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.
Properly combining trim features to address material handled and environment is important in selecting the correct model valve for its intended service.
Butterfly Valves are generally specified for most air, gas, steam, and liquid applications. They offer an excellent, economically priced, positive shut-off valve for handling materials (e.g. gases and liquids) that are easily displaced by the valve disc as it closes.
When handling this type of material, butterfly valves provide a reliable, bubble-tight, bi-directional shut off.