I bought a 12ltr bottle to keep at home and a 3ltr bottle use at range, if I’m looking to top up the 3ltr from the 12ltr do I need a one way flow valve so air goes from 12 to 3, then open the 3 and open the 12 as if I was filing a gun?
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the Daily hi thread
Filling a 3ltr bottle from a 12ltr bottle
- Thread starter Justin44
- Start date
Randomone
Member Extraordinaire
Has anyone tried one of these for decanting air from one bottle to another?
www.bestfittings.co.uk
DIN Hand Wheel to Quick Coupler Plug – Best Fittings
www.bestfittings.co.uk
Siraff
Member
If its a direct bottle to bottle they will just equalise pressure when the valves are opened. If the large bottle is always holding more pressure than the small one you shouldn't need a one way valve.
I should stress I'm not an expert on this though so please hold fire until someone can confirm.
I connect the two hoses together
Open up the small bottle valve
Open up the larger bottle and watch until the smaller bottle gets to the pressure I want it to get to. Then I close off the larger bottle and close off the smaller bottle. Release the pressure at one end and disconnect everything and it's done
Open up the small bottle valve
Open up the larger bottle and watch until the smaller bottle gets to the pressure I want it to get to. Then I close off the larger bottle and close off the smaller bottle. Release the pressure at one end and disconnect everything and it's done
TJCXF
Active member
That is exactly what will happen. This was an issue when people used to top up lpg cars from propane cylinders, but as that was a liquified gas it could be pumped, not something I ever tried. Topping up a smaller cylinder is something I've done, as usual with anything high pressure, be careful and only use good quality connections and lines.