Pop-off valve build

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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PotatoEnemy17
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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.
Attachments
The output. You can see the valve seat.
The output. You can see the valve seat.
Pop off valve 006.jpg (33.43 KiB) Viewed 2198 times
A look at the valve seat.
A look at the valve seat.
Pop off valve 005.jpg (39.2 KiB) Viewed 2198 times
Exploded View.
Exploded View.
The piston. It has white grease on it.
The piston. It has white grease on it.
Another view
Another view
The pop-off valve. It currently has a dry fit.
The pop-off valve. It currently has a dry fit.
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archie370
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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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jackssmirkingrevenge
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Hadn't seen this, looking good! Consider using an air spring if a coil spring doesn't have the cojones.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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