What helium-valve is this?

[ahereng]

Hi,
I just got hold of two partly used helium-tanks, but I don't know what valve these use for connecting to my booster.
It's not our normal inertgas-valve, it may be some kind of Uk/Us/Eur valve. It's diameter is larger than Din5/8.

Does anybody recognize these?

Alexander

 

[Gone for diving]

I think it is a CGA-580 Nut & 3" Nipple, normal in north America...

But without measurements not sure...

CGA-580 Nut & 3" Nipple, Regulator Inlet Bottle Fittings (Helium Argon Nitrogen): Amazon.ca: Tools & Home Improvement

 

[ahereng]

Thanks. The diameter seems to be 7/8inch / 22,1mm, and depth 13/16inch / 17,5mm. Looks conical in the base.

 

[rjack321]

With the burst disk on the back side that looks like a North American CGA-580 to me. That is the correct valve for inert gases including helium here.

The valve
Nitrogen | Argon | Helium Valve - CGA580 - 3/4" NGT - Sherwood | Gas Cylinder Source

The dimensions of the connection (scroll down to 580 but in case that isnt it maybe another one matches)
CONCOA CGA Connection Reference Chart

It should be a 15/16" outlet hole. The conical base is correct.

 

[ahereng]

Thanks guys, then I know what parts to order.