The tire pressure regulation system allows you to control the pressure and maintain it within the normal range, as well as increase the vehicle's patency by reducing the air pressure in the tires

It makes it possible to continue driving the car in case of a puncture chamber without changing the wheel (the wheel valves of undamaged wheels must be closed) if the air supplied is sufficient to constantly maintain the required pressure in the tires.

Scheme of the swap system of the Ural car

Single-wire air supply to the tires.

The tires of all wheels with open valves are interconnected, the pressure in them is the same and is regulated simultaneously.

The spool-type pressure control valve consists of a body 7, in which cuffs 10 and a spool 12 are installed.

When the spool moves along the axis, the annular groove on it connects the valve cavity with the atmosphere or the discharge line.

Restrictor valve used to turn off the tire inflation system when the air pressure in the vehicle's pneumatic system drops below 600 kPa (6 kgf/cm2), adjust with bolt 14.

The block of cuffs 22 of the air supply consists of four cuffs installed in the trunnion (casing) of the bridge.

Cuffs provide a tight connection between the channels of the fixed trunnion (casing) and the channels of the rotating axle shaft.

Wheel hub with inflation system for Ural car

Use and maintenance of the system

After opening the wheel valves, purge the tire pressure control system with air from the tires.

To do this, set the control valve handle to the "RELEASE" position, reduce the pressure in the tires by 0.03-0.05 MPa (03-0.5 kgf / cm2), then bring tire pressure up to the pressure corresponding to the road surface.

Purge the air pressure control system also before parking the car and after each departure from a warm garage.

Ural car tire pressure control valve

Determine the air pressure in the tires on the pressure gauge with the pressure control valve lever in the neutral position and the wheel valves open.

Removing and installing the air cuff unit parts

To ensure separate regulation of air pressure in the tires of any axle, close the wheel valves on other axles.

If there is a drop in pressure, then close the wheel valves and, by opening them one by one, determine which tire is leaking air.

Tire pressure depending on road surface

The nature of the road surface








car, km/h

Wetted meadow,


0.5 - 0.75


Loose sand, wet arable land,

virgin snow

0.75 - 1.4


Wet dirt roads, loose soil,

damp meadow

1.4 - 1.7


Roads of all types

(only for the swap period)

From 1.5 to 3.2


If it is necessary to reduce tire pressure, set it depending on the driving conditions.

Maintenance of the system consists in checking its tightness.

Locate large leaks by ear, weak leaks with soapy emulsion.

Remove air leaks through the connections by tightening or replacing a separate element of the connection.

If the pressure control valve, wheel valves and pipe connections were leak-tight during the test, then the leak is through the air supply cuffs. If there is a large leak, replace the cuff.

The reliability of the air supply cuff unit, first of all, depends on the presence and condition of the lubricant on their rubbing surfaces.

When installing the seals, lubricate these surfaces and put grease in the cavity between the first and second, as well as between the third and fourth seals.

When installing the axle shaft, also carefully lubricate the surface of the working neck, and the lubricant should not get into the air supply hole.

Mount the cuffs with a special mandrel (position III, which excludes the possibility of damage when they are pressed in.

Remove the cuffs with a special puller (position I and II) that is included in the tool kit.

In case of significant damage to the air pressure control system, inflate the tire using the hose provided in the driver's tool kit, connecting it to the air bleed valve and, in turn, to the wheel valves.