What is the maximum temperature rating for relief valves on a low-pressure boiler?

The maximum temperature rating for relief valves on low-pressure boilers is set at 275°F. This specification is in accordance with safety standards designed to ensure that the relief valves can operate effectively without the risk of failure due to exposure to excessively high temperatures. Relief valves are critical for maintaining safe operating conditions in a boiler system; they are designed to release excess pressure and prevent catastrophic failures. The established temperature limit helps in maintaining the integrity of the valve materials and the effectiveness of their operation, ensuring they can function properly when needed under normal conditions.

Options that exceed this temperature limit, such as those at 300°F or 350°F, would not be appropriate for low-pressure systems as they would compromise the valve's safety mechanism and reliability. Maintaining proper temperature ratings is essential for the safety and efficiency of boiler operations, thereby emphasizing the importance of adhering to the standards set for relief valves.