What would happen if the container did not have a pressure- release valve?

If a container lacks a pressure-release valve, it can lead to a dangerous buildup of pressure inside. As pressure increases, the risk of structural failure or explosion becomes significant, potentially causing hazardous spills, injuries, or damage to surrounding areas. In extreme cases, the container could rupture catastrophically, posing serious safety risks to people and the environment. Therefore, pressure-release valves are essential for safe operation in pressurized systems.