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Old 06-10-2011, 10:11 AM   #1 (permalink)
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pirahna lb valve tube question

Does the pirahna hold air it its entire lower tube.

So theoryetically, one could drill and tap the front cap on it and put a pressure guage on.

Not what I'm doing, but the theory is the same.

Also, the front cap is soldered in, right?
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Old 06-10-2011, 11:57 AM   #2 (permalink)
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I don't believe so, but I could be wrong. If I remember correctly the LB I had a while back that front cap was some what loose/wobbly. But again I could be wrong.
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Old 06-10-2011, 12:50 PM   #3 (permalink)
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No, the lower tube is sealed off just in front of the valve. The front few inches of the tube isn't pressurized, it's mainly just cosmetic and gives you something to put the pump handle on. The front cap should just be held on by a set screw.
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Old 06-10-2011, 12:57 PM   #4 (permalink)
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Ok, so the air on the side goes directly to the valve?

Hmmm
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The prototype is usually the hardest - then come the refinements then the ooohs and the aaaahs but they are always preceded by the !#@!@#! and the !#!!#@!% and the GAAAAAAHS
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Old 06-10-2011, 01:05 PM   #5 (permalink)
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Into a small chamber that sits just in front of the valve, yes.
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Old 06-10-2011, 01:59 PM   #6 (permalink)
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Ok, I see

Could one drill a hole through the seal or maybe heat it and push it out
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The prototype is usually the hardest - then come the refinements then the ooohs and the aaaahs but they are always preceded by the !#@!@#! and the !#!!#@!% and the GAAAAAAHS

Last edited by slinger; 06-10-2011 at 02:03 PM.
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Old 06-10-2011, 03:07 PM   #7 (permalink)
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Not sure what you're asking. Are you trying to pressurize the whole lower tube or just find somewhere to put a gauge?
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Old 06-10-2011, 03:24 PM   #8 (permalink)
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Slinger... there is a disk in there at the front of the valve spool/body that comes out when you remove the valve. If you forget to put the disc back when you put the valve back, you will dump air through the front of the gun. So.... if you were to tap that area at the muzzle end of the valve chamber with a 1/8 NPT then you could run air in through the front of the valve rather than the side.

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Old 06-10-2011, 03:39 PM   #9 (permalink)
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Wait, what? The chamber the valve goes into should be soldered in there. The only thing that comes out that I'm aware of is the little brass "button" for the spring.
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Old 06-10-2011, 03:49 PM   #10 (permalink)
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Some are open in the front as they were basically factory converted 12 gram bodies. But even if not open, you can still easily (with a good drill press and a bit extension) drill and tap for a port.

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