A butterfly valve, also known as a disc valve, is a type of simple structured control valve. In a butterfly valve used for switch control of low-pressure pipeline media, the closure element (valve disc or butterfly) is in the form of a circular disc that rotates around the valve axis to achieve opening and closing.
These valves are used to control the flow of various types of fluids, including air, water, steam, corrosive media, slurry, oil, liquid metals, and radioactive substances. They primarily serve the purposes of cutting off and throttling in pipelines. The closure element of a butterfly valve is a circular disc-shaped butterfly plate that rotates around its own axis within the valve body to achieve the purpose of opening, closing, or regulating.
A butterfly valve is a type of valve that opens, closes, or regulates fluid flow by rotating a circular disc closure element around 90 degrees. Butterfly valves are not only characterized by their simple structure, small size, lightweight, material efficiency, compact installation dimensions, low driving torque, and ease of operation but also possess good flow regulation and sealing capabilities. They have been one of the fastest-growing valve types in recent years. The use of butterfly valves is extremely widespread. The variety and quantity of their applications continue to expand, reaching towards higher temperatures, pressures, larger diameters, better sealing, longer lifespans, excellent regulating characteristics, and multi-functional development. Their reliability and other performance indicators have reached high levels.
The opening and closing of a butterfly valve usually require less than 90 degrees of rotation. Butterfly valves and their stems do not possess self-locking capabilities inherently. To position the butterfly disc accurately, a worm gear reducer is installed on the valve stem. Using a worm gear reducer not only provides the butterfly disc with self-locking capabilities to hold the disc in any position but also enhances the operational performance of the valve.
Specialized industrial butterfly valves have features that include high-temperature resistance and a broader pressure range. These valves have larger nominal diameters, carbon steel valve bodies, and metal ring seals instead of rubber rings. Large high-temperature butterfly valves are manufactured using welded steel plates and are mainly used for high-temperature media in flue gas ducts and gas pipelines.