Which of the following is a common use of a safety valve?

A safety valve is designed to automatically release pressure from a system when it reaches a predetermined limit to prevent overpressure situations that could lead to equipment failure or catastrophic events. This function is crucial in various applications, such as boilers, pressure vessels, and pipelines, where excess pressure can cause serious hazards, including explosions or structural damage.

In contrast, regulating airflow, controlling liquid flow, or sealing connections are functions that might involve different types of valves or mechanisms. For instance, airflow regulation typically requires damper systems or specific valves designed for that purpose, while controlling liquid flow might involve throttling valves or other flow control devices. Sealing connections is usually the role of gaskets or sealants rather than a safety valve, which is strictly focused on pressure management to ensure the safety and integrity of pressurized systems.