Butterfly valve (ARI)

A butterfly valve comes from a family of valves called quarter turn valves. In operation, the valve is fully open or closed when the disc is turned a quarter turn. The “butterfly” is a metal disc that is mounted on a pole. When the valve is closed, the disc is rotated to completely block the passage. When the valve is fully open, the disk is rotated a quarter of a turn so that the liquid can pass through almost without restriction. The valve can also be opened gradually to throttle the choke current.
There are different types of butterfly valves, each suitable for different pressures and uses. The zero-offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high-performance, double-offset butterfly valve used in slightly higher pressure systems is offset from the centerline of the disc seat and body gasket (offset one) and the centerline of the bore (offset two). This creates a cam effect during operation to lift the seat out of the seal, which results in less friction than in the zero point shift and reduces its tendency to wear. The valve that is best suited for high pressure systems is the triple offset butterfly valve. With this valve, the contact axis of the disc seat is offset, which practically rules out sliding contact between the disc and seat. In the case of triple-staggered valves, the seat is made of metal, so that it can be machined in such a way that a bubble-tight shut-off is achieved when it comes into contact with the disc.
ARI Armaturen Prodects:
Application: Industry, powerstations, flue gas purification plant, processing technology, gas supply, vapour facilities, recycling facilities, vacuum facilities, hot water, heating technology, district heating, thermal oil applications, general plant manufacturing, etc.
For further information : ari-armaturen.com