I just got shot in the mouth by my on/off valve

[Eric_AGD]

Since this has now turned to name calling, I am going to try and shift back to the topic. If the on off is shooting out with the external air supply removed, there is still air in the firing chamber. This is probably caused by the way the marker is degassed. If you pull the trigger while degassing the marker, the chamber is isolated from the outside world and the on off pin will end up with equal forces pushing up and down, therefore it will not move and gas is trapped in the chamber. For guys/girls with screw in tanks, try to unscrew the tank without shooting the gun down. If it is to difficult to unscrew, take only 1 or 2 shots, release the trigger and then unscrew.

I am working on this here, but it is always easier to fix a problem if you have a gun with the problem. If you could try this, and let me know what happens, it would help me narrow down the problem.

Thanks,
Eric

[Digits]

^^

hmmm, ok..

Thanks.. I'll just remember to point the gun away from me from now on ..

[GT]

Originally posted by Eric_AGD
Since this has now turned to name calling

ok?

I am still kinda confused how the valve could contain any AIR? Lets say you hold the trigger pull that tank off. at some point you release the trigger, wouldnt any air remaining flow back towards your ASA adapter?

jb

[hitech]

On a classic valve it should. On a ReTro based valve the on/off pin would/could be pressurized from the underside of the top part only and would "stick" in the "off" position.

[Eric_AGD]

On a classic valve the on off pin has the same sealing diameter on both the top and bottom, compared to an RT style that has a bigger diameter on the top than the bottom. When you pull the trigger on a classic valve, then remove the outside air source, the on off pin will have equal forces (caused by the psi remaining in the chamber) pushing in both directions, therefor it is neutral and will not move back down to open the valve. This may be a little unclear if you are not really familar with how the valve works. I will try to post a picture to clarify.

[hitech]

Originally posted by Eric_AGD
On a classic valve the on off pin has the same sealing diameter on both the top and bottom...When you pull the trigger on a classic valve, then remove the outside air source, the on off pin will have equal forces (caused by the psi remaining in the chamber) pushing in both directions...

Good point. I hadn't thought of it that way.

[j.t.]

So that means that it should be impossible for it to shoot out despite the pressure remaining in the chamber because the force holding the pin in remains equal?

[Eric_AGD]

j.t.

If you look at the picture above, you will notice that the on off bottom only has 1 oring, and that is towards the bottom of the valve. As long as there is pressure in the chamber, the on off bottom is being forced down (or out of the valve body). The on off bottom is not attached to the on off pin.