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Slide Check Valve Leaking

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Slide Check Valve Leaking

Unread postAuthor: moonmaster » Sun Jan 27, 2013 2:29 pm

I recently purchased a qev and slide check valve for use on a semi-auto. The qev works fine, but the slide check valve leaks when under pressure in either position. I tried lubricating it and inspecting the o-rings, but I can't figure out what's not working with it. I bought it new, and it looks exactly like this one: http://www.amazon.com/dp/B0002X93SU/ref ... B0002X93SU
I can provide pics if it would be helpful.
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 27, 2013 3:28 pm

Have you tried submerging it in water to see exactly where it's leaking from?
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Unread postAuthor: moonmaster » Sun Jan 27, 2013 3:44 pm

Yeah that was the first thing I did. It leaks out where the slide meets the inner cylinder on both ends, past the o rings.
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 27, 2013 4:00 pm

Does it leak above a certain pressure or at any pressure? Are you sure the o-rings aren't torn?
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Unread postAuthor: moonmaster » Sun Jan 27, 2013 4:10 pm

It leaks at any pressure, even 1 atm. I didn't see any tears in the o-rings, but it did seem to slide really easily. Also, the o-rings weren't the typical black rubber, but seemed more like a tan latex material.
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Unread postAuthor: moonmaster » Sun Jan 27, 2013 4:23 pm

I took the valve apart again, and there is a tear in one o-ring. Any ideas where I could get replacements?
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 27, 2013 4:32 pm

Nitrile.

Measure the size then eBay is your friend.

Have a look at the porting, the holes probably have sharp edges from poor finishing. A light filing would solve this.
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Unread postAuthor: moonmaster » Sun Jan 27, 2013 5:12 pm

Thanks for your help, I'll post pictures of the finished cannon when I'm done.
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 27, 2013 5:35 pm

In the meantime this chart is a useful reference: http://www.simritna.com/news/PDF/Simrit ... _FINAL.pdf
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