12321 Supply dump valve

Purpose The supply dump valve has been designed to meet one of the EEC Brake Safety Directive for Trailers, which requires that if there is an imbalance of air pressure between the tractor service line and the trailer service line due to leakage or decoupling, then within two seconds of the next full service brake application the compressed air in the trailer supply (emergency) line will be dumped to the atmosphere, reducing the pressure to 1.5 bar. The result of the service line pressure collapse signals the trailer emergency valve to transfer compressed air stored in the trailer reservoir to the trailer brake actuators, so causing the brakes to be applied.

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