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Butterfly Valves are fittings that are quickly used to control flow. They are comprised of a circular metal piece with pivoting parts at 90 degree angles. When butterfly valves are turned, they seal within the valve. Once the valve is sealed, fluid cannot become trapped within. There are several ways to seal the valve, including an electrical wire actuator. It is also possible to use several different connection types with these valves. In the use of compression fittings, though, washers must also be used.

They are available in several different types. In the flange version, thin valves are placed between two flanges. In the lug type, the valves have metal implants in the bolt openings and they are placed between flanges using different bolts for each flange. Butterfly valves have several attributes when they are appropriately used. They are great for many different chemical services, they come in small sizes that can help with space concerns, and they offer an excellent rate of flow. One difficulty, though, is that they are tough to clean. They should not, therefore, be used in situations that call for sterile environments. Butterfly valves can be made of any material. Most metal butterfly valves, though, are protected through processes like anodizing to offer a stronger result. They also are offered as molded & cast urethane products for the same reason.

Some companies are beginning to replace metal butterfly valves with PVC ones because of the benefits involved. For the last several years, the industrial world thought the best material for butterfly valves was metal because it was tough, strong, and reliable. However, valve life is often shortened by corrosion. Additionally, wear resistance and strength based on unit weight are primary concerns. PVC butterfly valves are lightweight, completely corrosion, impact, and UV resistant, and offer extreme durability. As a result, many industries are switching to this type of valve. PVC valves are made through liquid chemical reactions. The resulting product is then poured into a mold and heated in ovens until it takes the desired shape. This new type of valve can even be used for sensitive applications like dust collecting systems.