here is my piston gun valve but with a twist (not done)

[fretmelter]

ok i have made a copper gun. i used a piston valve. but instead of the sealing face pressing against the barrel like normal pistons. This on gets pushed inside the barrel. Like a barrel plug in paintball. Also this "plug" is actuated by a pneumatic air cylinder from a autococker. The actuator is double acting and will probably be controled by two blow guns. One for sealing the barell and one for unplugging it. here are pics and diagrams.

[potatoflinger]

Wow, nice work! I think that's the first gun I've seen that works like that, kudos

[fretmelter]

lol thnx i have been thinking of it for a while. it just needs tested now lol

[potatoflinger]

It should work, as long as you have a good seal around the plug, and you have a strong pneumatic cylinder.

[psycix]

The plug will need o-rings.
And I hope for you that the actuator will actuate fast enough.

If those things are done properly, youve got an awesome valve there!


BTW:
Unless you want to make a stock out of the chamber, the valve should be twisted 180 on the chamber elbow to get a more compact gun. (over-under)

[fretmelter]

yeah i know the over under thing but i like it better this way. and the valve is very fast. also the plug does have o-ring, 2 actually. the cylander can go back and forth about 40 times a second with the right valve. like i said it was made for autococker paintball guns

[psycix]

Okay then good luck with completing your build

[Carlman]

how much travel does that actuator have? and how much force?

there will be more and more force needed to open it vs how much psi you use. Whereas in a normal piston valve they opening force is relative to the pressure.

[fretmelter]

the actuator has about an inch to inch and a half of travel.
and it should be pretty powerful it as to cock back a paintball gun.