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If it helps, my understanding is that in normal use a fire extinguisher has a dip tube that leads down to the liquid at the bottom. The pressure drop when the valve is opened means that gas is produced from the nozzle. This suggests that fire extinguisher valves are capable of running liquid or gas.
CO2 becomes liquid around 750psi and we are required to have a burst valve if bottle pressure exceeds 1000psi which when a bottle is correctly filled should only happen in exceptional circumstances. When you open your isolation valve(s) to fill your buffer tank there is a greater volume for the CO2 to exist in which will allow some of the liquid to become gas (by volume about 50 times), each time you fire the weapon, some more of the liquid will evaporate to maintain the pressure at 750psi until it is all gas when the pressure will start to drop with each firing.
To my mind it is probably best to flow gas and not liquid through the extinguisher valve, such is the pressure drop through the extinguisher and / or the isolation valves it is likely that the buffer tank side will be just see gas anyway. So if you are using a dip tube angle the extinguisher with the valve down (like Chaos2), without a dip tube angle the extinguisher with the valve up, or use Maddox' idea and bend the tubes so you can mount it horizontally. But I don't believe it's a make or break issue as the flow of gas through these valves is slow enough that it isn't an area I have seen a problem (I bow to anyone who's experience is different).
If it helps, my understanding is that in normal use a fire extinguisher has a dip tube that leads down to the liquid at the bottom. The pressure drop when the valve is opened means that gas is produced from the nozzle. This suggests that fire extinguisher valves are capable of running liquid or gas.
CO2 becomes liquid around 750psi and we are required to have a burst valve if bottle pressure exceeds 1000psi which when a bottle is correctly filled should only happen in exceptional circumstances. When you open your isolation valve(s) to fill your buffer tank there is a greater volume for the CO2 to exist in which will allow some of the liquid to become gas (by volume about 50 times), each time you fire the weapon, some more of the liquid will evaporate to maintain the pressure at 750psi until it is all gas when the pressure will start to drop with each firing.
To my mind it is probably best to flow gas and not liquid through the extinguisher valve, such is the pressure drop through the extinguisher and / or the isolation valves it is likely that the buffer tank side will be just see gas anyway. So if you are using a dip tube angle the extinguisher with the valve down (like Chaos2), without a dip tube angle the extinguisher with the valve up, or use Maddox' idea and bend the tubes so you can mount it horizontally. But I don't believe it's a make or break issue as the flow of gas through these valves is slow enough that it isn't an area I have seen a problem (I bow to anyone who's experience is different).
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