Login    Register
User Information
We are a free and open
community, all are welcome.
Click here to Register
Who is online

In total there are 61 users online :: 5 registered, 0 hidden and 56 guests

Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: auxiliary, Exabot [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Global Moderators
global_moderators.png CS

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.
  • Author

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.
  • 0

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 1042 times
Pop off valve 006.jpg
The output. You can see the valve seat.
Pop off valve 006.jpg (33.43 KiB) Viewed 1042 times

Staff Sergeant
Staff Sergeant
Posts: 100
Joined: Tue Apr 10, 2012 6:33 pm
Reputation: 0

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 . ?
  • 0

‎"what happens in Vegas, stays in vegas!.... Except herpes, that crap'll come back with you"
User avatar
Staff Sergeant
Staff Sergeant
Posts: 112
Joined: Sat May 05, 2012 7:02 pm
Location: US
Reputation: 0

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.
  • 0

User avatar
Donating Member
Donating Member
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Return to Pneumatic Cannon Database

Who is online

Registered users: auxiliary, Exabot [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'