What is the maximum PSI for spring-loaded pop style safety valves?

The correct answer is based on the specifications and regulations governing the operation of spring-loaded pop style safety valves. These safety devices are critical components in pressure systems, designed to prevent the buildup of excessive pressure that could lead to equipment failure or catastrophic damage.

For spring-loaded pop style safety valves, the maximum allowable pressure limit is often set at 600 PSI. This is consistent with safety standards that dictate the operational capabilities and reliability requirements of these valves to ensure safe usage in various applications. At this pressure, the valve can reliably open to release excess pressure, thus protecting the system from overpressure conditions.

In contrast, the other options provided reflect lower or higher pressure limits that do not align with standard practices and regulations related to spring-loaded safety valves. For instance, values below 600 PSI, such as 100 PSI or 300 PSI, would typically correspond to different types of valves or applications, while 900 PSI exceeds the operational limits recommended for standard pop-style safety valves, which could lead to safety risks if utilized under such conditions. By understanding this context and the role of these valves, it is clear why 600 PSI is recognized as the maximum for such equipment.