Relief valve

A relief valve is like a safety guard for machines or equipment that use liquids or gases under a lot of pressure. Imagine blowing up a balloon really big and then feeling like it's going to burst. You can let go of the air in the balloon by making a small hole in it. This makes sure that the balloon doesn't pop and suddenly let out all the air.

A relief valve works in a similar way. If a machine or a piece of equipment that uses liquids or gases under pressure gets too much pressure, then a relief valve opens up to release some of that pressure. This helps to prevent the machine or equipment from breaking and causing damage or danger.

For example, think of a hot water heater in your house. It's filled with water under pressure that can get dangerously high. If the pressure inside the water heater gets too high, the relief valve will open and let out a little bit of water to relieve the pressure. This helps keep your house safe from potential water heater explosions.

So, relief valves are like tiny holes in a balloon that help prevent explosions by letting out some pressure when it gets too high.