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CO2 tank threads
Posted: Mon Sep 10, 2007 9:24 am
by noname
I've heard lots of people say that unscrewing the needle valve from a paintball Co2 tank is extremely hard or near impossible. Not true! All you need is a vice to hold the bottle and a pipe wrench to uncrew the valve. The bottle can be attached to normal steel or brass or whatever kind of pipe fittings you want, simply by using 3/8" NPT fittings.
A 9oz CO2 bottle would be a gret hybrid chamber, just put in a schrader valve spark plug (or an actual one if you have the tap), a propane meter and air source, a 3/8" union, and you're done. The bottle will never fail, because they can easily hold 3000 psi. An emty 9oz tank should be less than $10, cheaper than a Sch 40 steel chamber.
Posted: Mon Sep 10, 2007 9:29 am
by psycix
well ehm... cool
Posted: Mon Sep 10, 2007 6:00 pm
by CannonCreator
Wow! this is actually a good thing to know. Thanks for posting this!
Posted: Mon Sep 10, 2007 7:08 pm
by Scope
20oz co2 tanks are rated for 1800 psi i believe. burst disks are 1.4 k?
Posted: Mon Sep 10, 2007 7:17 pm
by iPaintball
Noname, don't make the same mistake I did. After you remove the needle valve, the actual bottle threads apper to be standard 3/8", but they are not. A 3/8" male fitting will screw in about one turn, but after that, it won't go in any farther.
Posted: Mon Sep 10, 2007 9:18 pm
by noname
I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting.
Posted: Mon Sep 10, 2007 9:23 pm
by frankrede
iPaintball wrote:Noname, don't make the same mistake I did. After you remove the needle valve, the actual bottle threads apper to be standard 3/8", but they are not. A 3/8" male fitting will screw in about one turn, but after that, it won't go in any farther.
no...I have done it and it works, but I use a 3/8" tap for even better threads.
Posted: Mon Sep 10, 2007 9:35 pm
by Orpackrat
Scope wrote:20oz co2 tanks are rated for 1800 psi i believe. burst disks are 1.4 k?
Burst disks are 3,000psi.
Posted: Tue Sep 11, 2007 9:01 pm
by beebs111
i was under the impression that burst disks were 1.5-1.6k but meh. what do i know?
Posted: Wed Sep 12, 2007 10:01 am
by )DEMON(
There are different strength burst disks I believe. When it says k for a value it usually means 1000x that number.
Posted: Thu Sep 13, 2007 3:49 pm
by dongfang
Hi,
I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting
Not that I know anything about it, but couldn´t it have been the case that one of you successfully screwed in a cylindrical 3/8 fitting, and the other one of you could not get in a tapered 3/8 fitting?
Regards
Soren
Posted: Thu Sep 13, 2007 5:14 pm
by iPaintball
That might act ually be the reason, but I can't find any non NPT thredded nipples...
Posted: Thu Sep 13, 2007 5:21 pm
by Hubb
dongfang wrote:Hi,
I was capable of screwing in a 3/8" nipple as far as it would go, or screw the needle valve all the way into a 3/8" female fitting
Not that I know anything about it, but couldn´t it have been the case that one of you successfully screwed in a cylindrical 3/8 fitting, and the other one of you could not get in a tapered 3/8 fitting?
Regards
Soren
Or maybe the threads got cross threaded.
Posted: Tue Aug 02, 2011 6:09 pm
by Gun Freak
I know this is an old thread, but I was going to start one just like it.
I want to take the pin valve out of a co2 tank, and then attach it to a slide valve/QEV gun for semi auto. I have a 3/8" tap (harbor freight junk) so will that work on the inside of the tank so I can use npt?
Posted: Tue Aug 02, 2011 6:52 pm
by Lockednloaded
I believe you'd need a 3/8" flare adapter to NPT, I've heard those fit perfectly