What is the relief valve setting built into the UAC?

What is the relief valve setting built into the UAC?

• A. 225 psi
• B. 1125 psi
• C. 4500 psi
• D. 150 psi

Answer: (C)

The key idea is safety against overpressure on the high‑pressure side of the SCBA. The Universal Air Connection has a relief valve to vent excess pressure and protect the cylinder, hoses, and regulators. For standard SCBA bottles, the system’s maximum safe pressure is 4500 psi, so the relief valve is set at 4500 psi. Under normal operation the pressure is regulated down to about 100–135 psi for the user, and the relief valve stays closed. It only opens if something drives the pressure above the safe limit, preventing damage. The other numbers aren’t used because they aren’t the standard protection level for a typical SCBA high‑pressure system.

The key idea is safety against overpressure on the high‑pressure side of the SCBA. The Universal Air Connection has a relief valve to vent excess pressure and protect the cylinder, hoses, and regulators. For standard SCBA bottles, the system’s maximum safe pressure is 4500 psi, so the relief valve is set at 4500 psi. Under normal operation the pressure is regulated down to about 100–135 psi for the user, and the relief valve stays closed. It only opens if something drives the pressure above the safe limit, preventing damage. The other numbers aren’t used because they aren’t the standard protection level for a typical SCBA high‑pressure system.