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Air brakes unloader valve.
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On these types of air compressors the unloader valve is also now known as a throttle valve.
The only people who can tell you what valve the vehicle manufacturer used based on a vin are the vehicle dealers.
When the compressor tank pressure reaches the point where the electrically powered compressor would have the motor power cut off by the pressure switch what happens on the fuel driven compressor is the motor is revved down to an idle when the tank is full.
Higher duty cycles cause conditions that affect air brake charging system performance which may require additional maintenance.
Here are some easy ways to troubleshoot.
You can have a rest and please slide to verify.
The site may feel slow and unresponsive at times.
Air valve part number references.
Remove the air governor sensing line at the governor and use regulated shop air to cycle the compressor.
Unloader valve air brake we are doing scheduled site maintenance.
Haldex product unloader valve 312013014.
This problem usually points back to the air dryer air governor sensing line or the air compressor unloader.
With that said there are other ways to determine which valve you need.
There is no application guide that tells us what air brake valves the manufacturer used on your truck or trailer.
Why does my air brake compressor cycle constantly.