Hi,

This might not be in the right category. Administrator feel free to switch it to another suitable category.

I need an adapter for my air solenoid valve but can't find it.

I would like to install a 25g CO2 cartridge cylinder (10,2mm thread (is that 1/8"?) in an air solenoid valve with a 1/4" thread (see other picture).
(10,2mm thread)


1/4" thread

I have several problems when searching for this.
One is my english. I don't know the correct search words to find what I am looking for.
Another problem is the dimensions mm/inch. It is hard to find corrects dimensions that fit together.
A third problem is that the Co2 cartridge cylinder needs to be punctured/opened by a needle when it is installed in the solenoid valve.

Does anyone know where I can find an adapter for this solution?

 

One way might be to use a bicycle CO₂ tire inflator and a ¼” NPT to Schraeder valve adapter.

​

 

I would like to install a 25g CO2 cartridge cylinder (10,2mm thread (is that 1/8"?)

Thread size if a standard canister, should be 3/8-24 inch type thread. 1/8 NPT(national pipe thread) is 27 pitch.

 

There's things like that in the paintball world. Or at least in the past; I added a quickchange adapter to a Nelspot 007 back around 1990. Although that was for the kind of CO2 cartridge that doesn't have threads. The cartridge fit into an opening on the side and then screwing down the knurled end cap forced it into the piercing thingy.

 

You will find that the standard solenoid valve is not suitable for the much higher pressure in that CO2 cylinder. So prior to anything else, verify the valve pressure rating, to avoid a very unhappy bursting experience, as well as incorrect valve operation.

 

Thank you for all of thoughts on this.

Yakoov
I have looked at the bicycle pump. it's available in Denmark where I live. But, the thing is that I can't have the cartridge mounted firmly. It will fall of. Unless I find something that can be screwed on the schraeder valve outside thread.

Shortbus
Its so confusing with all these different standards in different places. I live in Denmark and I presume we use the standard BSPP for pipe threads. So when I google for a solution and there is no information about thread standard i'm screwed.
I think the thread on co2 cartridges in europe goes by the type 1/8" BSPP.

Bass
Yes I've looked into that. The problem there is what you already pointed out. The cartridges for painball guns are without thread. And the big issue for me is to find anything that can be connected to one time use co2 cartridge cylinder with 1/8" BSPP thread.

Mister
I have come aware of that after I posted this question. I have also looked for a regulator or a regulator + adapter that could fit a one time use co2 cartridge cylinder with 1/8" BSPP thread but I had no luck. If one could be found remember that it should not only fit the cartridge but also have some kind of standard output threat like 1/4" BSPP or an adapter.


Overall I find it odd that the market for small co2 cartridge (12-16g) accessories as regulators, couplers, adapter etc are so poor. They would be a lot of fun and for great use in hobby projects.

If any of you find a regulator that fits these co2 cartridge cylinders, please let me know.

 

Thank you for all of thoughts on this.

Yakoov
I have looked at the bicycle pump. it's available in Denmark where I live. But, the thing is that I can't have the cartridge mounted firmly. It will fall of. Unless I find something that can be screwed on the schraeder valve outside thread.

OK, then maybe these. a little but convoluted, but...

An adapter from threaded CO₂ to M16;

​

one from M16 to 6AN flare;

​

then one from 6AN to ¼" NPT. I think this would work. I don't know if you can source the parts locally, though.

​

 

OK, then maybe these. a little but convoluted, but...

An adapter from threaded CO₂ to M16;

View attachment 265487​

one from M16 to 6AN flare;

View attachment 265488​

then one from 6AN to ¼" NPT. I think this would work. I don't know if you can source the parts locally, though.

View attachment 265489​

When building a practical prop for the stage play version of Frozen, I found like Yaakov that the best solution was a combination of different sized adapters.

Unless you have access to tools and a craftsman to make you a custom adapter.

BTW, the prop was a gun to shoot ‘snow’ and ‘ice’ by Elsa. The mechanism was hidden in the flowing sleeves of her gown.

 

Its so confusing with all these different standards in different places. I live in Denmark and I presume we use the standard BSPP for pipe threads. So when I google for a solution and there is no information about thread standard i'm screwed.
I think the thread on co2 cartridges in europe goes by the type 1/8" BSPP.

I just assumed they was a international standard like in most compressed gas fittings. That said, if it is BSPP you need to have a seal washer or copper crush washer at the point where the tank and fitting meet or it will leak. See here - https://www.ralstoninst.com/news/story/the-difference-between-npt-bspp-and-bspt-seals

A question, what is this going to do? If it is to make a paint ball or pellet gun the electric solenoid won't react fast enough to get consistent shots. This is why they use a spring loaded poppet type valve in them not solenoids. Air guns are one of my many hobbies and have tried to make one using a solenoid valve with little success.

 

You might find this article of use. There are several tips that you can’t ignore when working with CO2

 

I just assumed they was a international standard like in most compressed gas fittings. That said, if it is BSPP you need to have a seal washer or copper crush washer at the point where the tank and fitting meet or it will leak. See here - https://www.ralstoninst.com/news/story/the-difference-between-npt-bspp-and-bspt-seals

A question, what is this going to do? If it is to make a paint ball or pellet gun the electric solenoid won't react fast enough to get consistent shots. This is why they use a spring loaded poppet type valve in them not solenoids. Air guns are one of my many hobbies and have tried to make one using a solenoid valve with little success.

As mentioned in the article I provided, any seals, washers and/or grease MUST be rated for extreme cold. Rapidly expanding CO2 is well below freezing, and if your joints aren’t high pressure and cold resistant, the entire contraption will fall apart.

Update: corrected typo

 

As mentioned in the article I provided, any seals, washers and/or grease MYST be rated for extreme cold.

You didn't provide a link to the article.

My post was about the different threads his BSPP in particular. BSPP=British Standard Parallel Pipe

 

You didn't provide a link to the article.

My post was about the different threads his BSPP in particular. BSPP=British Standard Parallel Pipe

Crap… I hate when that happens.

https://www.cryofx.com/how-to-make-a-co2-blaster

I referenced your post because you talked about dealing with washers.

 

What I've done more than once when confronted with incompatible threads is to obtain a slip or friction fit somehow (drilling out, filing or turning down on a lathe), then stick it together with solder/silver solder/braze/welding (depending on what I have available). The toxic kind of silver solder is great because a propane torch is hot enough.

 

I hesitate to suggest soldering to a full CO2 cartridge, BAD events might result.
If this isfor a prop in a theatrical production, it may be possible to run a skinny tube from a regular CO2 fire extinguisher so that it is not seen by the audience. Skinny tube like used for medical oxygen assist arrangements. That will certainly allow more practice shots. And be more repeatable, and possibly even cheaper .

 

I didn't mean to suggest soldering to the cartridge (though if anyone attempts that, please record a video). I assume there's something out there that the 25g cartridge screws into, and fire and molten metal could be a way of adapting that to a pipe that threads into the solenoid valve. Tire inflators seem to be the most popular application; here's one at Ali for under $10 shipped.
https://www.aliexpress.com/item/4000580277471.html