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Working Principle and Application Areas of High-temperature Butterfly Valves
A high-temperature butterfly valve is a device used to control fluid flow and regulate its volume under high-temperature conditions. It uses a butterfly disc as the closing element, which rotates approximately 90 degrees to open or close the valve. The key components include the valve body, butterfly disc, valve stem, high-temperature sealing materials, and electric actuator. The electric actuator receives control signals and drives the valve stem, thereby moving the butterfly disc. In high-temperature environments, the valve material must be able to withstand prolonged thermal stress, while the sealing mechanism must prevent leaks caused by thermal expansion.
Compared to other types of high-temperature valves, such as high-temperature gate valves or ball valves, high-temperature butterfly valves have structural differences. Gate valves use a vertically moving gate to block the flow of the medium; however, their sealing surfaces are prone to wear due to high temperatures, and the opening and closing times are relatively long. Ball valves control flow by rotating a sphere, but the torque required increases significantly in large-diameter pipes operating at high temperatures. The butterfly valve’s disc is lighter and thinner, resulting in less fluid resistance during rotation. This reduces the amount of force needed to operate the valve at the same diameter, thereby lowering energy consumption in high-temperature, high-flow systems. Additionally, butterfly valves are generally shorter in length, making them more suitable for installation in high-temperature pipelines where space is limited.
Thermal adaptability is a key technical characteristic of electric high-temperature butterfly valves. The valve body and butterfly disc are typically made of heat-resistant alloy steel or stainless steel, such as 310S or 304H. These materials maintain their mechanical strength and creep resistance even under continuous high temperatures. Sealing materials usually include metal hard seals or flexible graphite composite structures. Metal seals rely on precisely manufactured sealing surfaces to achieve tight contact at high temperatures, but this requires high manufacturing precision. Flexible graphite seals utilize their high-temperature resistance and self-lubricating properties to compensate for some thermal deformation. Compared to ordinary rubber or PTFE seals, these materials do not deteriorate rapidly in environments exceeding 300 degrees Celsius.
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