RV of some domestic truck can be seen just such a mysterious pipe. Why is it necessary? It is obvious that this is some important structural element. Most often, such a tube is found on the wheels of the machine army. In fact, everything is quite simple. There they KAMAZ, ZIL, URAL and not only.
So what is this mysterious metal tube that goes from the wheel center to the edge? It may seem that this is some kind of handle. In fact, nothing of the sort. Metal part is nothing more than a protective cover that covers the central pressure control system tire. The metal plate covers a tube, which is the most vulnerable element in the system.
What is the use of centralized control system of the pressure in the tires? In order in the case of puncture of one wheel when driving on the solid coating has the possibility maintain pumping tires and thus to be able to keep going, despite the partial loss pressure. In addition, this system is used to reduce the existing pressure before you start to move over rough terrain. This function is vital for trucks, especially military vehicles.
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pressure monitoring system is controlled directly from the cab. To do this at the disposal of the motorist on the dashboard has a special switch and pressure gauge.
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A source: https://novate.ru/blogs/240819/51499/