Valves are often chosen for economic reasons. This is especially true of butterfly valves. One reason for choosing butterfly valves is their lower installation cost. Installation costs are lower because reducers are usually not needed, as butterfly valves tend to be pipe sized.
In addition, butterfly valves use less metal in their manufacturing process, which makes them cheaper and also means they weigh less, reducing the need for support.
Another reason people choose butterfly valves is that they can be more compact. This is especially important for packaging plant suppliers, who are always trying to reduce the overall enclosure size of their equipment.
Often, butterfly valves are installed in secondary circuits where the adjustment position is not critical, or in circuits where the system pressure drop must be limited.
Or the designer needs a valve that is the same size as the pipeline with few obstructions in the flow path. The use of butterfly valves in these applications may not present any problems.
But problems often arise, and that's when the end user is faced with a difficult choice. Butterfly valves are inherently linear, with control ranging from 25% to 50% of valve travel in most applications.