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When you say control line are you referring to the line connected to the purge port on the dryer? You have a large airline in from the compressor, you have a large airline out to the wet tank and you have a small line in from the governor. When the governor sees its set pressure in the tank...

Unless of course they are the knuckleheads(or knuckledragers) who broke it in the first place:)

Assuming there is some sort of spring that holds the purge valve closed? Is it intact? That metal may have come from a spring coil? Failing that, the wire may have scratched/damaged a surface or the o-ring that it should seal against. As long as you are sure there is no air leaking down the...

Or something else in the system broke down and provided crap. Took apart an old style dryer last week that was full of brass shavings from input port down to the filter. The filter/media should however keep that from getting to the purge valve. If it is a stuck purge valve, Maybe you got a...

There should be 3 lines attached to the dryer. Main airline in from the compressor, dry air out to the wet tank and a third small airline should connect near the purge port/cover. that line runs up to the governor. On the old style units it is a 1/4” line and it connects right up into the...

What happens when you disconnect the purge airline off of the bottom of the dryer? When the governor reaches pressure and unloads, it sends system/sense pressure down that line to open the dryer purge valve so it can back-flush the coalescing media with air stored inside the dryer housing. If...