The semi-trailer brake valve serves as the core control component for tractor and semi-trailer braking systems. It is specially designed for trailers equipped with dual-line air brake systems, where both parking brake and emergency brake rely on air pressure drive.
A key safety feature is its automatic braking trigger function: if the control pipeline of the trailer brake system becomes disconnected or suffers air leakage, the valve will immediately activate the trailer brake to avoid traffic risks during heavy-load transportation.