Respuesta :
If the valve stem is turned counterclockwise as far as possible, the service valve is in the back seated position.
The valve stem is in charge of ensuring that the disk is positioned correctly and giving the disc, plug, or ball the movement they require to open or close the valve. On one end, it is attached to the valve handwheel, actuator, or lever; on the other, it is attached to the valve disc.
A valve stem is a self-contained valve that automatically closes and keeps the chamber sealed by the pressure inside the chamber, a spring, or both to prevent the gas from escaping. It opens to admit gas into the chamber (such as air to inflate a tire). Although they have many other uses, they are most frequently used on tires for cars, motorcycles, and bicycles.
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