At what PSI does the overpressurization safety valve open?

The overpressurization safety valve is designed to protect the system by releasing pressure when it reaches a specific threshold to prevent damage or dangerous conditions. In the context of the T-6 aircraft, the overpressurization safety valve opens at 4.0 PSI. This means that when the pressure in the system exceeds 4.0 PSI, the safety valve activates to vent excess pressure, ensuring the integrity and safe operation of the aircraft systems. This value is critical for maintaining safety standards during operations. Understanding the specific pressure at which this valve operates is essential for operators and maintenance personnel to prevent overpressure situations that could lead to equipment failure or safety hazards.