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Bellows sealed valves are specialized valves used primarily in industries that require high levels of leak prevention and reliability, such as chemical, pharmaceutical, food processing, and nuclear power. These valves are designed to ensure a tight seal, preventing the leakage of gases or liquids. The key distinguishing feature of a bellows sealed valve is the use of a bellows as the sealing element, which isolates the valve stem from the environment and eliminates the need for traditional stem seals. In this article, we will explore the construction, working principles, advantages, applications, and maintenance considerations of bellows sealed valves.