Tank Valve Service Pressure

[Scared Silly]

I'm aware. I have one LP twinset with a 300 bar manifold, as it happens. I was talking about the pressure rating of the manifold itself.

It has nothing to do with pressure rating of the manifold/valve either. It do with the pressure rating of the regulator.

The mechanical connection, i.e. the threads occurs with the first couple of threads. The fact that there are five threads is sufficient for 300 bar.

One could put a 300 bar regulator on a 200 bar valve and run 300 bar pressure without issue.

There are seven threads on a 300 bar valve so prevent a connection/seal with a 200 bar regulator.

 

[MarkA]

It has nothing to do with pressure rating of the manifold/valve either. It do with the pressure rating of the regulator.

The mechanical connection, i.e. the threads occurs with the first couple of threads. The fact that there are five threads is sufficient for 300 bar.

One could put a 300 bar regulator on a 200 bar valve and run 300 bar pressure without issue.

There are seven threads on a 300 bar valve so prevent a connection/seal with a 200 bar regulator.

My first din regulator was a Cyklon 300. It had 5 threads. Any guesses on its rated pressure?

There are also differences in the charging leads where a 300 bar (7 thread) will not seal on a 5 thread valve. the end nipple is long and thin.

 

[CG43]

One could put a 300 bar regulator on a 200 bar valve and run 300 bar pressure without issue.

Count the number of turns you can screw a 300 bar regulator into a 200 bar valve.
It is slightly less or slightly more than 3 turns.
If the threads are good, this is sufficient for 200 bar. Whether this also provides enough reserve for 300 bar, for example if additional forces are applied to the regulator, is at least not part of the DIN/ISO standard, as there is no 300 bar from a 200 bar valve. Here, a pin in the filling connection prevents filling the 200 bar valve with 300 bar. This is also the reason why burst discs are not necessary.
Omitting the pin replaces a planned safety system with something insufficient that cannot be compensated by unreliable burst discs.

 

[Tim Clark Diving]

Here, a pin in the filling connection prevents filling the 200 bar valve with 300 bar. This is also the reason why burst discs are not necessary.

Can you explain this a little more? I’m not familiar with a pin in the filling connector. Is that something in the EU that we don’t have in the US?

 

[Tanks A Lot]

Can you explain this a little more? I’m not familiar with a pin in the filling connector. Is that something in the EU that we don’t have in the US?

Yes, it seems like the U.S. has not adopted the connector interlock features that would prevent mismatches. Specifically, there is nothing preventing you from filling a 232 bar cylinder from a 300 bar charging whip. This can't happen in Europe, that is what the thread count and nipple length is meant to do; quite a clever setup I believe.

See this discussion.

 

[happy-diver]

And this is why you machine the thing off and reduce that thick thing to 7mm to engage more threads

And you will need decent air power to dislodge your burst disc but also leave the plug in, just loosen it

And with no air power with the copper disc firmly wedged in the threads pierce the thing in the middle

 

[CG43]

And this is why you machine the thing off and reduce that thick thing to 7mm to engage more threads

Well, you can do it that way, and I also have no concerns if happy diver does it that way for themselves.
But it has to be clear that you can then fill 300 bar into a 200 bar valve.
And if you then screw a 300 bar regulator into the short 200 bar connection, you should count the number of threads.
The worst combination I have is a Sherwood DIN with a CE 0474 200 bar valve.
This combination then only has 2.6 turns, a value that I personally would not accept at 300 bar.
However, this DIN/ISO 0474 valve only has a 14 mm deep connection, whereas all my other 200 bar valves have a depth of 15 mm, as specified by DIN/ISO 288.
At least 4 turns should always be present.