A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping. There are many types of valves, and they are most commonly used on automobile, motorcycle, and bicycle tires, but also for many other applications.
A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping. There are many types of valves, and they are most commonly used on automobile, motorcycle, and bicycle tires, but also for many other applications.
Source: Wikipedia "Valve stem" · CC BY-SA 4.0
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