Reply To: Alpha vs Diablo In Line Moisture Filters

Forums Air Tanks, Pumps, Compressors, & Filters Alpha vs Diablo In Line Moisture Filters Reply To: Alpha vs Diablo In Line Moisture Filters




Joe had changed a part between time I saw one on his web site and the time I received my unit.  The large boxy piece on to the Alpha on Joes web site is now the smaller brass piece on top the unit I have.  It acts as a valve to ensure air flows from the filter to the tank and not the tank to the filter.  It also keeps all the air in the filter from exiting when the tank is disconnected.  Let’s call it the Alpha Output Valve (AOV) to cut down on typing and make sure we know which valve I’m talking about.

Mine had a small leak that was explained after I returned it to Joe for inspection.  When I was using mine, I’d connect the tank (at whatever pressure it was at) to the AOV start my compressors, then open the valve on the main tank.  That exposed the AOV’s top to whatever pressure the tank happened to be at when I decided to refill.  The bottom of the AOV would be at whatever te residual pressure was left in the Alpha.  If the pressure difference between the top of the AOV and bottom of the AOV is too high it can damage the AOV.  I was told by Joe the right way to use this is to connect the bottom of the alpha to the Shoebox, top of AOV to tank – but leave tank valve closed – then start the compressors.  When the pressure in the Alpha is roughly at or above the pressure in the tank, open the tank valve.  That way the air is always flowing from the bottom of the AOV though it and out the top.  I haven’t had any issues since I followed that process.


Not letting liquid flow down hill into the tank is a good idea to help stop drops of liquid from getting into the tank via gravity.  What you aren’t accounting for is the humidity in the air.  That is all going into the tank whether you have a vertical run up 5 feet or not.  If you want a better than nothing solution, run that line up inside something that is colder than the air around it.  This is similar to how a still works – hot steam being condensed into liquid by colder coils that are liquid cooled.  You could run the line up inside a fridge or maybe coiling it up inside a small portable cooler with ice in it.  I’m not advocating that is a good idea, just that it could be better than nothing for removing humidity.

Either way, keep an eye on your barrel (especially if it is shrouded) and look for rust specs.