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Quick connect coupling question

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Quick connect coupling question

Unread postAuthor: sharpshooter11000 » Sun Nov 27, 2011 4:05 pm

Does anyone know how I could remove the valve inside a quick connect coupling that stops air flow when the coupling is disconnected? Should I just drill it out? Thanks :D
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Unread postAuthor: Gun Freak » Sun Nov 27, 2011 4:26 pm

I've got one out with a hammer, just hit straight through with the threaded side down. Take some needle nose pliers and get the spring out of the way first if you can.
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Unread postAuthor: sharpshooter11000 » Sun Nov 27, 2011 4:57 pm

Thanks :D I'm trying to make a ballistic knife a bit like JSR's but that runs off 12g CO2 cartriges :lol:
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Unread postAuthor: Gippeto » Sun Nov 27, 2011 6:05 pm

Edit: DON"T use compressor type quick connects with un-regged co2...they are NOT designed for that kind of pressure.


Might want to check your state laws regarding these devices before you begin. IIRC, possession of a air or spring powered ballistic knife can lead to jail time in some states.

Better to check first...than be sorry later.
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Last edited by Gippeto on Sun Nov 27, 2011 6:07 pm, edited 1 time in total.
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Unread postAuthor: MrCrowley » Sun Nov 27, 2011 6:07 pm

Most quick connects can be unthreaded and dismantled.

Pull back the sleeve and remove the steel ring that stops the sleeve being pushed too far forward. I then stuck the hexagon end of the quick connect (that is for a spanner to grip and tighten when threading) in a vice and used a plumbing wrench to grip to the small area now exposed at the front of the quick connect when the sleeve is pulled back and where the ring once was to unthread the quick connect and remove the spring and seal. It may seem like quick connects can't unthread but you have to think "how did they assemble this without threading it together?" and you'll soon find a way to unthread it.
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Unread postAuthor: sharpshooter11000 » Sun Nov 27, 2011 6:23 pm

Thanks guys. And Gippeto I live in the UK so this mightn't be such a good idea... JSR made one though and I read somewhere that he lives in the UK.
Anyway, what pressure is un-regged CO2 usually at? I think I might just use compressed air at about 200 psi if I end up making it.
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Last edited by sharpshooter11000 on Sun Nov 27, 2011 6:27 pm, edited 1 time in total.
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Unread postAuthor: MrCrowley » Sun Nov 27, 2011 6:24 pm

sharpshooter11000 wrote:JSR made one though and I read somewhere that he lives in the UK.
Anyway, what pressure is un-regged CO2 usually at? I think I might just use compressed air at about 200 psi if i end up making it.

I can tell you he doesn't live in the UK.
Unregged CO2 is generally at around 800PSI depending on the temperature.
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Unread postAuthor: sharpshooter11000 » Sun Nov 27, 2011 6:32 pm

Ah ok then. My quick connects definitely won't handle that, they're rated for 200 PSI. I don't think I'll end up making it, firearms laws are pretty tight here :? Hmmm I think I know where he lives :lol:
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Unread postAuthor: MrCrowley » Sun Nov 27, 2011 6:34 pm

I think some people have used them at 500PSI but only when they were already connected and also not disconnecting them at that pressure. So don't think they would be safe for this particular build.
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Unread postAuthor: sharpshooter11000 » Sun Nov 27, 2011 6:39 pm

I might make a lower pressure sorta thing just for fun with compressed air. Thanks for your help :)
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Unread postAuthor: Gun Freak » Sun Nov 27, 2011 7:49 pm

QCs in the US can't be dismantled in the manner described by Crowley, at least mine can't.
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Unread postAuthor: Lockednloaded » Sun Nov 27, 2011 8:24 pm

really? mine can and I get them from homedepot. just grab the hexagonal part with one wrench and the part above the sleeve with the other.
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Unread postAuthor: MrCrowley » Sun Nov 27, 2011 8:24 pm

Mine is made by a manufacturer in Germany but I bought it in America :shock: :D

They're available in NZ as well.

Maybe it just seems like you can't dismantle them in the same manner, it took quite a lot of effort to get in to unthread.
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Unread postAuthor: Gun Freak » Sun Nov 27, 2011 8:39 pm

Alright I'll check it out tomorrow.
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Unread postAuthor: mark.f » Sun Nov 27, 2011 9:12 pm

I actually made a short write up on doing exactly what OP is asking... wait a tic...

http://www.spudfiles.com/forums/viewtopic,p,247242.html#247242
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