Tying to Locate Components for Making Syphon CO2 Tanks

[Trbo323]

Even if it has a hole, that's nothing a tap and plug screw can't fix

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[DocsMachine]

Doc, remember that accident where someone used too much loctite, and it plugged the safety vent... leading to a fatal accident.

-Oh, I understand the reasoning behind it, it's just that I never personally saw one that had both hole and groove. Most of my old ones just had the hole, a very few of the last 'new' ones I handled had a groove, but I suspect by the time both started filtering my way, CO2 in general was well on it's way out. (Personally, I haven't used CO2 since 2012, save in 12-grams, and it's probably been five years since I even filled a tank for a friend.)

Doc.

[Nish]

I really like the oring idea.

[Hp_lovecraft]

Doc, remember that accident where someone used too much loctite, and it plugged the safety vent... leading to a fatal accident.

They sued the company that sold the tank, even though nothing was wrong with the tank. Someone removed the valve to install an anti-siphon, globbed on too much loctite, and never bothered to properly retorque the threads when valve screwed back on.

The kneejerk reaction within the industry was to take all the tank threads in inventory, and cut a groove in the threads, on top of the existing vent hole. So that if the same situation happened again, the tank would vent properly. But the infuriating thing was that.... they made it impossible to install an anti-siphon, forcing people to look for older pre-cut valves.

And now everyone uses tons of loctite, even though tank manafacturers like Catalina are against it. Proper torque, and no loctite is the recomendation, since loctite damages threads, and is the #1 reason for hydro failure. (damaged threads fail visual inspection). Since then, you sometimes find valves with just the groove, and no hole, etc. You just have to keep an eye out.

just grinds my gears.

but to the OP, I probobly made a hundred siphons at "Adventure Games" back in the 90s. We would take some microline (the 1000psi kind, not the lp tubing). It was the same line we used to repair 68-specials internal line. Then we would put CP fittings at both ends. One end would screw into the valve, and the other end would serve as a "weight" so that it can draw liquid regardless of orientation. You want the line as long as possible before the CP fitting hits the bottom. I'd also put a fat oring around the CP fitting so its not as noisy when it "clinks" the side

[DocsMachine]

I thought this design shown here was the reason newer valves could not be used for Siphon tank applications? That groove and extra input hole would allow gaseous co2 to bypass the siphon tube was my understanding.

-Odd, I'd never seen that particular style. All the ones I ever dealt with with a groove, said groove was just on the outer threads, about 2/3rds of the way up, with no hole.

But yes, you're exactly correct- that style of valve would not properly work with a siphon.

Doc.

[Chappy]

Yup these need to be avoided. No matter what you put below that valve it’ll just suck gas through the side

[Chappy]

Unfortunately the one you posted above is the most common and does not work. I typically find the old ones and use those. I have seen grooved valves without the holes but they are rare in my experience. Much more common to see the hole without the groove but they stopped doing that since thread raked can block it.

[Meleager7]

Ok cool, I didn’t know the grooved valves come in two versions, one still siphon tank friendly, and the other not. Good to know!

[Chappy]

If the safety groove has a hole the goes though the stem then it will bypass the siphon and just suck gass through the groove. If it does not have the hole all the way through the groove then it will work.

Another issue with some more modern tanks is they are not all 1/8” at the plug.

[Nish]

Smiley, send me your zip code, I have some of the supplies. I'll get you a picture of what I have and I can send it to you for what ever shipping costs me.

[Meleager7]

-The "safety groove", at least as far as the siphon goes, is irrelevant. The groove is on the outside threads, and only comes into play if/when the valve is being unscrewed from the tank while it's still charged. Apart from that, it has nothing to do, for, against, about or with the siphon.

Doc.

Hi Doc,

I thought this design shown here was the reason newer valves could not be used for Siphon tank applications? That groove and extra input hole would allow gaseous co2 to bypass the siphon tube was my understanding.

https://paintball-online.com/valken-replacement-part-co2-tank-pin-valve/

[DocsMachine]

You'll also need to harvest older co2 valves from older tanks, that have no safety groove in the threads......

-The "safety groove", at least as far as the siphon goes, is irrelevant. The groove is on the outside threads, and only comes into play if/when the valve is being unscrewed from the tank while it's still charged. Apart from that, it has nothing to do, for, against, about or with the siphon.

Doc.

[Trbo323]

You'll also need to harvest older co2 valves from older tanks, that have no safety groove in the threads......

Why? I installed a AS in a valve that had the groove. It's the same idea just up instead of down

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[OpusX]

Ahhh I knew there was a reason I was keeping all my old Catalina bottles.

[Meleager7]

You'll also need to harvest older co2 valves from older tanks, that have no safety groove in the threads......