What is the primary function of a safety valve in a steam system?

The primary function of a safety valve in a steam system is to relieve excessive steam pressure. Safety valves are crucial components designed to protect equipment and prevent potential hazards by releasing steam when pressure exceeds a predetermined limit. This helps to ensure that the system operates within safe pressure limits, preventing catastrophic failures such as explosions or equipment damage.

When pressure builds up in the steam system beyond what is deemed safe for operation, the safety valve opens automatically to allow excess steam to escape. This action not only protects the integrity of the boiler and associated piping but also enhances operational safety by preventing conditions that could lead to unsafe incidents. Thus, the correct answer emphasizes the safety role that is central to the design and function of steam systems in various applications.