First of all, the core of the design of the four-circuit protection valve is that it can cleverly divide the entire vehicle air circuit into four circuits that are both interdependent and independent of each other. This design allows the remaining circuits to maintain normal operation and inflation when any circuit fails.
In specific applications, according to different needs, the four circuits can be connected in parallel, the air pressure can be charged at the same time, or two circuits (such as 2 circuits before 4 circuits) can be inflated first. Some models of four-circuit protection valves are also equipped with bypass holes to ensure that when a circuit fails, the brake system can quickly start to inflate from 0 bar.
In addition, the four-circuit protection valve combines the functions of the pressure regulating valve and the diverter valve in structure. Under normal circumstances, it is similar to a five-way joint, but when a circuit breaks or leaks, its protective function becomes particularly important. Common faults include pipeline blockage or leakage. At this time, it is necessary to check whether the four-circuit protection valve and the one-way valve are stuck, or whether the diaphragm is broken.
For diesel vehicle gas pumps, the four-circuit principle is also based on this interconnected and independent circuit design. Inside the four-circuit valve, four pressure-limiting check valves are arranged in a specific way to ensure that the branch supply originating from the commercial vehicle brake system can ensure the independent normal operation of each circuit.
Finally, in terms of working principle, the air compressor compresses the air under the drive of the engine and sends the high-pressure gas to the air dryer through the air pipeline for processing. After drying and pressure regulation by the pressure regulating valve, the high-pressure gas is finally output to the specific interface of the four-circuit protection valve to achieve air pressure distribution and protection.
