The pressure regulator is designed to regulate the pressure of compressed air coming from the compressor

Compressed air from the compressor through output IV (Fig. 1) of the regulator, filter 2, channel 12 is supplied to the annular channel 9.

Compressed air flows through check valve 10 to outlet II and further into the car's air cylinders.

At the same time, through channel 8, compressed air passes into the cavity "A" under the piston 7, which is loaded with a balancing spring 5. In this case, the outlet valve 4 is open, and the inlet valve 11 is closed.

Pressure regulator for air brake system of Ural car

Unloading valve 1 is closed under the action of a spring. In this state of the regulator, the pneumatic system of the car is filled with compressed air from the compressor.

When the pressure in the "A" cavity is equal to 800 kPa (8.0 kgf/cm2), piston 7, having overcome the force of spring 5, rises, the valve 4 closes, the inlet valve 11 opens and compressed air from the cavity "A" enters the cavity "B".

Under the action of compressed air, the unloading piston 13 moves down, valve 1 opens and the compressed air from the compressor through outlet III exits into the atmosphere along with the condensate accumulated in the cavity, while the check valve 10 closes.

When the pressure in outlet II and cavity "A" drops to 637 kPa (65 kgf/cm2), piston 7 moves down under the action of spring 5, valve 11 closes , exhaust valve 4 communicates cavity "B" with the atmosphere through port I.

At the same time, the unloading piston 13 closes under the action of the spring, and the compressor again pumps compressed air into the pneumatic system.

Pressure regulator for air brake system of Ural car

Relief valve 1 also serves as a safety valve.

If the regulator does not work at a pressure of 800 kPa (8.0 kgf/cm2), then when the pressure rises to 1000-1300 kPa (10-13 kgf/cm sup>) valve 1 opens and releases pressure.

Regulator adjustment is made by bolt 6, when tightening which the switching pressure increases, and when unscrewed, it decreases.

The set pressure of the safety valve is adjusted by changing the number of gaskets installed under the valve spring.

The correct operation of the pressure regulator is determined by periodically monitoring the amount of air pressure during engine operation using a two-pointer pressure gauge on the instrument panel and the frequency of operation of the regulator.

During the period of operation, the following malfunctions may occur: valve wear, clogging of the throttle hole in the piston.

The regulator is installed on the left side member behind the third cross member of the vehicle frame.

It is more convenient to remove the regulator when the car is installed on the inspection ditch.

To remove the regulator from the car, unscrew the union nuts of the pipelines connecting the regulator to the compressor and the air cylinder, unscrew the nut, remove the washer and the regulator assembly.

The pressure regulator must be disassembled and repaired by qualified personnel in specialized workshops.

Replace damaged parts during repair.

If the limits of operation of the unloader or safety valve are violated, they should be adjusted to the pressure at which the regulator starts turning off the compressor from the pneumatic system of the car, it is regulated by a bolt.

You can also see the article "Brake Regulator"