Getting mixed answers on Din connections? Thread depth

[JMarc]

I once had a tank fill refused with a 300 bar valve on 232 bar tank.

Consider what would happen if the 300-bar tank you want to fill is in fact already filled to 300 bar. You'd feed back 300 bar to an installation not designed for that, not sure I'd like to be around.

 

[happy-diver]

Like blowing out the candles on a birthday cake?

 

[jborg]

There is some goofy European standard where those won't work, but here in the US 300 BAR DIN regulators works on 200 BAR DIN valves.

All 300 bar regulators work on 200 bar valves, regardless of region. What doesn't work over here is a 300 bar fill whip into a 200 bar valve.

(Maybe you're thinking of the really goofy M26 standard for oxygen. Nobody uses that, except maybe French rebreather divers or something.)

 

[rhwestfall]

I once had a tank fill refused with a 300 bar valve on 232 bar tank.

3 minutes or less in the parking lot with a sharpie... Problem solved...

 

[iain/hsm]

A DV = demand valve = regulator.

Separated by a common language.

A DV is the Demand Valve. And is the second stage. The bit with the rubber tit you bite on and suck with.

A Regulator = The Pressure Reducing Regulator. And is the first stage the btt that reduces the pressure from cylinder pressure to around 6 to 10 bar over the surrounding ambient water pressure.

The demand valve supplies air on demand hence it's name while the regulator reduces and regulates the cylinder pressure to the pre set pressure hence it's name being the pressure reducing regulator

They're fixed it for you. Don't you just love scuba instructors ROFL

 

[iain/hsm]

This is confusing. He doesn't mean DV, he means regulator.

Only it would appear to those scuba instructors among us LOL

 

[TravisD]

Consider what would happen if the 300-bar tank you want to fill is in fact already filled to 300 bar. You'd feed back 300 bar to an installation not designed for that, not sure I'd like to be around.

First, if a 232bar cylinder has been filled to 300 bar - that's where the problem is. I guess in places where fill whips are designated for 300 vs 232 bar, that's the main 'risk' here of having a 232 cylinder with a 300 valve?

Fill stations usually have regulators - if I hook up a cylinder to my fill station and the regulator is set for a pressure below what the cylinder has in it, it does it's job and releases pressure until it's at the setting of the regulator.

 

[Agro]

First, if a 232bar cylinder has been filled to 300 bar - that's where the problem is. I guess in places where fill whips are designated for 300 vs 232 bar, that's the main 'risk' here of having a 232 cylinder with a 300 valve?

Fill stations usually have regulators - if I hook up a cylinder to my fill station and the regulator is set for a pressure below what the cylinder has in it, it does it's job and releases pressure until it's at the setting of the regulator.

Never ever heard about such a regulator.

 

[Agro]

All 300 bar regulators work on 200 bar valves, regardless of region. What doesn't work over here is a 300 bar fill whip into a 200 bar valve.

(Maybe you're thinking of the really goofy M26 standard for oxygen. Nobody uses that, except maybe French rebreather divers or something.)

Yes, all 300 bar regulators work on 200 or 300 bar valves.
200 bar regulators do not work on 300 bar valves. Today 200 bar regulators hardly exist anymore, most are 300.
A 200 bar fill whip works on 200 and 300 bar valves.
A 300 bar fill whip only works on 300 bar valves.

If you have a 300 bar valve on a 200 bar cylinder somebody made a big, big mistake. This will bring 300 bar into a 200 bar cylinder, crashboombang.

Yes, there is a stupid M26x2 standard. Germans invented this thread, fortunately hardly anybody uses it on this planet. Exept some German divers. Some German fill station even ask for a M26x2 for nitrox, otherwise you get no fill. Stupid.

 

[jborg]

Never ever heard about such a regulator.

If you have 300 and 232 or 200 bar outlets from a compressor, you'll have one of these regulators for the 232/200 side. Often adjustable so you can set it to for example 232+10% for such a fill, or turn it down for a 200 bar fill.