Proper way to Flow Control O2 in Transfill

[InWay2Deep]

Currently I'm trans-filling 2L and AL40 O2 bottles from a H bottle and then topping up with a booster. What is the 'correct' way to slowly fill the 2L? Right now I'm using the valve on the 2L bottle to slow down the initial fill, H bottle wide open, slowly crack the 2L and wait to equalize then open fully and turn on the booster. Should I use something else in-line to slow the flow? I don't want to blow up.

Thanks!

 

[jborg]

Needle valve in the transfill whip is typical.

 

[Wookie]

You can throttle with the valve from the O2 cylinder or using a needle valve to control flow. Do not use the valve on the scuba cylinder. Scuba cylinder valves are not really oxygen compatible and if there is any contaminant in the whip that could cause adiabatic heating the teflon in the disc can burn and ruin your day.

 

[InWay2Deep]

Needle valve in the transfill whip is typical.

Something like this?

Brass Screwed-Bonnet Needle Valve, 1/4 in. MNPT x 1/4 in. FNPT | Screwed-Bonnet Needle Valves, JN and JB Series | Needle and Metering Valves | Valves | All Products | Swagelok

products.swagelok.com

 

[InWay2Deep]

You can throttle with the valve from the O2 cylinder or using a needle valve to control flow. Do not use the valve on the scuba cylinder. Scuba cylinder valves are not really oxygen compatible and if there is any contaminant in the whip that could cause adiabatic heating the teflon in the disc can burn and ruin your day.

Yea, that could be an option, the o2 tank is a little far away for me to really dial in the flow rate, but good to know that's an OK option until I get something better in place. Thanks

 

[Russjstewart]

Something like this?

Brass Screwed-Bonnet Needle Valve, 1/4 in. MNPT x 1/4 in. FNPT | Screwed-Bonnet Needle Valves, JN and JB Series | Needle and Metering Valves | Valves | All Products | Swagelok

products.swagelok.com

Did you read the fine print?
Features: Working pressures up to 600 psig (41.3 bar); Temperatures up to 300°F (148°C); Straight and angle patterns; Vee stem standard;

What is the pressure in your H cylinder?

 

[InWay2Deep]

Did you read the fine print?
Features: Working pressures up to 600 psig (41.3 bar); Temperatures up to 300°F (148°C); Straight and angle patterns; Vee stem standard;

What is the pressure in your H cylinder?

doh, no I did not. When full H is ~2400 psi. Any recommendations on Needle Valves?

 

[jborg]

Something like this?

Brass Screwed-Bonnet Needle Valve, 1/4 in. MNPT x 1/4 in. FNPT | Screwed-Bonnet Needle Valves, JN and JB Series | Needle and Metering Valves | Valves | All Products | Swagelok

products.swagelok.com

More something like this, though it may be more bells and whistles than you strictly need:

Decanting Assembly High End Digital

Decanting Assembly High End Digital

www.deepstop.de

 

[Asheron]

Orifice, bought the equipment from an old dive shop and the owner gave ma an orifice. It works good.

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[happy-diver]

Well last week during the transfilling thread I made a video of moving o2 from a higher pressure E
to a lower pressure G through a booster then pushing the pressure in the G higher for ten minutes
or so, I think two cylinders of drive gas and timed it but I don't know where I put it in my computer

But the drive gas got cold and the booster stayed cool but the out line was warm, E got cold G cool

Not a needle valve in sight

Just nimble fingers

And lots of adaptors

And a rubbish taping job

Ha ha ha ha ha ha ha ha ha!