LVS Wabco air dryer trouble shooting

[tcody]

I need some trouble shooting help for a MK48 air dryer. The LVS is having trouble airing up. During the loading cycle the purge valve is dumping air making getting the pressure up hard. It looks like a Wabco super saver twin model. Is it likely just a problem with the purge valve or could it be something up stream. Anyone got the part numbers for the drier, the purge valve and the dessicant canisters.
Regards
Cody

 

[73m819]

Sounds like dirt in the valve or a broke closer spring, because the valve is ONLY designed to open AFTER full operating pressure is reached

 

[tcody]

Ron - thanks. I think I will take apart the valve tomorrow and clean it/check the spring and see what happens.
Regards,
Cody