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Look Ma, no valve!

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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Unread postAuthor: LeMaudit » Wed May 20, 2009 6:51 am

I never actually made a prototype


At last! :hello1:
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Unread postAuthor: LeMaudit » Wed May 20, 2009 11:06 am

I had a quick try putting some pressure, but unlike what I thought the pressure leak around the central spring plug, not from inside (it is a tube on my quick connect, so I guessed it wrong).

So a sort of seal with a O-Ring or a washer is mandatory, and maybe a complete replacement of the internal mechanism, just keeping the ball locking. After all that's the most complicated part to build.
My first guess would be to drill through, and make something close to the left side of my previous drawings. A cooper tubing epoxied there (Yeah!) and a O-ring that touch the ball.

Maybe some other model of Quick-Connect would be more appropriate, as I have another one that doesn't look exactly the same inside.
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Unread postAuthor: JEK3 » Fri May 22, 2009 9:37 am

Instead of an o-ring, see if you could find a v- or w-ring. That way, the pressure would help push the seal against the ball (sorry, I'm at work and can't draw a picture right now).
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Unread postAuthor: LeMaudit » Fri May 22, 2009 9:45 am

I would be interested to see how they look like... can't find them at McMasterCarr, and never see those kind at HomeDepot and similar stores.
A link?
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Unread postAuthor: LeMaudit » Sat May 23, 2009 1:53 pm

For those interest by the idea of using a quick coupling, I am most pleased to announce that a 3/8" coupling is a perfect fit for the .56 ammo I want to use...

So laziness will certainly win, and at some point in time I'll try to convert a coupling to a trigger instead of making one from scratch :-D
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DSC06094.JPG
brand new 3/8" quick connect
DSC06095.JPG
with a 9/16" = 0.56 ball bearing inside
connector_cut_away.gif
Edit: Some food for thoughts...
The connector simply unscrew in 2 parts....
connector_cut_away.gif (11.41 KiB) Viewed 729 times
coupler_exploded.jpg
Edit: A disassembled male connector
coupler_exploded.jpg (34.37 KiB) Viewed 729 times
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Unread postAuthor: mark.f » Sat Jun 06, 2009 7:19 pm

Useless post, but just in case you're wondering how to take one apart...
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100_0215.JPG
A 1/4" auto coupling.
100_0216.JPG
Tools you may need.
100_0220.JPG
There is a snap retaining ring which prevents the sleeve from being removed. Relieve the coupling of it with a flathead screwdriver.
100_0221.JPG
After this, you will be left with the components below.
100_0222.JPG
Grip the main body as pictured to separate it. They are pretty tight...
100_0223.JPG
Now, you can remove the check assembly.
100_0224.JPG
Assembly is reverse of disassembly.
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Unread postAuthor: LeMaudit » Sat Jun 06, 2009 7:50 pm

Thanks mark.f

I guessed roughly that, but it is always nice to see a how-to !
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Unread postAuthor: mark.f » Sat Jun 06, 2009 7:54 pm

Yeah, I had one lying around, and I was curious myself.
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