Sprinkler vavle seal problem!

[pvcmaster]

Hi, I am 15 and working on my first potato cannon, and am having some problems. I recently modified a sprinkler valve, but i cannot get it to seal. I know that I am supposed to clean and grease the valve, and i have tried that, but the valve continues to release short bursts of air when pressurized. I even tried adding a ball valve to help it seat, but it still fails once the ball valve is open. Anyone have any suggestions or see my problem?

[keep_it_real]

If the barrel is on the left in the picture than the sprinkler valve is backwards

[pvcmaster]

Thanks, that helps a lot, and also makes me feel like an idiot.

[BC Pneumatics]

Thanks, that helps a lot, and also makes me feel like an idiot.

Don't worry, it's part of life.

Live and learn, then build more.

[pvcmaster]

cannon works great guys thanks a lot for your help

[jrrdw]

Take a video of the carnage and post the fun!