Air-dryer leaking

Probably a line to the governor is bleeding off. I had a push-to-connect fitting cause that before.
If everything is good, ideally wouldn't purge every 20 minutes.

 

Your air system should purge every time your air system reaches 120psi. Your compressor should stop pumping at the same time. If your system is operating correctly it should be one crisp blow off. The air compressor shouldn’t start pumping again until The air system has dropped to 90 psi. The time is takes to drop to 90 psi depends on air usage and more often air leaks. Ideally the air pressure shouldn’t drop until you use you brakes or other accessory.
Without knowing how your system is set up (location of drier, compressor, governor, etc) and being able to listen for air leaks it’s hard to say what caused it to purge every 25 sec.
It sounds like your system is working correctly now.

 

Because it's old technology. You said yourself you have to take the thing apart to change the filter. ADIS has a spin on desiccant which is also less expensive. Plus you can change the purge valve in about the same time as the filter. Smaller package. Less downtime, less cost to maintain without complete replacement.

 

makes sense. Thanks