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CO2 bottles

Tom72

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25 Mar 2021
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Leeds
Hi, I am thinking of getting a dual CO2 regulator, I already have a small 40ltr tank running a single stage from a soda stream bottle. This will be for my 200ltr tank and I prefer to get a large exchangeable gas cylinder, so I have 2 questions really;
Do I need any specific type of CO2 cylinder, as I have seen kitchen grade and others so which should I go for?
I am in Leeds West Yorkshire, does any body know of a good supplier of CO2?
Thanks
Tom
 

Andy Pierce

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27 Nov 2020
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Cambridge, UK
I have found that adding a secondary flow restrictor between the regulator and the needle valve can make life a lot easier for the needle valve. I picked up one of these for cheap (£5) and was pretty happy with the difference it made: Controlling aquarium CO2 | Fireplace aquarium
Recently I managed to pick up a high-tech porous metal flow restrictor from Mott and am REALLY happy with it. I almost don't even need the needle valve anymore:
These are also not cheap but if you need really precise control over low flow CO2 these are amazing (I also have a HOKE MicroMite needle valve, but if I'm honest that has been disappointing - the cheapo needle-valve with bubble chamber combo does a better job than the HOKE).
 

MrClockOff

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Zeus.

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It seems I can’t find anything on fleabay and only options are by ordering from manufacturers directly from US.. my feeling is that the shipping cost will be equal to the price of the valve..

Will be more than cost of valve if buying single unit :eek:

I have been doing some reading and do believe @Hanuman is on to something with the low spec needle valves most of us are using. Just a case of find a needle valve which is more suited to low volumes which sells in the UK. Yet to find anything which has a decent spec and PDF to confirm.
 

Hanuman

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It seems I can’t find anything on fleabay and only options are by ordering from manufacturers directly from US.. my feeling is that the shipping cost will be equal to the price of the valve..
Yes they are rare.
Will be more than cost of valve if buying single unit :eek:

I have been doing some reading and do believe @Hanuman is on to something with the low spec needle valves most of us are using. Just a case of find a needle valve which is more suited to low volumes which sells in the UK. Yet to find anything which has a decent spec and PDF to confirm.
This is well known among plant farmers or those who actually make their business to grow plants. Having proper constant and reliable CO2 flow is important and no low end CO2 nail valve can provide that.

If you guys need a contact of the person who sells custom made second regs/needle valves I can provide. PM.
 

Zeus.

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We can get them in the UK Swagelock

1617723702412.png


Plus vat and delivery
Angle version POA
1617724320935.png


Female version
1617724289570.png


Brass a bit cheaper
1617724535529.png
 

Hanuman

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Going stainless steel is purely a luxury if you have lots of cash to throw out of the windows then why not, but the chrome plated brass will do the exact same job. No differences there for our purposes. Looking at it more carefully mine is actually brass, not stainless steel so the model number is as the picture just above: B-2MA4.
 

MrClockOff

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Going stainless steel is purely a luxury if you have lots of cash to throw out of the windows then why not, but the chrome plated brass will do the exact same job. No differences there for our purposes. Looking at it more carefully mine is actually brass, not stainless steel so the model number is as the picture just above: B-2MA4.
Thanks, you just have answered my next question 😃 I think brass is more fragile material and it’s easier to screw up the thread. But being careful it should be no difference between two models.
 

Hanuman

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I don’t know how you handle stuff but I don’t even see how you would manage to damage the brass one unless hamering the valve or being a brute when screwing the valve. Brass is hard enough and most regulators are made out of brass as well. Remember these needle valves are lab or industrial grade valve. Beyond hardness the use of SS is also because in some instances these valves are used with high purity gases, or they are used in high pressure setups etc etc. Brass is prefectly fine for our use. SS is totally overkill IMO but if that makes people happy why not.
 
Last edited:

Zeus.

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Brass vs Stainless Steel


Quote
Composition and Properties
The best way to differentiate between brass and stainless steel is to know their composition. Brass is an alloy of copper and zinc, while steel is an alloy of iron, carbon, and chromium. Just by their base metal, you can easily tell which has suitable properties for particular applications. For instance, in terms of corrosion resistance, iron pales in comparison to copper. In fact, iron is the metal that makes ferrous metals rust fast.

Simply put, brass is generally more corrosion-resistant than stainless steel. While the addition of chromium to steel makes a whole lot of difference to its ability to resist rust, it is still susceptible to corrosion at some degree.

When it comes to electrical and thermal conductivity, brass outmatches stainless steel by fifteen times. It also has a higher thermal expansion coefficient, which makes it perfect for applications that involve extremely high temperatures, including furnaces and engines.

In terms of manufacturing cost, there’s no significant difference between brass and steel, although steel is much more difficult to machine than brass. Brass, after all, is well-known for its machinability, which is why it is the metal of choice for applications that require small, precise metal pieces, so steel doesn’t stand a chance.

Stainless steel, on the contrary, has a higher resistance to petroleum products and many acids than brass, and it can be passivated in either citric or nitric acid solutions. Some grades of stainless steel are also superior to brass in more-aggressive marine environments such as fast-moving currents.
Unquote

Brass may be a better choice for our needs esp if its also cheaper
 

papa_c

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I would check out Camozzi RFO/RFU needle valves, I have retro fitted these to a CO2 Art regulator and they perform flawlessly.
 

Zeus.

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I would check out Camozzi RFO/RFU needle valves, I have retro fitted these to a CO2 Art regulator and they perform flawlessly.
Very affordable price and all available on fleabay 👍 Do you remember exact model you have? I’m not very good on datasheets..

RS components for one do stock quite a few different brands of needle valves of very similar valves at competitive prices as these. However as @Hanuman points out they haven't been designed for the low flow rates we use, so although they may work they don't give the same level of control for the low flow rates as the quality needle value designed for low flow rates.
 

MrClockOff

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RS components for one do stock quite a few different brands of needle valves of very similar valves at competitive prices as these. However as @Hanuman points out they haven't been designed for the low flow rates we use, so although they may work they don't give the same level of control for the low flow rates as the quality needle value designed for low flow rates.
Ah OK I can see now the difference and this explains the price too
 

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