Quote:
Originally Posted by martix_agent
please don't' fill a HPA tank with co2. if you find a place that will do it they are idiots to even consider it.
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It is impossible to fill a HPA tank with CO2 because the two types of bottles fill in entirely different ways.
You need to have a CO2 valve assembly installed to use a fiber wrapped tank for CO2. Since CO2 is filled through the same part of the tank as the CO2 comes out for the marker, it is a two-way valve on a CO2 tank. The CO2 goes wherever the pressure is the lowest. When they fill a CO2 tank, they screw the filler onto the bottle and open the valve and since the pressure in the fill bottle is higher, the empty CO2 bottle fills. When you screw the CO2 tank into the marker, the pressure in the marker is lower so the CO2 moves to the marker and refills it after every firing cycle.
Filling a HPA bottle is completely different because there is a regulator on the bottle. If you tried to screw the CO2 filler onto a HPA bottle and fill it, you would destroy the regulator as soon as you opened the fill valve because a HPA regulator is a one-way valve. That's why you have to use a fill nipple to fill a HPA bottle. The fill nipple entirely bypasses the regulator and goes directly to the bottle. There is no other way to fill an HPA bottle without destroying the regulator. If someone REALLY wanted to fill a HPA bottle with CO2, they would have to construct a quick disconnect line to attache to their CO2 filler line to hook it up to the fill nipple on the HPA bottle. But after all that work, the CO2 would still probably be stuck in the bottle because it would lack the pressure to make the regulator work or it would all vent out when the raw CO2 destroyed the seals in the regualator.
tank shapes
