leadweight
Contributor
Does anyone know the maximum recommended tank pressure for using a yoke type regulator?
Yoke Regs
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Are you asking what is the max tank pressure where a Yoke is used? (3000 psi) or assuming you had an HP tank, could you use a yoke at 3500 psi? I don't know the technical answer to the second question, however, I would expect that if it were reasonable, someone would have done it already......you suppose the use a DIN for a reason?
Craig
Craig
OP
leadweight
Contributor
I did a search of the forum and found answers from 3000 psi to 4000 psi with 3300, 3365, 3500 and 3800. However, 3365 (232 bar) seemed the only logical answer as it is possible to put a yoke adaptor in a 232 bar din valve. Is that it?
Most maunfactures have different working pressure ratings for their yokes. It depends on the materials used.
Scuba Pro produces several yokes that are rated at 3500 PSI/238 Bar. USD recommends 3000 PSI/204 BAR for all their yokes. Apex yokes vary in recommended pressures. Atomics also vary.
I have seen a couple that had a 4000 PSI/272 BAR rating but don't remember who made them. All of them were clearly marked though.
I can tell you that I have on rare occasion have pressurized a 3000 PSI yoke to 5000 PSI for short duration. Of course I was hiding like a wipped puppy while I did it.
The Dinn is the recommended connection for high pressure because of the captured o-ring and the fact it's a lot harder to knock off. (useful in close quarters where the tank may be struck. ie. caves with small passages, wrecks)
Hallmac
Scuba Pro produces several yokes that are rated at 3500 PSI/238 Bar. USD recommends 3000 PSI/204 BAR for all their yokes. Apex yokes vary in recommended pressures. Atomics also vary.
I have seen a couple that had a 4000 PSI/272 BAR rating but don't remember who made them. All of them were clearly marked though.
I can tell you that I have on rare occasion have pressurized a 3000 PSI yoke to 5000 PSI for short duration. Of course I was hiding like a wipped puppy while I did it.
The Dinn is the recommended connection for high pressure because of the captured o-ring and the fact it's a lot harder to knock off. (useful in close quarters where the tank may be struck. ie. caves with small passages, wrecks)
Hallmac
What I know for sure is that the DIN standard (EN250) is for 232 bar and Yoke regs in Europe are required to comply to the EN250 standard. They even make the manufacturers stamp the 232 bar max on the yoke.
I'm not 100% sure what the standard is outside Europe but you might try searching on CE0078 or something like that.
I'm definately not an expert in the standards. I just happened to know the answer to your question. If you want to know more about the standards then someone else could advise you better.
R..
OP
leadweight
Contributor
I have two Scubapro MK20's around here. Both are yoke and purchased in the US. Both came in boxes marked EN 250 and CE 0098.
Perhaps these standards denote all 232 bar products?
Perhaps these standards denote all 232 bar products?
As HallMac said there are many different ratings by many different models, manufacturers, and the point in time that they were manufactured. I have possessed some that are stamped with 2250, 3000, and 3500 psi. (Most/many are not stamped) There are some aluminum yokes being used on O2 tanks with over 2000 psi on them! I have known of 3000 psi yokes being used for 5000 psi service daily, (we are talking forged marine brass here), but I certainly would not advocate exceeding the manufacturer's suggestions under any circumstances.
Norm
Norm
Waterborne
Contributor
I have an older Conshelf 14 that has "4000psi service pressure" stamped on the yoke. I also have a newer Dacor that has "232 BAR" stamped on it. I guess it comes down to the manufacturers suggested limits.
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