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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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Old 07-16-2020, 04:37 PM   #12
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I realize this is a 10& 1/2 year old post, but.... I'm trying to find a new opd valve for my 30 lb aluminum tank and am having trouble. I went to the link above for the valve at Out of Doors Mart, and it's stamped 5.8 for the dip tube. My 30 lb tank is marked DT 6.0. I called the place to see if it was compatible but the guy said he didn't carry that and I should find one with the right size. So, does this valve actually exist? Are there 30 lb aluminum tanks that are stamped different than mine? I'm really confused.
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Old 07-17-2020, 06:04 AM   #13
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Originally Posted by WORCShopATX View Post
I realize this is a 10& 1/2 year old post, but.... I'm trying to find a new opd valve for my 30 lb aluminum tank and am having trouble. I went to the link above for the valve at Out of Doors Mart, and it's stamped 5.8 for the dip tube. My 30 lb tank is marked DT 6.0. I called the place to see if it was compatible but the guy said he didn't carry that and I should find one with the right size. So, does this valve actually exist? Are there 30 lb aluminum tanks that are stamped different than mine? I'm really confused.
Hey I'm not sure.

Did you inquire with your local propane re-certication place?

They must work with aluminum tanks all the time from warehouse tow motors, lift trucks etc.

Mine will be due for re cert in a few years so watching this thread
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Old 07-17-2020, 06:12 AM   #14
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Hey I'm not sure.

Did you inquire with your local propane re-certication place?

They must work with aluminum tanks all the time from warehouse tow motors, lift trucks etc.

Mine will be due for re cert in a few years so watching this thread
Out door mart sells 5.8". I would think 5.8" would work in place of a 6.0" but not an expert, 0.20" is less than a 1/4" (0.25")
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Old 07-18-2020, 07:41 PM   #15
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So, I’ve been talking with a guy from Emerald Isle Distribution. When I told him of my discrepancy with the 6.0 stamp and 5.8 dip tube standard part, he said he would call his buddy at Worthington tanks. I spoke with him yesterday and he said he should have a resolution by Monday. He said if I had a 5.8 dip tube, the tank would overfill slightly and I should maybe consider using a 40 # steel tank valve because it is 6.4” which would be slightly under filled and that would be safer than over filling. He also said, if your propane place fills by weight, it won’t matter, but if they fill by volume then it would get over filled. He said maybe they’ve changed the threading over the years and that’s why 5.8” is standard for 30# aluminum tanks, but he wasn’t sure. If I’d known more about tanks in general, I probably wouldn’t have even questioned it, but I didn’t want to screw something up, so I’m crossing my i’s and dotting my t’s just in case! I’ll update with more info as I get it.
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Old 07-18-2020, 08:45 PM   #16
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Threads are standard for these tanks.

I got the “shorter” tube and pay by volume. There is a small screw on the side of all of these valves (pre&post OPD) which is the “vent” for the dip tube. You “fill” until it discharges liquid. That is why a “shorter tube” will allow more liquid before it vents liquid.

Trust the Emerald guy...

BTW, should the removal of the old valve damage the aluminum threads, you can use a pipe die to fix (been there done that,,
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Old 07-19-2020, 07:38 AM   #17
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Threads are standard for these tanks.
.....
BTW, should the removal of the old valve damage the aluminum threads, you can use a pipe die to fix (been there done that,,
Thanks for this invaluable info on the threads! My original propane place said my valve was leaky and really wanted to trade my aluminum tank for a steel one. Also was real wishy-washy on changing out the valve because “it would probably strip the threads anyway”. I’m glad I didn’t just do what he said!
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Old 07-19-2020, 08:16 AM   #18
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Could you add a gauge while you're at it?

I bought some New Old Stock Worthington 30# cylinders from one of the vintage parts suppliers that have a manufacture date of 2014, so they still have a while before they need recert. I have 3 steel ones that I use on my '05 Safari. I'd like to put a guage on the OPV and looked into getting a few. Guages for 20# are plentiful and you could buy a new steel cylinder from Costco and put it on an aluminum tank, but it wouldn't be correct for a 30# cylinder. Rochester shows a part number, but I can't find a recertifying LP shop that has an account with Worthington or Rochester that can order me some. Does anyone in the forum know of a dealer that I would be able to order from?
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Old 07-19-2020, 08:41 AM   #19
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Heat the valve with a heat gun,(or hair dryer on high) it will soften the thread sealant, no thread damage.
I ratchet strapped the tank to a tree, used a standard 30lb OPD valve and always have it filled to the bleed valve, never by weight. 👍
You can never be sure what tare weight the scale is set to.

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