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There is no adjustment for the purge valve it is simply a sliding core that receives air from the governor to activate and purge the dryer cannister. It could be that ithas some crap init and is stuck... I did a utube video on overhauling the dryer media but did not really cover that valve...

Ok, maybe some clarification is in order. There are 2 valves on the air dryer. One is a safety relief valve. On the original dryers it is on the top(i‘m pointing at it in the pic), not sure where it is on the Haldex units. Like a popit type safety on any air compressor, under normal...

Well thats a cool one, 2 valves failing the same way at the same time Is pretty rare... if those are not flowing, they are only part of your problem Though and dont explain the other symptoms. Like what is causing the overpressure at the dryer, and what is leaking away the air downstream Of...

the primary and secondary tank see wet tank pressure simultaneously, so it would have to be 2 failed valves, or one system would be reaching a greater pressure than the other. Also If the inlet to the primary and secondary tank were the problem that means the wet tank would Still be receiving...

The unloader senses wet tank pressure. If there is a blockage between the dryer and wet tank, the dryer would see High pressure/overpressure And vent thru that safety release, but the unloader would only see the reduced pressure at the wet tank and keep the compressor engaged. Some air is...