When viewing the wheels of most Soviet trucks developed and produced in the second half of XX century, a logical question may arise: what kind of strange contraption flaunts on metal disks? From the outside, it looks like some kind of metal handle. However, this is hardly anything to her. Let's try to figure this out.
Of course, the strange protruding contraption on the wheels of Soviet trucks is not a handle or an element of decoration, but a metal plug that performs protective functions. If necessary, the plug can be removed by unscrewing a few reliable bolts. An air hose is hidden under the plug, which is connected to the limiter valve (tire nipple) and is part of the TsSPK - the central wheel inflation system.
In the Soviet Union, not only trucks, but also army off-road vehicles and various all-terrain vehicles were equipped with a central wheel inflation system. Used by TsSPK to control the level of pressure in the wheels. The system can both increase it by pumping it, and lower it by releasing part of the air from the tires. In the event of a tire puncture and air leakage, the CSPK will allow the car to stay on track for a long time.
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In this case, sometimes the pressure in the wheels has to be lowered, for example, when driving on difficult terrain, where there is a risk of wheel spin. The central inflation system is controlled directly from the driver's cab. There are also several pressure indicators and a lever to control the system. At the same time, the pressure gauge indicates what pressure in the wheels is optimal for different types of coatings: soil, sand, snow, etc. Initially TsSPK was created for the needs of the military, but today such systems are also installed on many civilian cars, primarily agricultural machines.
If you want to know even more interesting things, then you should read about Why do people like pickups so much in the US?, and we do not look in their direction.
A source: https://novate.ru/blogs/161021/60902/