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Hammer 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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Hammer Valves?

Unread postAuthor: VH_man » Sun Nov 25, 2007 1:45 pm

Well, i was messing around with a fire extinguishe, and the barel from my airsoft gun and i simply put the barrel in the exit of the fire extinguisher, pumped the extinguisher up to 300 PSI, then put a BB in the barrel, then whacked the top handle with a peice of steel pipe......

you might not think its powerful enough, but i can get off about 50-100 good powered shots (900-1000 FPS) and the noise it makes is about the same volume of a .22 rimfire...... same charetcheristics as well....

I was just wondering if anyone has experimented in a single shot hammer valve gun.

As of now, a push-button Valve from mcmaster sounds like it would work great as the actual valve. as for the hammer, a Chunk of steel that i found in my basement (about 1 lb....) and the main spring from an old spring shotgun, along with some kind of sear mechanism.

I feel like at 300 PSI and a good, efficient hammer valve i can make an extremely powerful pellet cannon that reloads by simply moving a lever back and forth.

anyway, my question is, has anyone ever tried a hammer valve?
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Unread postAuthor: JDP12 » Sun Nov 25, 2007 1:51 pm

wow thats a good idea, and no i have not tried a hammer valve, bu by all means go for it and let us know how it turns out!
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 25, 2007 2:41 pm

pumped the extinguisher up to 300 PSI


:shock:

With what?

as for the hammer, a Chunk of steel that i found in my basement (about 1 lb....) and the main spring from an old spring shotgun


Sounds a little overkill, I don't think the push-button valve will last long taking that sort of abuse, not to mention the massive stresses on the rest of your launcher to contail the power.
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Unread postAuthor: Wombat » Sun Nov 25, 2007 2:48 pm

Maybe one of those long and skinny PCP airgun pumps.
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Unread postAuthor: Zen/// » Sun Nov 25, 2007 2:53 pm

"Maybe one of those long and skinny PCP airgun pumps."

I saw at sum air gun site (I found the link here) those pumps for 189$ + :shock:

But they go up to 3000psi+ :twisted:
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Unread postAuthor: VH_man » Sun Nov 25, 2007 2:57 pm

i used my bike pump and two people to get up to 300 PSI......

Ill just use a hunk of Epoxy..... And no i did not say that to make you happy.. lol.

i jsut feel like i can machine epoxy. ive gone through 3 dremels trying to cut notches and things in metals.

I know that my goal is not for the valve to open 100% but to just get whacked open long enough to let a high-pressure spurt of air come out. then, the valve will close and pressures will equalize. to refire, recock the bolt.....

I want this to run off of regulated CO2. basically im making a homemade PCP...... well, kind of. its gonna shoot airsoft bb's.
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Unread postAuthor: experament-u2 » Sun Nov 25, 2007 6:33 pm

i think it sounds good
and you've given me inspiration to find that old extinguisher i had lying around here and do some tests

go for it chap
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Unread postAuthor: shud_b_rite » Sun Nov 25, 2007 7:28 pm

That was how I made my first pneumatic. What sort of fire extinguisher was it? Most dry powder ones are rated to 200psi.
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Airbeds... so many different uses
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Unread postAuthor: VH_man » Sun Nov 25, 2007 8:16 pm

its a dry poweder one.... it takes 300 PSI though.....

haha and ive inspired you...... wow.

i might have to post some vids. this thing can puch holes through both sides of a soup can with a steel BB......... well, both sides of about 4 cans.......
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Unread postAuthor: shud_b_rite » Mon Nov 26, 2007 1:19 am

Photo's or video's would be good. Im interested to see your trigger setup i.e steel pipe, to see how you get so many shots out of it. I used a 1kg tank at 120psi and just my fingers to trigger it and i could only get 1.5 shots (yes that is one point five). But yea that is impressive.
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Airbeds... so many different uses
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Unread postAuthor: VH_man » Mon Nov 26, 2007 6:30 am

Shud_b-Rite, my trigger setup was simply "hit top handle of fire extinguisher with pipe really hard"

it finally came down to a 8 inch peice of 1 inch PVC pipe duct taped to the top, in which i drop a roll of pennies. works like a charm.

i will have videos up eventually, i actually have school/sports, starting today, so it might be a while.
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