Installation of AVK butterfly valves with loose liner

Centric butterfly valve with loose liner

The AVK Series 76 is a wide range of concentric, loose liner butterfly valves available in both flanged, wafer and lug design and with AVK's own high quality rubber liner that significantly increases the service life. The one-piece replaceable liner also serves as a profiled flange gasket and comes in either drinking water approved EPDM, high temperature EPDM or hydrocarbon resistant NBR. Disc material is stainless steel or epoxy coated ductile iron. The shaft in stainless steel, installed in low friction PTFE bearings in an anti-blow out design plus the unique disc sealing profile results in low operating torque and long life.

AVK butterfly valve loose liner series 820

Cutaway of AVK butterfly valve, series 820

Design features of AVK centric butterfly valves with loose liner
• Ductile iron body
• Loose, replaceable liner in drinking water approved EPDM with reinforced seating area and integrated, profiled flange gaskets
• Shaft seal integrated in the liner
• Anti-blowout shaft design with an anti blow-out plate at the top and a plug at the bottom
• Radial bearings in low friction bronze/PTFE composite; thrust bearing in polyacetal (POM)
• Slim disc design with internal hexagon for drive shaft connection
• Epoxy coating, blue RAL 5017

Wafer, lug and U-section with flanges – with all types of actuators
• 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 application with frequent operation

• Loose liner butterfly valves are typically a cost-effective solution for applications above ground where replacement and maintenance is relatively easy. The liner is replaceable without a full replacement of the valve and the design gives more options for different liner materials.
• 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