What is the primary function of the relief valve on a DOT container?

The primary function of the relief valve on a DOT container is to release excess pressure. This component is crucial for ensuring the safety of the container and its contents. In the case of liquefied petroleum gas (LP gas) and other pressurized substances, pressure can build up due to changes in temperature or volume. If the pressure within the container exceeds a safe threshold, the relief valve automatically activates to vent gas and prevent the container from bursting or exploding.

This mechanism is designed to maintain safe operating conditions and protect both equipment and personnel. By allowing excess pressure to escape, the relief valve helps to manage the internal environment of the container, ensuring it operates within specified limits. This function is vital because high-pressure situations can lead to dangerous scenarios.