Vintage Double Hose

I'm new to the Vintage arena, and have done some DIY with other equipment. I have a US Divers J valve that apparently has an older Overpressure relief plug. According to the schematic, it appears to be an pre 1966 valve plug and is Large. Much bigger than the 3/8th standard. Is this 1/2 inch? It measures like 9/16 at the threads. Also, any tips on getting out the brass/copper washer? It appears stuck or corroded. I didn't want to pry too much on it for fear of damaging it,
Thanks for any help. I've enjoyed and learned a lot from this forum.

I can't speak to the valve you have. But, I do have A couple of later model j-valves that I got parts for from Bryan. I would be willing to send you one for the price of shipping if your interested.
Ed

It looks like a 1/2" burst disc. I use a dental pick to get the copper burst disc out. I think Bryan sells these in the store.

It is probably not a brass or copper washer, it is most likely a phenolic gasket. You probably will not get it out in one piece as they stick to the valve and become brittle with age. Use a pick to break it up. You can replace it with a nylon one or leave it alone and put the nylon on top of it.

Thanks to all for the information. I'll try the 1/2 in. plug from Brian. The gasket looks good so I'll leave that alone for now.

If you are going to leave the old gasket in place I highly recommend you put a new nylon one on top of it because if it leaks with just the old one you will have to empty the tank to replace it.

Hmm, well, the 1/2 inch is too small. Measures more like 5/8th. I've never seen one this big on a US Divers J Valve? The nut has multiple ports and the disc appears copper and is concave. Another PIC attached. Not sure if I can find a source for a replacement disc and reuse the nut. Oh, well. should of checked this first before cleaning up the valve. A good learning experience though. Thanks for all the input.

What do the rest of the valve guts look like? I have never seen a USD with a burst disc this large. It can't be a European one, because they don't have burst discs. Can you take pictures of what the rest of this thing looks like?

US Divers did have a large burst disc for a while. The bad news is that there are no replacements available, as far as I know. Others in the past have searched dive shops, industrial gas supply companies, etc. with no luck.

I would just look for a different valve. It is easy to replace the valve. Even if you did find some NOS disc from some old dive shop, the supply would be limited.

Good luck

pasadenatim wrote:Hmm, well, the 1/2 inch is too small. Measures more like 5/8th. I've never seen one this big on a US Divers J Valve? The nut has multiple ports and the disc appears copper and is concave. Another PIC attached. Not sure if I can find a source for a replacement disc and reuse the nut. Oh, well. should of checked this first before cleaning up the valve. A good learning experience though. Thanks for all the input.

Can you make an accurate measurement of the disc diameter? Thickness would be helpful too. I will be glad to look around for something that fits. Sounds larger than anything I recall, but it's worth a try looking.

I would suggest you try at a commercial gas supplier such as Airgas, Air Liquide or Praxair. Some of the commercial gas cylinders use a large burst disc.

Does your burst disc assembly look like the one on the left? The right one is the standard 3/8".






If it is contact me at [email protected]

Allan

I might have one used on surviv air USD

Yes I have those burst plugs contact me,USDivers used them on the1r Survivair firefighting line also!

Thanks for the help Jerry MOOOOOOO!