Walther Co2 cylinder filling

[Donross]

looking for info on Walther CP2 Co2 cylinder filling, how much co2 do I need to add to an empty cylinder in order to fill. I understand they are measured by weight.

[gingernut]

Weights for full and empty should be marked on the cylinder?

[Benelli B76]

Weighing after filling is to check how much you have managed to transfer. If you somehow fill too much liquid CO2 which occasionally happens, your pistol will not fire and you will have to vent a bit of gas. Normally you get a vent screw cap with the pistol. I used to fill my FWB Model 2 from a fire extinguisher as shown below. Now fill my Crosman 111.

Baz

https://i.imgur.com/1ADwNgG.jpg

https://i.imgur.com/xTP194I.jpg

[Donross]

this is what is on my cylinder
0.053kg kohlend10x10 Tarao.353kg

[hwtyger]

kohlend =co2
tara = empty weight iirc
So I think 53 gram
correct me if Im wrong

[Donross]

kohlend =co2
tara = empty weight iirc
So I think 53 gram
correct me if Im wrong

Just weighed my empty cylinder and it reads 356g so do you think it should be filled with 53 gram of co2 making total 409g

[gingernut]

I think that's right.
But weight is just a check.
There is no way you can squirt in 53 gm in a measured way.

Fill it and it will stop filling when pressure equalizes.
Hopefully it will work but if not check weight and vent as Baz says.

[Donross]

Thank you folks, great group this is.

[Donross]

Thanks for your help folks.

[hwtyger]

I think that's right.
But weight is just a check.
There is no way you can squirt in 53 gm in a measured way.

Fill it and it will stop filling when pressure equalizes.
Hopefully it will work but if not check weight and vent as Baz says.

I dont think it'll stop filling. CO2 doesnt fill by pressure it fills by weight.
It starts filling from 1 cilinder to the other because of temperature difference. (because you had yr cilinder in the freezer).
If there's a lot of temperature difference, it'll fill up fast(er). If there's too little difference, you wont get a complete fill.
You can easily overfill bulk CO2. But it shouldnt break yr Orings like pcp does. It'll be loud and inconsistent.
Just leave cilinder on few seconds with crane open. Than check weight.
When there's 53 grams in it, or near that, yr done.

[Donross]

I dont think it'll stop filling. CO2 doesnt fill by pressure it fills by weight.
It starts filling from 1 cilinder to the other because of temperature difference. (because you had yr cilinder in the freezer).
If there's a lot of temperature difference, it'll fill up fast(er). If there's too little difference, you wont get a complete fill.
You can easily overfill bulk CO2. But it shouldnt break yr Orings like pcp does. It'll be loud and inconsistent.
Just leave cilinder on few seconds with crane open. Than check weight.
When there's 53 grams in it, or near that, yr done.

Thanks I will give it a go.

[MrChipShoulder]

Did you ever work out how to correctly fill your CP2?
I'm about to buy a CP3 and need some advice on filling with co2 from a fire extinguisher.

Sorry to drag up an old post.

[hwtyger]

All info you need is in this post

[derekm]

Be careful. I once overfilled one of my Walther CP2 cylinders by only 2 or 3 grams, but didn't vent down to correct weight before it warmed up and it blew a seal.

Vent down to correct weight immediately on filling.