A butterfly valve is a type of valve used to control the flow of a fluid in a pipeline. It is called a butterfly valve because of its shape, which resembles that of a butterfly. The valve consists of a disc that rotates around a shaft located at the center of the valve body. When the disc is in the open position, the fluid can flow freely through the valve. When the disc is in the clo... https://www.growmechanical.com/butterfly-valves-types-selection-and-applications-pdf/