Centric with fixed liner

Our fixed liner butterfly valves are among the very few of its kind and offer superior advantages.

An outstanding seating concept is the heart of the valve. The rubber is vulcanized directly on the valve body forming a permanent bond with an optimal rubber shore hardness. Consequently, there is no risk of deformation or dislocation of the liner. The valves are therefore suitable even under vacuum conditions.

The disc has a profiled sealing edge which requires minimal deformation of the liner to achieve a tight sealing. This gives less wear of the liner and low operating torques.

Feature summary

  • Fixed liner design with vulcanized liner gives:

    • no tolerance problems between body and liner

    • no risk of deformation or dislocation, thus suitable under vacuum conditions

    • optimum shore hardness of the rubber

  • AVK rubber liner with excellent ability to regain shape after compression

  • Disc with profiled sealing edge gives less wear of liner

  • Low operating torques due to fixed liner, profiled disc and shaft bearings

  • Streamlined disc prevents turbulence, pressure drops and valve vibration

  • Available as wafer, semi lug, full lug, double flanged short and double flanged long in DN40-2000 with any type of actuation

Specifics about the product range

Valve function: Isolating or regulating

Actuation: Lever, wormgear, pneumatic and electrical actuators

Materials: Shaft of stainless or duplex steel, disc of stainless or duplex steel or rilsan coated ductule iron, and liner of EPDM (for use with drinking water or high temperatures) or NBR


The centric butterfly valve with fixed liner can be used in a number of applications within water and wastewater treatment, fire protection and gas supply.

Water: water treatment, water distribution, pumping installations, water transmission and HVAC

Wastewater treatment: aeration systems, clean wastewater, filter installations, pumping installations and membrane installations

Fire protection: indoor and outdoor

Gas supply: natural gas and flare gas