What is a common safety feature found on steam boilers?

Safety valves are critical components of steam boilers because they are designed to prevent the build-up of excessive pressure within the system. When a steam boiler operates, steam is produced and pressure builds up within the boiler. If this pressure exceeds the design limits, it can pose a serious hazard, including the risk of explosions. Safety valves automatically open when the pressure reaches a preset level, allowing steam to escape and thereby reducing the pressure to safe levels. This function is vital for ensuring the safe operation of the boiler and protecting both the equipment and personnel in the vicinity.

The other features, while they may contribute to the overall functioning and efficiency of the boiler, do not serve the same critical role in safety. For instance, automatic feedwater control helps maintain water levels but does not directly address pressure issues, high-efficiency burners primarily focus on fuel use efficiency rather than safety, and digital temperature displays provide information without actively preventing dangerous conditions. Therefore, the unique role of safety valves in preventing overpressure situations solidifies their status as a common and essential safety feature in steam boilers.