Help me identify this threadsize

[Djonah Inc.]

Hello,

I Have 2 old tanks that need new valves on them.
Well, lets just say I want them equiped with new ones

The tanks are doubles with a J-valve
brand: Faber
size: 11.6 liters



Any idea about the threadsize?

Thanks!

Greetings

 

[Scared Silly]

If you were in the USA I would say 3/4" but being in Belgium M25 x 2 comes to mind.

 

[Djonah Inc.]

M25 and M25x2 are straight threads, aren't they?
Well, as far as my eye can see, this thread is not straight...
3/4 was my first idea too...
The problem is, when I look at new 3/4 valves, the o-ring is not in a groove like the original valves resulting in the valves not being against the neck of the tank.

 

[Scared Silly]

It is not the thread that is straight but the body that the threads are cut into. That is a straight threaded valve. Here is an example:

http://www.sublub.nl/winkel/images/valve.jpg

As for the grove that is interesting as typically the grove is in the cylinder. Does your cylinder have a grove for the o-ring?

 

[Djonah Inc.]

so after a long time, I found the chance to have a look at the cylinders...no groovy grove...
would it be possible to get a grove made in the cylinder neck?

thanks!

 

[Djonah Inc.]

Hopefully this week I'll have time to give my "tank supervisor" a visit and I'll ask if if would be possible to bore a groove in the tanks (jup, I've got 2 of them (originally a D11.6 )
If it works out ok, I'll have a complete modular set (got a manifold for the new L and R valves)

Wish me luck guys!!
oh yeah, just to illustrate the situation:

 

[Djonah Inc.]

OK... the tank supervisor gave me a cold shower this morning...short answer: NOOOOO, get yourself new cylinders, or other (impossible to find) valves...

any help?

thanks guys!

 

[Leadking]

It would help if we knew under which regulatory authority these cylinders were made.

 

[Djonah Inc.]

How can I find that info?
I sent a mail to faber to get the info, but if there is a way to read it out of the inscriptions...

faber 67141 and 67142
aria 200/300 kg/cm²
11.6 liter 11 kg 1-7 4 (I)
oh and the hydro stamp is A (hydro done in Belgium)

is this helpfull?

 

[Djonah Inc.]

Found another marking between the 11kg and 1-7 4 (I):
A stamped star with RI in it...

Any thoughts?