At what PSI does the overpressurization safety valve open?

The overpressurization safety valve is a critical safety feature that is designed to prevent excessive pressure in a system, which could lead to catastrophic failure. The valve is set to open at a specific pressure to ensure safe operation and to protect the system by venting excess pressure. In this context, the correct answer indicates that the valve opens at 4.0 PSI. This setting is designed to allow for a margin of safety, ensuring that the pressure does not exceed safe operational limits.

Understanding the correct opening pressure is essential for anyone working with systems that utilize this kind of safety feature. It highlights the balance between sufficient pressure for operation and the need to prevent damage or dangerous situations caused by overpressurization. The other options do not align with the specification for this safety component, indicating either lower or higher pressures that would compromise the safety measures in place. This understanding is vital for maintaining equipment and ensuring safety standards are upheld.