What type of valves prevent systems from over-pressurization?

Relief valves are specifically designed to prevent over-pressurization in a system by automatically releasing excess pressure. When the pressure within a system exceeds a predetermined limit, the relief valve opens to allow fluid to escape, thereby reducing the pressure to a safe level. This mechanism is crucial in safeguarding equipment and maintaining operational integrity, particularly in applications involving gases or liquids where pressure buildup could lead to hazardous situations.

Other types of valves serve different functions, and while they are important for system operation, they do not specifically function to prevent over-pressurization. Globe valves are primarily used for regulating flow due to their ability to maintain a stable flow. Butterfly valves are generally used for isolating or regulating flow swiftly in large volumes due to their simple design and lightweight nature. Control valves adjust the flow or pressure in a system but do not have the built-in safety feature of relieving excess pressure like relief valves do. Thus, relief valves are uniquely suited for the purpose of preventing over-pressurization.