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Old 06-28-2011, 11:57 PM   #1 (permalink)
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Sniper valve leaking on and off

I have a sniper set up 2k+ that I tried fixing numerous times.
Upon screwing HPA tank and turning air on, it leaks down the barrel softly. BUT.. it stops after 5 seconds (gradually slows down to stop). I would cock the pump and shoot it, leak starts again for about 3-5 sec again then stops.. (repeat)
just plain cocking it back doesn't stop the leak.


Fixes that I've tried:
Cleaned lower tube and inspect dirt/grime.
Changed cup seal and different valve body combinations - sometimes leaks would be stronger.
Changed valve body orings and oiled.

All the parts looks good, no cracks/scrapes in cupseal or oring. Internals are stock parts.
Any ideas? I've just had it..
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Old 06-29-2011, 05:08 AM   #2 (permalink)
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Sounds like a very slow recharge from your HPR or tank reg. I would try switching one of those out.
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Old 06-29-2011, 02:13 PM   #3 (permalink)
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Could just be that all of your cupseals are bad. How many did you try?

I've also heard someone here touting plexus as a leak sealer. Might be worth a try.
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Old 06-29-2011, 02:43 PM   #4 (permalink)
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did you try a different valve spring?
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Old 06-29-2011, 03:06 PM   #5 (permalink)
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You can try refacing the valve and cupseal. Remove the valve and stem, throw toothpaste on there and grind the seal against the face. If that doesn't work, take a metal plate or other very flat surface, put some fine grit sandpaper down *GRIT SIDE DOWN* and put toothpaste or polishing compound on the paper. Rub the seal against this in circles, making sure to keep it flat.
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Old 06-29-2011, 07:48 PM   #6 (permalink)
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I'm guessing it's recharge because the leak is stopping. Since the pressure is needed to hold the valve closed, a slow recharge could cause the leak until it's high enough to seal the valve. Plus, I find it hard to believe that every cupseal he tried would be bad.
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Old 06-29-2011, 11:25 PM   #7 (permalink)
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3 cupseals and 2 different valve bodies.
Ive tried pressing both cupseal + valve together and turning it round and round. the leak did lessen but still there. I havent thought about toothpaste however. Will try it as soon as I get home.

I've tried different regulators and different hpa tanks, no change (palmer fatty, hybrid sparta, mac dev gladiator, pe and myth reg.

Thanks for the suggestions.
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Old 06-30-2011, 12:05 AM   #8 (permalink)
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The reg sounded like a low probability problem, I'm very sure it's an issue with your sealing faces, either on the cupseal side or the valve face side. Fortunately it's easy to fix those as I posted above.
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