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Brazing kills sharders

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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Unread postAuthor: Gippeto » Sun Nov 30, 2008 2:49 pm

That wasn't so hard, now was it?

Much better. :)

I agree with the others that you have "cooked" the valve core. You will have to remove it and replace it.

This is the tool you will need to remove it.

http://www.expeditionexchange.com/air/DSC05516.jpg


This tool can be obtained wherever tire repair supplies can be found. For example a bicycle repair shop.

When you have removed your valve core, it will look like one of these.

http://www.geocities.com/cyqlist/springs1.jpg

As can be seen, they simply thread in.
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Unread postAuthor: ALIHISGREAT » Sun Nov 30, 2008 2:54 pm

you should be able to remove the core without a special tool with a small screwdriver (although it is quite tricky)

the if you have a spare bike tyre lying around, just take the core out of the schrader on that.
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Unread postAuthor: john bunsenburner » Sun Nov 30, 2008 3:01 pm

I have a spare valve some where, maybe there is another bike in my favorite fishing place again... Other wise i can buy a sharder and the tool, i could also make the tool it looks simple and i acctually understand the way it works, thank you for you help i will get straight to work tomorrow.
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Unread postAuthor: ALIHISGREAT » Sun Nov 30, 2008 3:09 pm

john bunsenburner wrote:I have a spare valve some where, maybe there is another bike in my favorite fishing place again... Other wise i can buy a sharder and the tool, i could also make the tool it looks simple and i acctually understand the way it works, thank you for you help i will get straight to work tomorrow.


you shouldn't need the special tool, just try and unscrew the core with something small.
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Unread postAuthor: john bunsenburner » Sun Nov 30, 2008 3:23 pm

Ok thank you i will try Alih,


@all: I will post the results when i am done and maybe i will make a step to step guide for later reference, i will maybe upload it onto that inscructables website, lets see if it works out though, thank you for your help. Tell me if there is anything else i need to keep in mind when doing this though it seems pretty easy todo.
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Unread postAuthor: ALIHISGREAT » Sun Nov 30, 2008 3:34 pm

There's not really too much to keep in mind, just unscrew the old core, screw the new one in!
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Unread postAuthor: john bunsenburner » Mon Dec 01, 2008 4:24 am

Ok i got really annoyed with all the fiddeling and just cut open the outer shell of the valve with a dremel, cooling it all the time, i now have this thing.(see pics) How exactly do i place it into my other valve now? :?:
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Valve part for replacement.jpg
The little thing inside my bike valve.
Valve part for replacement.jpg (8.88 KiB) Viewed 331 times
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Unread postAuthor: frankrede » Mon Dec 01, 2008 8:00 am

Seriously, did you have to cut it out? its called using tweezers and all you had to do was unscrew it.....
I hope you didn't damage the core.


THINK?
We are telling you to unscrew the core, now I wonder...how would one place on?
MAYBE JUST MAYBE...you can TRY and SCREW it in.
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Unread postAuthor: john bunsenburner » Mon Dec 01, 2008 8:11 am

Ok i was jut unsure, and it was obviously just rammed in, no tapping what so ever on the outer core(or the inner one for that matter) only tapped part was where it screwed into the pump.. And it is still ok, i tested it and it seal/opens when it should.
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Unread postAuthor: ALIHISGREAT » Mon Dec 01, 2008 12:51 pm

john bunsenburner wrote:Ok i was jut unsure, and it was obviously just rammed in, no tapping what so ever on the outer core(or the inner one for that matter) only tapped part was where it screwed into the pump.. And it is still ok, i tested it and it seal/opens when it should.


i can see the threads in those crappy resolution pics! you just screw it in!
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Unread postAuthor: john bunsenburner » Mon Dec 01, 2008 1:18 pm

I dont see them :? but i guess if you do, maybe i did not notice them. Ill screw it it and check the chamber, if it worked i will upload a crappy resolution pic of a rifle.
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Unread postAuthor: john bunsenburner » Thu Dec 04, 2008 4:05 pm

Ok i thank you all for the help, the sharder is ow fixed and working. Does any one know how much pressure the sharder will hold? I am planing to use a bulk tank and maybe i will need another valve altogether. If so, please tell me what valve i can use to fill the chamber and maybe even where i can get it.
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Unread postAuthor: microman171 » Fri Dec 05, 2008 2:56 pm

Please use a little seperation in your posts. I ha\/e read this whole thread and remember when it was hard to seperate. You need to gi\/e ea(h new idea a new line (maybe e\/en a gap between the lines). I am really sorry about the horrible tyeping. The keyboard here isn't typeing c, v, x, z, or enter. Hen(e why this post doesnt look too great.
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Unread postAuthor: john bunsenburner » Fri Dec 05, 2008 3:21 pm

Look, instead of giving me a comment like that just answer that last question of mine, like that I will not need to type any more post and thus seperation will not be an issue. I personally do not see the need for this seperation but if it helpy you, as the reader, then i guess i should use it.

What is the maxium pressure a sharder valve will safely hold?
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Unread postAuthor: Ragnarok » Fri Dec 05, 2008 3:28 pm

microman171 wrote:The keyboard here isn't typeing c, v, x, z, or enter.

Wait... What? You just did...

john bunsenburner wrote:What is the maxium pressure a sharder valve will safely hold?

I can't give a particular figure for your exact valve, as they do vary some what, but I have seen them used in excess of 400 psi - something like 30 bar.
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