CDL Air Brakes TestDual Air Brake SystemsEasy
Which of the following components is specifically designed to prevent air from flowing from one air tank to another in a dual air brake system, ensuring their independence?
- AThe governor.
- BThe safety valve.
- CThe check valve.
- DThe air dryer.
Show answer & explanationAnswer & explanation
Correct answer: C. The check valve.
Check valves are critical in a dual air brake system. They are one-way valves installed between the wet tank and the primary and secondary air tanks. Their purpose is to prevent air from flowing back from one tank to another, or from the primary/secondary tanks back to the wet tank, thereby maintaining the independence of the primary and secondary systems.
Why the other options are wrong
- A. The governor controls the air compressor's cut-in and cut-out cycles, not inter-tank flow.
- B. The safety valve releases excessive air pressure from the system, it doesn't control flow between tanks.
- D. The air dryer removes moisture from the air, it does not regulate flow between tanks.
Air System Check Valve
A one-way valve in an air brake system that allows air to flow in one direction but prevents backflow, crucial for maintaining the independence of dual air systems.
- Ensures primary and secondary systems remain separate.
- Prevents air loss from one system affecting the other.
- Typically located after the wet tank.
Memory trick: A check valve is like a VIP bouncer, one way in, no way out for air.