butterfly valves

Bianca butterfly valves are developed for extreme applications with maximum safety