What is the function of a relief valve on a propane tank?

What is the function of a relief valve on a propane tank?

• A. Relieve excess pressure
• B. Record weight
• C. Control valve opening
• D. Purge gas

Answer: (A)

Propane in a tank expands when temperature rises, so pressure inside can climb. The relief valve is a safety feature that opens automatically when the internal pressure hits a set limit, allowing gas to vent and keeping the tank from overpressurizing or rupturing. It operates independently of the main control valve and isn’t used to measure weight or purge gas. Once the pressure drops back to safe levels, the valve closes again.

Propane in a tank expands when temperature rises, so pressure inside can climb. The relief valve is a safety feature that opens automatically when the internal pressure hits a set limit, allowing gas to vent and keeping the tank from overpressurizing or rupturing. It operates independently of the main control valve and isn’t used to measure weight or purge gas. Once the pressure drops back to safe levels, the valve closes again.