What does a one-way check valve in an air brake system do?

A one-way check valve in an air brake system serves a crucial role in maintaining the integrity of the air supply. Specifically, it prevents air from returning to the compressor, ensuring that once air is directed into the brake system, it cannot flow backward. This is essential for maintaining consistent air pressure for the operation of the brakes.

If the air were allowed to flow backward, it could lead to a loss of brake pressure, which might impair braking efficiency and increase the risk of brake failure. The design of a one-way check valve ensures that air can only flow in the intended direction, thus contributing to the safety and reliability of the air brake system. This feature protects against potential failures or malfunctions due to backflow, making it an essential component in the overall functioning of air brakes in trucks and commercial vehicles.