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.