The operation of the pneumatic actuator of the KAMAZ-4310 has the following features. The supply line includes a compressor 6, a pressure regulator 9 and a moisture separator 8
Compared to other vehicles, the supply line of the KamAZ-4310 does not have a frost protection device and a condensation receiver.
There is no need for them, because the drying of compressed air is provided by a dehumidifier and setting the pressure regulator to create a pressure difference between terminals I and III (see figure) equal to 250 kPa.
This is achieved by the presence of a reinforced check valve spring 9 and an adjusting nut in the regulator.
Return valve 9 works as a differential valve and opens; at a pressure difference in terminals I and III equal to 220...280 kPa.
Scheme of the pneumatic drive of the brakes of the KAMAZ-4310 car
When the check valve 9 is opened, the compressed air pressure in the supply line drops sharply.
At the same time, a thermodynamic effect occurs, characterized by a decrease in air temperature and the condensation of tiny droplets of moisture in it, which is collected in the lower part of the dehumidifier and automatically released into the atmosphere through its drain valve.
Condensed moisture is also removed through the atmospheric outlet of the pressure regulator when it is opened.
In the protective valve block * of the KamAZ-4310 vehicle, a single protective valve 70 was used instead of a double one, since the KamAZ-4310 vehicle does not have an emergency brake release system.
On these vehicles, the parking brake pneumatic actuator is designed as follows; that the release of the energy accumulators of the brake chambers is ensured immediately after the engine is started, regardless of the presence of compressed air in the receivers.
Two-line bypass valves 20 and 21 provide air supply from the valve 7 control line directly to the power accumulators in the absence of air in the receivers 19.
In this way, the movement can be started after the parking brake warning lamp goes out.
It should be remembered that if there is no air in the receivers of circuits I and IV (pressure gauge readings), the service brake system does not work and braking must be done with crane 7.
The service brake pneumatic actuator is made almost the same as on other cars.
A special feature is that in circuit I of the front axle brake drive there is no pressure limiting valve, and in circuit II of the brake drive of the rear bogie there is no brake force regulator.
In addition, it should be noted that the brake chambers with 24/24 type energy accumulators with an increased active area of the membrane are used on the rear wheels.