What is a butterfly valve?
A butterfly valve is a very compact valve type.
There is a rotatable circular disk mounted in a round housing, which is lined with a sealing material. By rotating the disk 90 degrees, a fully open or closed position is reached. But also positions in between are possible, so that the flow can be regulated.
Butterfly valves are almost always mounted between pipe flanges. There exist butterfly valves with welding ends but such valves are very large in size.
The position of the lever indicates the position of the disc, so you can visually check if the valve is in the correct position.
Types of butterfly valves
Ring type butterfly valves
Ring type butterfly valves don't have flanges or other connections, they must be clamped between two pipe flanges. Therefore they are suitable only as inline valve and unsuitable as end valve in a piping system.
An advantage of this type is that they can be rotated in any desired position.
Mono flange type butterfly valves
This type of butterfly valve is clamped between two pipe flanges when mounted in a piping system. Because the valve is provided with one flange, it is also possible to use it as the end shut-off valve in a (low pressure) piping system.
Lug type butterfly valves
This type has tapped holes around the housing. A lug type butterfly valve can be mounted between two pipe flanges, but a function as an end valve in a pipe system is also very suitable.
Double flange type butterfly valves
Butterfly valves, which are provided with two flanges, are mainly used for larger diameter pipes. This butterfly valves are considerably larger in dimensions than the types of which are described above.
When are butterfly valves used?
Where are ball valves used?
Advantages of butterfly valves
Disadvantages of butterfly valves
Butterfly valves are available in a wide range of materials:
3D CAD models