When water pressures exceed what value shall valves be utilized in accordance with their ratings?

The appropriate water pressure at which valves should be utilized in accordance with their ratings is 175 psi. This value is significant because it represents a threshold where structural integrity and performance of the system components become critical. If the water pressure in a sprinkler system exceeds this rating, it can lead to failure of the system's components, including valves, which may not be designed to safely handle the increased pressure. By adhering to the 175 psi limit, the system ensures reliable performance and reduces the risk of leaks or catastrophic failures. This guideline helps maintain the safety and efficacy of fire protection systems in various environments.