Question about SCBA valves

Forums Air Tanks, Pumps, Compressors, & Filters Question about SCBA valves

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    Centercut
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    Concur with @jking, which is why I asked. If it only goes to 3000 or slightly above it’s a CGA 346 connection and won’t work with your fill rig. 

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    Eaglebeak
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    A CGA 347 fill adaptor will fit both 346 and 347 valves. A CGA 346 will only fit 346 valves. If you over tighten it you will crush the Oring and cause it to leak. Put a new Oring in it and only tighten it until you feel it start to squash, no more. You will not find an adaptor to fit that type of valve that doesn't use an Oring or Delrin type washer. The only other type fill adaptors are DIN 200 and 300. Both use Orings, and both won't fit your valve.

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    porkey
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    It definitely is a 4500 psi tank, I was thinking maybe someone changed the valve so i tried a cga346 adapter……the 346 fit the tank but would not tighten up because the nipple is shorter

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    porkey
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    Hi JK…….I have the exact same Scott valve in the picture at the top of the page…..

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    porkey
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    Hi Centercut and everybody on the forum……I found the answere to my leaking cga347 adapter. I took the tank and adapter to the guy in the dive shop and he immediately said the rubber o-ring is the problem……they always LEAK…..He said Scott valves all have the vent holes drilled threw the threads which prevents you from using the o-ring…….some time you can use the Delrin washer but they also have some problems. He suggested go online to the welding supply shop and get a solid brass or stainless Steel…….I found one on eBay…..item number 252 857 847 079. I ordered one I’ll post a update in a few day when it arrives…….. Thanks again for the help and sharing your knowledge …..Porkey

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    LTU-013
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    Porkey, I have exactly same Chinese fill adapter, had same problem – it was leaking at higher pressure 

    Removed adapter, rotated 90 or 180 degrees, don't remember exactly how it was before 

    Tightened and now it is not leaking

    I guess they use not the best material for that o-ring

    Anyone knows sourse for replacement o-ring??

     

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    porkey
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    Hi LTU 013……I measured the original,it’s metric and could not find any metrics but I found the fraction size…….7/16×1/4×3/32…..#78 o-ring…..made by Danco Inc. Boothwyn pa. 19061……..I found them at a local hardware store, Ace Hardware, Cleveland Ohio……My guy in the dive shop who fills the tank knew exactly what my problem was …….He showed me his fill adapter from his compressor, it had a delrin washer on the end of the nipple, I could see that his was also chewed up from the sharp edges from the Scott valve vent holes……..He also said he doesn’t know of any purpose for those vent holes…….Maybe that valve is designed for the solid nipple only?? I also disassembled my fill valve…..It had red locktite on it but it came apart easy, I measured the thread and to my surprise it’s npt 1/4……Porkey

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    porkey
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    porkey
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    tscktran
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    Few $ more go for this one:

    Stikman SCBA Hand Tight Fill Adapter

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    LTU-013
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    Yes, when it started leaking and I removed adapter, I realized those Scott holes already damaged o-ring a bit

    I rotated adapter and it sealed again, but I guess it's just matter of time it will leak again.

    Thanks Porkey, I like that brass nipple idea, please let us know if it works or not.

    Tscktran, if you'll read description – it says anodized aluminum, and it also has o-ring. 

    Not sure if it's good for such a high pressure

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    tscktran
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    Hey LTU, thanks for pointed out the description, but the AirtankPlus has been around for a long while, and the products are well made and supported.

    I ordered one and find out soon it get here.  : )

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    LTU-013
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    Yes, those Stickman adapters are pretty good but not cheap.

    My friend has one for almost 2 years. Didn't have any problems so far, no leaks everything is working. I was using his tank last weekend, I don't know what is inside of original fill adapter – it is aluminum or stainless steel. 

    On the other hand, I got Chinese one – made from stainless steel, built like a tank… started leaking after one week of use.

    Please share your experience, when you will get one.

    I will have to replace mine pretty soon.

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    porkey
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    Hi Centercut and everyone……Update on the cga347 leaking o-ring……I replaced the original nipple/o-ring with the solid brass nipple and the problem is fixed….no more leak..no more o-ring……Thanks again to everyone who helped and shared your knowledge….Porkey

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    Centercut
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    @porkey, thanks for staying on top of the problem and letting us know the resolution…

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    tscktran
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    Porkey, Thank you for the update.

    I got the Stickman fitting and it working fine, I like the idea without the O-ring though.

     

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    LTU-013
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    Porkey, Thanks again.

    I was about to ask you about updates, it started leaking yesterday.

    Ordered same brass part from ebay.

    Good to know it works

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    tscktran
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    Stickman

    CGA 347 No O-ring

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    LTU-013
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    I got brass one from ebay Porkey found, no o-ring

    Installed today, so far so good, no leaks

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