Wide range of butterfly valves
AVK offers one of the widest ranges of butterfly valves at the market that includes both double eccentric butterfly valves and centric butterfly valves with a variety of material configurations and actuation.
AVK has been in the valve business for more than 50 years. From the 90s we started offering butterfly valves from Wouter Witzel, a well-esteemed manufacturer of centric fixed liner butterfly valves founded in 1966 in the Netherlands and since 2005 a member of the AVK Group. The same year we introduced a new range of AVK double eccentric butterfly valves, and in 2010 InterApp Armaturen Holding AG became part of the AVK Group. InterApp was founded in 1969 and is a well reputed manufacturer of centric loose liner butterfly valves produced in Switzerland and Spain.
What is a butterfly valve?
A butterfly valve is a shut-off valve with a relatively simple construction. In closed position, the disc blocks the valve bore while in open position, the disc is turned to allow flow. A quarter turn takes the valve from fully open to fully closed position, or opposite, and thus the butterfly valve allows for quick opening and closure.
On a centric (concentric) butterfly valve the shaft is centered in the middle of the disc and the disc centered in the bore. An eccentric butterfly valve has one or more shafts located offset from the center according to the categories of double offset butterfly valves and triple offset butterfly valves.
Some of the advantages of butterfly valves are the simple and compact construction, and the light weight and lower cost compared to other valve designs.
Double eccentric butterfly valves
Double eccentric butterfly valves are most often used in water supply applications below ground as an alternative to gate valves. When installing butterfly valves below ground a lower bury depth is required and typically they are more cost-effective, especially in the large dimensions, compared to gate valves. They can of course also be used above ground. Read more about double eccentric butterfly valves.Centric butterfly valves
Fixed liner butterfly valves can be used under vacuum conditions as there is no movement and wear of the liner. Furthermore, the fixed liner valve is suitable for high flow velocities and high operating cycles e.g. open/close every few seconds. Fixed liner butterfly valves are typically used above ground, but the double flanged types are also suitable for below ground installations. Available for water, wastewater, gas, fire protection and industry applications. Read more about centric butterfly valves with fixed liner.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. Contact us for more details.
