Din tank valve blows Orings

[alrazi]

Hi
A first timer here ..
I have 2 new Al80 tanks with DIN valve connectors. one of them blows O-rings 10 minutes after I connect my regulator and for safety reasons I can't dive with it.
My dive operator fills it up to 3500psi (245 bars) although it is rated for 3000psi (207bars). Could this be the reason it blows Orings? My other similar tank doesn't do that! The orings are a snag fit and they are from Scobapro dealer, so I'm sure they are to the spec.. Any similar experience? Please help.

Al

 

[SparticleBrane]

Hi
A first timer here ..
I have 2 new Al80 tanks with DIN valve connectors. one of them blows O-rings 10 minutes after I connect my regulator and for safety reasons I can't dive with it.
My dive operator fills it up to 3500psi (245 bars) although it is rated for 3000psi (207bars). Could this be the reason it blows Orings? My other similar tank doesn't do that! The orings are a snag fit and they are from Scobapro dealer, so I'm sure they are to the spec.. Any similar experience? Please help.

Al

The "valves" aren't rated to 3000psi. The burst discs in the valves are "for 3000psi cylinders" and blow at 5000psi. This isn't the issue.

 

[WD8CDH]

DIN regulator or yoke regulator with yoke/Din insert in the valve?

 

[sphillips3]

Assuming you are putting a DIN regulator into a DIN valve (as opposed to a yoke regulator on a DIN/K valve with insert....

1) Make sure that you are in fact screwing the reg all the way into the fitting. If there is any thread damage on either the reg or the valve you may not be bottoming out. A DIN connection is a hard metal to metal connection with the o-ring captured between the reg and the bottom of the valve port.

2) Make sure that the DIN fitting on the reg is properly assembled. You would be amazed how many folks don't know how to install the DIN adapter on a regulator. Get a qualifed, knowledgeable, experienced tech to take a look.

3) Be sure you are using the correct o-ring. ScubaPro regs use a special hard o-ring on their DIN regs (it's white in color). Again, a knowledgable tech will know what part to use.

 

[mkutyna]

You might want to answer the questions people posed to you in the other thread that you created about this same problem yesterday.

http://www.scubaboard.com/forums/regulators/283597-tank-valve-blows-o-rings.html

 

[alrazi]

Hi everyone,
Please excuse my ignorance but it looks like I've made a big mistake here because I am confused. My connector is a YOKE type and not DIN as I've previously indicated. Picture attached.
But I'm truly overwhelmed by the amount of response and information I've received just for posting this problem. You guys are amazing .. a truly genuine forum. keep it up.
Now back to my problem, would someone explain to me what I'm doing wrong with my YOKE connection tank? is it over filling that is causing the o-ring problem?
Thanks,

 

[JBRES1]

Have you checked area that the o-ring goes into to see if it is deformed ?

Is the reg sitting flat on the tank valve ?

I had a problem a few years back with o-rings blowing, and found that the reg was the problem and not the tank valve. In my case the part of the reg that contacts the o-ring had a small dent in it that allowed the o-ring to extrude out.

Jim Breslin

 

[oxyhacker]

Highly unlikely. Overfilling will slightly increase the chance of failure, but not make it inevitable, as it seems to be in your case.

You are aware, I hope, that there are 2 different sizes of O-rings commonly used on yoke valves, a 3/16" thick #112 , usually referred to as "thick" and a 1/8" thick #014 , usually referred to as "thin", and that using the wrong one causes problems?

And then, occasionally you will find a valve or a reg that is just a bit out of spec, and won't seal reliably, or one valve and one reg that just won't seal reliably with each other.

Now back to my problem, would someone explain to me what I'm doing wrong with my YOKE connection tank? is it over filling that is causing the o-ring problem?
Thanks,

 

[captain]

Highly unlikely. Overfilling will slightly increase the chance of failure, but not make it inevitable, as it seems to be in your case.

You are aware, I hope, that there are 2 different sizes of O-rings commonly used on yoke valves, a 3/16" thick #112 , usually referred to as "thick" and a 1/8" thick #014 , usually referred to as "thin", and that using the wrong one causes problems?

And then, occasionally you will find a valve or a reg that is just a bit out of spec, and won't seal reliably, or one valve and one reg that just won't seal reliably with each other.

Vance, the #112 is 3/32" cross section not 3/16"and the #014 is 1/16" cross section not 1/8"

 

[Cave Diver]

Hi everyone,
Please excuse my ignorance but it looks like I've made a big mistake here because I am confused. My connector is a YOKE type and not DIN as I've previously indicated. Picture attached.
But I'm truly overwhelmed by the amount of response and information I've received just for posting this problem. You guys are amazing .. a truly genuine forum. keep it up.
Now back to my problem, would someone explain to me what I'm doing wrong with my YOKE connection tank? is it over filling that is causing the o-ring problem?
Thanks,

The first thing that I would try would be putting your reg on another tank and putting another reg on your tank.

This will tell you if the problem is with your tank, your reg, or some weird combination that only occurs between the two.