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Hammer Valve

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Hammer Valve

Unread postAuthor: LGM » Tue Jan 30, 2007 8:42 pm

I have an old dissasembled BB/pellet gun and I was wondering how best to attach the hammer valve inside it to a mini.
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Unread postAuthor: BC Pneumatics » Tue Jan 30, 2007 8:52 pm

how is it attached in the gun? (Could you tap threads into it if they aren't already there, or is it too thin?)
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Unread postAuthor: jrrdw » Tue Jan 30, 2007 8:54 pm

Are you trying to make a pneumatic mini? Can you put up a picture of the hammer valve?
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Unread postAuthor: LGM » Tue Jan 30, 2007 8:56 pm

It is built into the main tube and I am having some trouble getting it out, and I don't think that it is a standard size so I probably couldn't thread it.
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Unread postAuthor: BC Pneumatics » Tue Jan 30, 2007 9:15 pm

You could possibly transition from the inlets and outlets provided to something more desirable using some hose and hose clamps.
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Unread postAuthor: LGM » Tue Jan 30, 2007 9:19 pm

The outlet comes out of a hole in the side of the pipe that it is mounted in, not a very easily affixed to place. But if I can manage to get it out of that pipe, I'll try the hose clamps.
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Unread postAuthor: BC Pneumatics » Tue Jan 30, 2007 9:22 pm

A few photos may make this easier.
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Unread postAuthor: LGM » Wed Jan 31, 2007 6:11 pm

Here's some pics.
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Attachments
100_0086.JPG
hammer and main tube
100_0087.JPG
I think this notch is what is holding the valve in.
100_0089.JPG
The valve outlet.
100_0090.JPG
looking down the tube at the part of the valve that is hit.

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Unread postAuthor: BC Pneumatics » Wed Jan 31, 2007 7:18 pm

I say make a saddle tee.
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Unread postAuthor: judgment_arms » Wed Jan 31, 2007 7:42 pm

LGM, I hate to burst your bubble but unless you can generate about 1000psi that valve’s going to be next to useless. Pump-pneumatic air guns generate as much as 2000psi, if you used the pump tube that would be a different story. What caliber are you going for?
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Unread postAuthor: LGM » Thu Feb 01, 2007 4:57 pm

What's a saddle tee, one that has only half of the long section?

And I was thinking of putting that pump tube under the valve to save space, would this be doable? Or using a small steel dry ice chamber. I was thinking of 1/8 to 3/8 inch.
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Unread postAuthor: jrrdw » Thu Feb 01, 2007 6:12 pm

A'm i rite in assuming when you cock the bb gun the trigger catchs the hammers ridge closest to spring, and then you pull the trigger, that releases the hammer, the hammer strikes a valve plate/diaphram.
Which then does what? Exactly?

Yes i have had pump up air rifles before, just never taking one apart.
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Unread postAuthor: judgment_arms » Thu Feb 01, 2007 8:47 pm

LGM, unless you can work with 1000psi I think, for simplicity and safety’s sake, keep it in line. And if your gun was not designed to use Co2 do not use Co2, Co2 guns and pumpers use different valves, a Co2 valve MAY work in a pump pneumatic, but a pump pneumatics’ vale is not designed to take the cold generated be Co2.

Jrrdw, although this page is an explanation as to why this type of valve “squanders air”, it should answer you questions as to how this type of hammer valve works.
Crosman airgun forum
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Unread postAuthor: LGM » Thu Feb 01, 2007 9:00 pm

I would not be using the original chamber, I would be using a larger steel chamber, so the cold probably wouldn't affect the valve. And since this wouldn't be straight from a liquified CO2 tank, the valve should work fine.
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Unread postAuthor: judgment_arms » Thu Feb 01, 2007 9:26 pm

LGM, the valve is the chamber. And DON’T USE Co2! You could screw up the valve.
What are you trying to make, what caliber? And airgun valves are designed for a specific task, i.e. shooting .117 or .22 caliber BBs and/or pellets.
What gun is you valve from (make and model)?
At the moment I am holding the valve out of a Daisy Power Line 856, valves like this are useless for any thing other than an airgun, and there not vary good at that job ether.
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