Where is a safety or pop-off valve usually installed?

A safety or pop-off valve is typically installed in the air system where the compressor is located, which is closest to the compressor itself. This strategic placement is crucial because the valve's primary function is to release excess pressure to protect the system from over-pressurization. By placing it near the compressor, it can effectively monitor and mitigate the pressure that builds up in the compressed air system, ensuring that the pressure does not exceed safe limits.

Body components will be designed to handle specific pressure levels, and if these levels are exceeded, there can be a risk of system failure or damage. The pop-off valve helps maintain the integrity of the air system and ensures safety by preventing potentially harmful pressure from affecting downstream components.

Having it in the reservoir farthest from the compressor, in the air dryer housing, or in the fuel tank would create unnecessary risks as those locations would not allow for immediate response to pressure changes that occur right from the compressor output. By keeping the valve in close proximity to the compressor, it allows for a prompt reaction to pressure variations, ensuring stable and safe operation of the braking system.