Which component is designed to vent excess pressure from a propane system?

• A. Regulator
• B. Release Valve
• C. Check Valve
• D. Shutoff Valve

Answer: (B)

Excess pressure must be released to prevent a dangerous buildup, and a release valve is the component specifically designed for that safety function. It stays closed under normal operating pressure and opens automatically when pressure climbs beyond a preset limit, venting gas to the atmosphere or a vent line to relieve the system. The regulator’s job is to lower the high input pressure to a safe, usable level and maintain it, not to vent excess pressure. A check valve prevents backflow, and a shutoff valve simply stops the flow of gas. So, the device that vents excess pressure is the release valve.