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Coaxial Hammer Valve Idea

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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Coaxial Hammer Valve Idea

Unread postAuthor: DerpWithAGun » Sat Dec 17, 2011 8:38 am

Hey guys,

I been thinking lately, the cartridge design which I want to use for my next airgun is kind of going to be a pain in the backside so I have been thinking....

Combining the coaxial design with a hammer valve. I was thinking this because well, the cartridges will be a pain in the backside because I have to make so many, but I really want a hammer valve design without cartridges. But If I have a hammer valve I have to have this huge pressure chamber that will hold 3000psi minimum to be able to shoot at high velocities. So I want this to be coaxial because it looks more awesome and will look more like a real firearm.

So I was wondering, has anyone ever attempted this or know of someone who has?

If I undertake this challenge, my minimum specifications are:
Barrel Length: Around 70cm long
Barrel Dia: 6mm
Chamber Dia: 1/2" / 15mm
Minimum Projectile Velocity: 350 fps
Projectile Weight: 30 - 35 grains (roughly 2 - 2.5 grams)
Maximum Pressure in Tank: 3000 psi (3000 psi is actually pushing it a bit. Might not even need that much pressure for 8 shots)
Minimum amount of shots per recharge: 8


The basic Idea I have for this is that the gun will be activated by pilot valve as normal. The piston will shoot backwards for half a second and then be quickly shut forward by a spring or other force back into the sealed position ready to be loaded with another bullet and then fired.

Tell me what you think guys? Yeah or Nay?
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Unread postAuthor: lklaussen » Sat Dec 17, 2011 9:07 am

Sounds great, but half a second sounds like a little too long to me.
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 17, 2011 9:43 am

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Unread postAuthor: Hawkeye » Sat Dec 17, 2011 9:44 am

That's what Brian did with Old Shat. It's not a hammer valve in the sense you think though. The hammer is just activating the pilot and indirectly opening the valve. You don't need anything like 3000 psi for what you're thinking.
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Unread postAuthor: DerpWithAGun » Sat Dec 17, 2011 7:07 pm

I'm thinking hammer valve as multiple shots before recharge and that's want I want to do but in coaxial style because I hate having huge air chambers showing. All I really want is just a simple hammer valve but the air chamber and the barrel are in coaxial style. I just thought of having the piston in there so that the gun will be stronger but I'll scrap that idea it seems to hard.

So can anyone tell me, hammer valve with a coaxial styled pressure chamber, has it been done? JSR, your link didn't tell me anything all it was is a simple coaxial.
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 17, 2011 7:36 pm

Image

All metal co-axial design.
Piston to be piloted by a hammer valve.
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Unread postAuthor: DerpWithAGun » Sat Dec 17, 2011 10:25 pm

jackssmirkingrevenge wrote:Image

All metal co-axial design.
Piston to be piloted by a hammer valve.


Yes, the valve will be piloted by a hammer valve, that's exactly like my cartridge design, it will just dump all of the air out at once, then you must recharge it. I want it to be piloted by a hammer valve and then make the design so the piston will quickly shut when it opens so I can have multiple shots before recharging with air, if that's even possible.

Might even just make a hammer valve, 2000 psi. Simple as that.
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Unread postAuthor: Crna Legija » Sat Dec 17, 2011 10:49 pm

BTB's old shat is what you want but use a coax not QEV for a main valve.
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Unread postAuthor: DerpWithAGun » Sun Dec 18, 2011 2:18 am

Alright, where can I find this "Old Shat"?
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Unread postAuthor: Crna Legija » Sun Dec 18, 2011 2:56 am

DerpWithAGun wrote:Alright, where can I find this "Old Shat"?


With the might power of search!
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Unread postAuthor: Brian the brain » Sun Dec 18, 2011 8:53 am

Here she is:
Image

Entire buildlog found here:

http://www.spudfiles.com/forums/old-sha ... 17827.html

long read though.
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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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