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Pilot Valves?

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: jackssmirkingrevenge » Fri Sep 20, 2013 6:50 am

oneocim wrote:Yes of course, hammer valve, I love hammer valve, I made a simple and cheap one like this for my gun...


Ghetto but very nicely done, bravo!
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Unread postAuthor: oneocim » Fri Sep 20, 2013 11:07 am

Thanks Jack, by the way, I know that you'r the expert in this hammer stuff, I don't want to make a new post so I will just put my question here (I hope its OK).
Is it possible to make semi auto with my previous configuration? simply using the air from the pilot area to push the hammer back or is it going to influence the performance in emptying the pilot chamber? I haven't try this since it is quiet difficult with the tools I have to make the hammer air tight and so I want to be sure before I make it. I can remodel my hammer lock so it can catch the hammer independently from any trigger position.
Sorry if there is someone has tried that, you can gently put the link if there is.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 20, 2013 12:14 pm

here is one idea I had contemplated, never built it though:

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Unread postAuthor: Brian the brain » Fri Sep 20, 2013 12:30 pm

It should work well with a piston-hammervalve combo.
It's something I have wanted to try for a long time.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: oneocim » Fri Sep 20, 2013 9:14 pm

hi jack, that one is using hammer valve only, mine will use the piston valve for shooting and the wasted air from pilot to push back the hammer, so I can use this air freely without to worry loosing the shoot power. And for the bolt, I connected it to the trigger (I just need to pull the trigger longer until the ammo is out of the barrel).

I tried last night with a tigher hammer not fully air tight just almost like the valve piston, and it was only pushed back half the way.
I used 70psi (sorry that the max I could get for continous steady suply), but if anyhow I used higher psi, I will need between stronger spring, further travel distance or hevier hammer to open the valve and all that will add work to push it back.
Maybe I should also experimenting with the size of hammer face (right now it is the size of half inch pvc shc40 id). Should it be smaller or bigger?

Brian, please try it.
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 21, 2013 10:42 am

You should try a balanced valve as a pilot in the same way that BTB did it. This isn't being held shut by the pressure, so it doesn't need such a strong hammer.
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Unread postAuthor: dart guy » Sat Sep 21, 2013 7:35 pm

you should pm wyz... (what ever his name is) and show him that because that would be a wastless hammer valve. right :? ?
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Unread postAuthor: oneocim » Sat Sep 21, 2013 9:57 pm

thanks guys, I have been trying making that balance valve (for other type gun) but never succesfull with the tools I have and pvc, its so hard to find nice o-ring in local market here, I'm trying to avoid o-ring as posible at the moment. Anyhow that info is usefull somehow, I haven't tried to modified the valve itself.
OK, I'll try what I have in mind now.. I'll make a new post if its going well - don't want to hijack this post to much.
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