Centric butterfly valve with loose liner

AVK range of loose liner butterfly valves comprises wafer, lug and U-section butterfly valves in DN25-1600 with a variant selection of disc and liner materials. Actuations available are lever, gearbox with hand wheel, electrical or pneumatic actuators.

Replaceable liner has a very robust construction. Its convex form and integrated lip sealings in the shaft passage ensure a tight connection with the shaft.Furthermore, the special shape ensures a unique grip to the body preventing any relative liner displacement during operation. The integrated gasket faces enable easy installation between flanges.

Feature summary 

  • Stainless steel shaft with anti-blowout design and position indication
  • Square driven disc mechanism with effective power transmission
  • Disc of acid-resistant stainless steel with streamlined shape for optimum flow characteristics and polished edges for minimum wear of the liner
  • Replaceable EPDM liner with a unique design 
  • Ductile iron body with extended neck for insulation and 200my fusion bonded epoxy coating 

Standard range

  • Wafer DN25-1000, lug DN25-600, U-section DN150-1600
  • EPDM rubber liner for drinking water (max. 70°C) and wastewater/HVAC (max. 110°C)
  • Lever, gearbox, pneumatic or electric actuator

Variants for frequent operation

  • Wafer DN25-400, lug DN50-400
  • EPDM rubber liner for wastewater aeration/HVAC (max. 130°C), self-lubricating PTFE coated steel bearings and 200 μm polyurethane coating


The centric butterfly valve with loose liner can be used for a wide range of applications within water and wastewater treatment as well as for industrial water applications.

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

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

Industrial water: cooling water and process water


Centric butterfly valves with loose liner

Animation about features and variants of our butterfly valves series 820

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