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custom auto 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: mark.f » Wed Apr 01, 2009 9:30 pm

Is that....

a threaded cap?

Another one!!! I've seen another one on Jack's work!

You, sir, are getting better at this!
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 01, 2009 11:00 pm

sniper hero wrote:about the pellet magazine, why not buy flat headed pellets and stack them horizontally?


They won't feed as well as round-nosed pellets

Also how big is this compared to the last valve?


The original version has a chamber made of the same grey PVC, so version 2.0 is only slightly shorter.

I have a feeling that it will work better without cap.


No it won't, the spring will fly out! :roll: :D

I see your point though, we'll see how it goes.

You, sir, are getting better at this!


There's only so much frustration coming from hacking apart siezed up epoxy casings that a man can take :P

If I can get it to pop reliably, I'll see what it does on single shots with anything from pellets in a 6mm barrel, BBs in a 4.5mm barrel and the smaller 3mm bearings I recently obtained, and we'll move from there :)
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Unread postAuthor: SPG » Thu Apr 02, 2009 7:50 am

Hey if the wrts comes to the worst and air leaks past the piston filling the area behind, you can always drill a little hole in the threaded cap can't you?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 02, 2009 8:27 am

I'm certain it will leak behind the piston, but fairly sure it won't be enough to affect performance. Ah well, leaving work in a couple of minutes so we'll know soon enough :)
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Unread postAuthor: SPG » Thu Apr 02, 2009 8:33 am

Istn't it more the case that if it's sealed behind the piston if it leaks it could just vaguely fill with pressurised air , and so you'd have less piston travel with each shot till eventually you've got the same pressure either side?

Although of course if it leaks in, it'll leak out.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 02, 2009 1:57 pm

SPG wrote:Istn't it more the case that if it's sealed behind the piston if it leaks it could just vaguely fill with pressurised air , and so you'd have less piston travel with each shot till eventually you've got the same pressure either side?


yada yada, turns out it'snot an issue :D
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