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What is a Hammer Valve?

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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What is a Hammer Valve?

Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 2:10 am

Hey guys,

I was wondering, what the hell is a Boss Valve and a Hammer Vavle? I've spent all avo looking for info on it but I've just had no luck...

I was told that those sorta valves are used on the homemade guns found here:

http://www.bryanandac.com/new_page_10.htm
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Unread postAuthor: us sniper » Wed Aug 01, 2007 2:17 am

I believe that the hammer valve is the valve used on most pump paintball guns. I think this might be it: http://www.ultratwistedpaintball.biz/mm ... imated.gif
As for the boss valve, I think it is mainly the same thing except scaled down to use the high pressure powerlets. The boss valve would be more of a tee set up because once the hammer strikes and pushes back the plug the air is supposed to up and behind the pellet. THe hammer valve has the hammer on the airtube so that it is made in a straight configuration which is good for a paintball gun. All that mean is where the air source is different. Boss valve has the co2 parrallel to the barrel and the hammer valve has the barrel opposite the barrel.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 01, 2007 2:17 am

A hammer valve is what practically every commercially made pneumatic airgun uses to fire - imagine a blowgun valve, but instead of pull it with your finger, a spring-loaded hammer strikes it and opens it briefly to allow enough air to fire one shot to escape from the reservoir.

Here's an old example, the Girandoni air rifle:

Image

The yellow striker pin is propelled by a spring to hit the valve and release a burst of air.
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Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 2:23 am

Geez that couldn't be anymore complicated to make :shock: . Has anyone ever tried to make one of these?

Thanks for the explatation too.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 01, 2007 2:38 am

a relatively simple way to make one would be to take a blowgun, remove the "trigger", then take the firing mechanism from a cap gun or similar and have the hammer strike the blowgun's valve stem.

I don't think it's a practical proposition for spudguns though. If you have a very (several thousand psi) high pressure cylinder and want to fire multiple shots, it will work, but for our applications a piston valve offers much quicker opening time and better flow.
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Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 2:48 am

Ah yep yep. I gotcha on how it works now. Thanks alot for the help.
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Unread postAuthor: Redcoat » Wed Aug 01, 2007 3:50 am

You know they used the Girandoni air rifle in the Austrian Army.Which i think is pretty cool. This gives me an idea.........hmmmmm.a spring out of a dart gun should do for the hammer valve.

Im gonna go and draw up plans for a hammer valve gun.

Happy Spuddin'
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Last edited by Redcoat on Wed Aug 01, 2007 3:53 am, edited 1 time in total.
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Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 3:52 am

Sounds great. You gotta give us a look when ya done. :D
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Unread postAuthor: Redcoat » Wed Aug 01, 2007 3:55 am

I will.I may even be able to finish it this weekend. 8)

edit- anyone know where to get metal bb's in AUS?

thanks,

Happy Spuddin'
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Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 3:58 am

Have a chat with Chaos. He saw some small chrome ball bearings on ebay.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 01, 2007 4:30 am

Redcoat wrote:You know they used the Girandoni air rifle in the Austrian Army.Which i think is pretty cool. This gives me an idea........


BTB had made a sliding block reloading mechanism based on the Girandoni, have a look here.
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Unread postAuthor: Mitchza89 » Wed Aug 01, 2007 4:41 am

Oh yeah I saw that. I wonder how well it actually works... :?
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Unread postAuthor: Redcoat » Wed Aug 01, 2007 4:42 am

thanks jack for the thread i think i might have it muzzle loader to start off with though and then move on to more advanced things.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 01, 2007 4:51 am

Mitchza89 wrote:Oh yeah I saw that. I wonder how well it actually works... :?


I see no reason why it shouldn't work well, It worked great on the Girandoni, you can ask Napoleon's men ;)

I had drawn up a design for an electrically powered BBMG where the sliding block was spring loaded (the spring kept it in the "closed" position, with the hole leading to the magazine tube) and the barrel permanently connected to the air supply. A motor with an eccentric cam moved the block, in the "closed" position it would pick up a BB from the magazine, the cam would push the block to the "open" position that allowed the BB to be pushed out, then the spring would return the block and the cycle would be repeated. Never built it though :roll:
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Unread postAuthor: Redcoat » Wed Aug 01, 2007 5:09 am

I might actually incorporate the design into a nice smooth looking pistol.It would be good as i lack a bb pistol that is powerful.But i will base it off the workings of girondi
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