This valve ensures that the air pressure in the system does not exceed the maximum set limit (e.g. 8–10 bar). Excessive pressure can damage components such as the air compressor, brake cylinder, and hoses.
It maintains air pressure at a stable level so that the braking force transmitted to the wheels is consistent. This is very important for safe driving, especially in heavy vehicles. When sufficient pressure has been achieved, this valve helps prevent the compressor from working excessively. This reduces fuel consumption (for vehicles with diesel engines) and prevents the compressor from wearing out quickly.

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