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Pop-off valve build

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Pop-off valve build

Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 4:57 pm

I started building a large 1'' pop off valve a couple days ago. I'll probably use it to make a full auto(QEV + pop-off) gun. The input is 1/2'' PVC. The piston is washers on a bolt with some rubber on the sealing face. I'm currently using a compression spring behind the piston. I have not glued this together yet so I have not done high pressure tests. I need to buy some more parts first. One problem I have is the compression spring only gives like 4 pounds of force which is not much. And yes I got the idea from JSR.

Questions, comments, or suggestions are welcome.
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Pop off valve 001.jpg
The pop-off valve. It currently has a dry fit.
Pop off valve 002.jpg
Another view
Pop off valve 003.jpg
The piston. It has white grease on it.
Pop off valve 004.jpg
Exploded View.
Pop off valve 005.jpg
A look at the valve seat.
Pop off valve 005.jpg (39.2 KiB) Viewed 1130 times
Pop off valve 006.jpg
The output. You can see the valve seat.
Pop off valve 006.jpg (33.43 KiB) Viewed 1130 times

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Unread postAuthor: archie370 » Tue Oct 23, 2012 6:59 am

Hey buddy is this a similar concept to the design with a QEV and the release gun (Sprinkler gun, Blowgun ) with a pilot on the end .. if so how do you make it fully automatic, with the QEV and the piston . ?
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 23, 2012 8:13 am

Hadn't seen this, looking good! Consider using an air spring if a coil spring doesn't have the cojones.
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