Keep blowing DIN regulator O-ring

[Gerbs]

DIN - either it seals, or it goes wrong immediately...

What I have found with my Mares regs (knows for popping O-Rings) is that if you inspect the ring and its seating in the groove before assembly, you avoid nearly all problems.

What tends to happen is that the O-Ring is not properly seated, so it does not fill the groove which stops it sealing when tightened. It's hard to describe, but obvious when you see it. Push the O-Ring back in, and it seals.

This is about the only problem with DIN that I am aware of.

Gerbs

 

[carrielsal]

tstormdiver,
Thank you for clarifying. I have found that people have different meanings for common expressions. I have Apex XTX200's and have not had this problem.

Carrie

 

[tstormdiver]

DIN - either it seals, or it goes wrong immediately...

What I have found with my Mares regs (knows for popping O-Rings) is that if you inspect the ring and its seating in the groove before assembly, you avoid nearly all problems.

What tends to happen is that the O-Ring is not properly seated, so it does not fill the groove which stops it sealing when tightened. It's hard to describe, but obvious when you see it. Push the O-Ring back in, and it seals.

This is about the only problem with DIN that I am aware of.

Gerbs

Good idea for a better pre- dive check of the O-rings, probably should have been doing it all along.

I dove in the pool for a little bit the other night before the O-ring popped. I had pulled the cylinders out of the water to correct another problem (right post valve handle fell off). I put the handle back on & tightened them with my shears as best as I could until I could get them home & tighten it properly. I had put the cylinders back in the water & was putting them on my back when the O-ring slipped & started leaking air, but yes, when it went, it was immediate.

 

[scubafanatic]

Thanks all. So it is sounding like I may have the wrong sized O-ring that was installed by the manufacturer,.... or as was suggested, maybe a slight machining problem. Next time I'm at the LDS, I'll have them give me a couple O-rings of the slightly larger size recommended & see what happens.

....actually, I think you need a slightly SMALLER sized O-ring....you need to DOWNSIZE from a 112 to a 111 size......

 

[cool_hardware52]

....actually, I think you need a slightly SMALLER sized O-ring....you need to DOWNSIZE from a 112 to a 111 size......

Yup, that's the case.

Tobin

 

[BlueWaterDiving]

Thanks all. So it is sounding like I may have the wrong sized O-ring that was installed by the manufacturer,.... or as was suggested, maybe a slight machining problem. Next time I'm at the LDS, I'll have them give me a couple O-rings of the slightly larger size recommended & see what happens.

PM me your address and I will send you some of the right size o-rings

 

[Couv]

Tammy,

Note that Matt said 90 duro. If you have the correct size and are still experiencing the problem, then the hardness of the o-ring could be the problem.

Couv

 

[halocline]

As I said, the ones on my MK10s are definitely 112. On my handy o-ring chart cross referencing SP part numbers with standard sizes, the DIN o-ring does come up as 111. Mine fit fine, so go figure. I suspect, as Tobin says, the actual SP o-ring is a funny metric size somewhere in between 111 and 112. Either way the higher duro o-ring will work better.

If I asked for a 90 duro o-ring at my LDS they would have no idea what I was talking about.

 

[HenrikBP]

I just did a bunch of o-ring fitting and comparing, and the DIN on my MK10 has a 112 o-ring in it and it stays put when pressurized. My Apeks takes a size 111. I tried slipping a 112 in there, and it did not fit well.

Henrik

 

[Kevrumbo]

Tammy,

Note that Matt said 90 duro. If you have the correct size and are still experiencing the problem, then the hardness of the o-ring could be the problem.

Couv

I'm having the same problem with my SP Mk2 first stage with a 90 duro/O2 compatible O-ring, size 111. (Had leak around DIN/1st stage upon opening deco tank valve on the oxygen gas switch). I'm probably gonna switch back to the black nitrile size 111 and use this reg for non-hyperoxic stage bottle gases. . .