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Gas pressure regulator question.

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DTJ:
It seems Amyk was right - there  may have been crap inside the reg from manufacture.

I was planning to return it to the shop today.

 Before doing that I cranked the pressure right up and flushed a heap of gas through. The regulator has an over pressure valve with a pull ring on it. I unscrewed that and let the gas flush it out. After this it seems to work OK.

I did a pile of welding today (0.6mm MIG wire + CO2)  and the Sodastream bottle is still almost full so I'm pleased with the outcome.

 :-+

lwatts666:
If the Sodastream bottle is not upright, liquid CO2 may be getting to the regulator needle valve and flashing into solid CO2 on the low pressure side. When the solenoid valve closes, the solid CO2 continues to evaporate, increasing the pressure.

Large flow rate CO2 regulators often use electric heaters to prevent this effect.

DTJ:
Thanks lwatts666, I was not aware that that was an issue (I had not thought about it).

I've got the bottle vertical and am drawing off slowly so hopefully it wont happen. It's working well at the moment. I'm surprised how little gas I'm using.

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