How & Why Are Butterfly Valves Used?
A Butterfly Valve is used to control the flow of material through a circular pipe or tube. Typically the material is air, gas, steam, or liquid. Certain dry materials may also be handled through a butterfly valve. Simply, a butterfly valve consists of a circular disc with its pivot axis at right angles to the direction material is flowing. The valve is made up of a body, seat, disc, stem, and actuator. Each component part is available in a variety of materials called trim features. Properly combining trim features to address material handled and environment is important in selecting the correct model valve for its intended service. Body A butterfly valve body can be made of cast iron, ductile iron, aluminum, carbon steel, stainless steel and exotic metals. Butterfly valves are available in wafer and lug style. Wafer style valves are installed sandwiched between pipe flanges. This style of valve is easier to replace or install. However, replacing a wafer valve requires the conveying lin
