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Help on how repeating barrel-sealing valved airguns work?

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Help on how repeating barrel-sealing valved airguns work?

Unread postAuthor: jmez1996 » Tue Nov 30, 2010 8:15 am

Hi everyone.
I have basic knowledge and understand how barrel-sealing piston valves work and how they can be implemented into airguns.
What i dont understand is how people manage to make semi-automatic or even repeating airguns with these types of valves that dont completely empty the tank on the first shot.
here is a example of this being done: http://www.youtube.com/watch?v=DeRnZeZps4g

any information about how this gun or other guns manage to do this would be much appreciated so i can make my own.
cheers
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 30, 2010 9:08 am

Here's one I had made:

[youtube]http://youtube.com/watch?v=xKq4ktpplMA[/youtube]

This is what it looks like internally:

Image

The vertical schrader is the air input, the horizontal one is the pilot. Note that the piston is a good fit but not airtight, so air can flow from the main chamber to the pilot chamber.

When the pilot is opened, more air can flow out of the pilot than can flow past the piston, so the pilot pressure lowers and the piston opens.

One the pilot is closed again, pilot pressure starts to rise again, the piston reseals and the cycle can be repeated.

Substitute the manual pilot for a pop-off valve which automatically opens once a certain pressure is reached, and you have full auto ;)
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Unread postAuthor: jmez1996 » Tue Nov 30, 2010 9:25 am

nice valve man but i dont quite understand it. still im looking for a explanation of the link above.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 30, 2010 9:38 am

jmez1996 wrote:nice valve man but i dont quite understand it. still im looking for a explanation of the link above.


I believe it's this one, the maker is certainly a member of this forum so you can ask him directly ;)
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Unread postAuthor: jakethebeast » Tue Nov 30, 2010 2:15 pm

yeah that jsr coaxial pistongun is good version of semi auto barrel sealer.


BTW i see those same printer cardridge tubes again :D :D
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Unread postAuthor: wyz2285 » Tue Nov 30, 2010 2:34 pm

lol that's my gun :D but the one in the video is this http://www.spudfiles.com/forums/build-f ... 21582.html :)
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Unread postAuthor: clemsonguy1125 » Tue Nov 30, 2010 5:53 pm

Heres mine, basic barrel sealer piloted by a hose gun chamber filled and has a spring behind the piston. Ask anything about it if you dont understand
http://www.spudfiles.com/forums/semi-au ... 21627.html
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