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Old 12-24-2009, 07:30 PM   #1
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Special valve for aluminum tanks????

Am I to understand that the factory 40lb. aluminum tanks that came with my recently purchased 1976 Airstream , which, I'm told, need new valves to be legal,and have not been used for many years, need a special valve made for aluminum tanks? If so, which valve do I need for the aluminum tank as opposed to the steel ?

Thanks

Mike
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Old 12-24-2009, 07:38 PM   #2
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This valve should work:
OPD Valve (DT 7.0")
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Old 12-24-2009, 08:31 PM   #3
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I had 3 70s aluminum tanks revalved. Nobody ever said anything about a "special" valve for aluminum tanks.
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Old 12-24-2009, 11:01 PM   #4
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the 7" dip tube length at the link above says it is for 40# aluminum tanks as per the OP. Many Airstream tanks are 30# - I didn't see one at that source that said it was for 30# aluminum tanks.

There should be a DT value stamped on the tank collar to help you make sure you get the right one. The problem is that aluminum tanks are shaped a bit differently so the 80% full level, which is where the dip tube shuts off when filling, is different between aluminum and steel tanks of the same capacity.

When the OPD valves were mandated a few years ago, a number of Airstream owners had some problems because propane companies just used the steel tank DT and it wasn't the right one for their aluminum tanks.
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Old 12-25-2009, 09:47 AM   #5
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Thanks bryanl

All this time I was thinking it was for some kind of dissimilar metal reason. I had no idea the aluminum tanks were shaped differently, and that was the reason for the concern.

Many Thanks..

Mike
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Old 12-25-2009, 09:52 AM   #6
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When I switched from steel tanks to Aluminum, the new tanks were taller then the originals.
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Old 12-27-2009, 12:02 PM   #7
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Have begun the task of polishing the tanks and will replace the valves just before I have them filled. Might wait to apply a clearcoat as a last step.. Any thoughts???

Mike
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Old 12-28-2009, 04:33 PM   #8
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Have inspected the markings on my tanks and can't seem to decipher what I'm reading as to replacement OPD valve size.

They are marked as follows: Worthington DOT 4E240
0002178D WWII WC 71.1 TW16.5 BAZ

The above is all the tank markings that appear.
There are however two (I assume inspection date) markings.

What figure am I looking for??

Mike
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Old 12-28-2009, 07:08 PM   #9
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Special valve for aluminum tanks????

Greetings Mike!

Quote:
Originally Posted by Joebanjo View Post
Have begun the task of polishing the tanks and will replace the valves just before I have them filled. Might wait to apply a clearcoat as a last step.. Any thoughts???

Mike
I followed the advice the Ruths at P & S Trailer Service in Helena, OH. They polished my 40 pound LP tanks when the polished and Plasticoated my Overlander. The Ruths advised agains Plasticoating the tanks as it would be almost impossible to insure against the occassional abrasion when refilling the tanks -- an abrasion would invite the gradual failure and clouding of the Plasticoat. It has now been over seven years and the tanks continue to look nice with just a little hand polishing at the beginning of each season.

Good luck with your project!

Kevin
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Old 12-28-2009, 07:30 PM   #10
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Maybe this will help you:

Overfill Protection Device (OPD)

30 lb OPD Valve for Aluminum bottles PV3004A [PV3004A] - $28.95 : ODMRV , Out-of-Doors Mart
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Old 12-29-2009, 07:57 AM   #11
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The collar on my 30# tanks is marked "DT 6" which makes sense as it is an inch shorter than the 40# tank dip tube noted above. That marking is in a list with tare weight and some other specs. If it weren't so cold outside right now, I'd go take a picture for ya'

Thanks for the ODMRV link, that's a good source for Airstream parts. If you aren't sure what size tank you have, it takes 10 gallons to fill a 40# and 7 gallons for a 30#
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