Scubapro Mk25: To DIN or not to DIN?

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mac64

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Heading off for a dive now, lovely morning and my 7ltrs tanks slung for sidemount which I couldn’t have used with din as its a yoke only.
 

Bigbella

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Has anyone actually tested scubapro yoke valves. I could see treads on din getting damaged far quicker than a yoke. Even a small bang on a valve and you can’t get the inserts out. The force that would be needed the dislodged a pressurised yoke is going to damage any setup. I pump all my tanks to 250 bar and with yoke regs I never as much as blew an oring. As for compact and using din for side mount. When I switched to side mount I found the yoke knob a handy place to sling with the bungee to snug up the tank at times and I was able to use any tank irrespective of what valve it had. The argument for the knob sticking out is ridiculous as the tank is lower.

I have either possessed or had access to DIN tanks, since the 1980s, when they first really hit the US market, well before those combination valves with the inserts; and I've never experienced cross-threading issues with any of my regulators, in all that time; nor have I ever had issues removing an insert on a more modern valve; but have seen knobs cleaved off of yoked regulators; sundry o-ring failures, while working boats (usually, as result of piss-poor maintenance on a diver's part); and the aforementioned problems, mentioned earlier in the thread.

Sure, the level of damage, capable of damaging a yoke, would likely also affect a DIN set-up as well; but I haven't seen that, in thirty-plus years of commercial diving, in often less than ideal conditions.

Perhaps, it ultimately comes down to a matter of preference. I have always had the capacity for using either or both connectors, as needed; but feel far more secure, at 276 bar (4000 psi), using DIN . . .
 

halocline

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I do think that yoke valves are likely more durable in situations like rental fleets in the Caribbean. There are no exposed threads and the valve head is a big thick flat piece of brass. There is a reason they have worked so well for decades in places like that.

Now I see lots of convertible valves in Cozumel, which is handy for DIN users but I've already seen, just on a few trips, problems getting the inserts out. Those are exposed threads, and if the inserts are not removed regularly after salt water use, good luck!

DIN tanks are great if they are well cared for, nice clean threads, no banging around, etc. I use them all the time in cave diving, they are less of an entanglement and there are fewer annoying slow leaks from bad o-rings.

So there's a real place for each valve type IMO.
 

BoltSnap

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I have been using DIN valves and first stages since circa mid 80's for personal use without any issues except when the top of the valve was dented in a car crash which made it unusable for DIN or Yoke configurations few years ago. On the other hand, I have seen many issues with Yoke setups over the years in HP tanks with o'rings dislodging and losing air rapidly (in addition to the issues mentioned above). The yoke screw knob/wheel seems to be a favorite place for ropes and lines to wrap themselves around underwater.
 

Pressurehead

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I have been a little 'gun shy' of yoke fittings since I was hit just below the right eye by an O ring blowing out [not my cylinder or regulator]. I was just attaching my regulator near by, and mine was yoke then as well, now DIN .
I know it's rare and does not happen often.
I still have yoke for travel [Mk10 G250s], DIN at home.

20211013_113554.jpg
20211013_113816.jpg
 

eelnoraa

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This. Everything I have is DIN and has always been DIN, but the traveling and renting tanks or LOBs is a problem. I used the yoke converter for my regs for years, but was always annoyed by how long it made the first and how easy it was to hit your head on it. Eventually I bought the yoke bits and just flipped it back and forth for trips. That alleviates the long adapter problem, but still gets old after a few years. I eventually broke down and bought a separate reg for vacation/singles diving that just stays yoke.
Exactly my experience. I have separat set for travel/single( yoke) and local/ double(din)

If I were to start over, my single setup will be yoke. The pressure rating is a mood point for recreational. I have used see yoke on 3442psi tank all the time lower profile is also not an issue for rec. din with yoke adapter are a bigger hassle.
 

eelnoraa

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View attachment 678117
Not all detachable yokes are created alike; some are better and more compact than others

DIN, dammit, DIN, heh, heh, heh . . .
1st stage is easily 1” closer to your head. Picures I snap 13 years ago.

native din.

Same reg with one of the lowest profile converter, same tank with yoke insert remove.

I don’t have an native yoke mk25. I only have native yoke AA. If anyone interested I can go snap a picture. But without doing that, I am positively sure it will be compatible to native din measurement.



Btw, the convertible valve which let you remove the yoke insert and become din, those are all 200bar din. We all use it with 3442 hp100, which is 235bar fill. For typical tank pressure, I think we can leave the pressure rating thing out of the discussion
 
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