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Hammer valve design?

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 valve design?

Unread postAuthor: limbeh » Sun Dec 20, 2009 10:22 pm

Hi,

I've been trying to find a diagram explaining how a hammer valve works. Have been searching the site (esp this section, the theories section & the howto section), but either search hates me or my comp hates me, and the past half an hour of searches turned up totally different (and irrelevant) stuff. Googling wasn't much better, I got hundreds of pages of water hammer that resulting from screwed up valves.

Can any kind soul provide me with a link?

Thanks.
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Welcome to Singapore.

The laws are stricter concerning spudguns than anywhere in the West.

Even the Aussies for all they complain have it good compared to us.
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Unread postAuthor: cannon monkey » Sun Dec 20, 2009 11:09 pm

this is the best diagram explaning a hammer valve

http://www.zdspb.com/media/tech/animations/spyder.gif

hope that helps
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Unread postAuthor: Gippeto » Mon Dec 21, 2009 12:01 am

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Attachments
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Big Bore valve for a Condor
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 21, 2009 12:22 am

have a look here as well.
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Unread postAuthor: limbeh » Mon Dec 21, 2009 1:17 am

Wow.....according to the post I saw, the guy said it was simpler than a piston valve. This looks more complicated.....anyway I'll try to replicate it.
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Welcome to Singapore.

The laws are stricter concerning spudguns than anywhere in the West.

Even the Aussies for all they complain have it good compared to us.
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 21, 2009 1:22 am

limbeh wrote:This looks more complicated.....anyway I'll try to replicate it.


You can make things simpler by adapting off-the-shelf parts. If you cut up a blowgun, that's essentially your valve ready, then all you need is a hammer. A heavy duty stapler or cap pistol are good examples of ready made "hammers" that can be adapted for your purposes, as in these suggestions:

Image

Image

I would also advise you to take a look at Antonio's designs like the P2 and P3, simple well made hammer valves that can be cooked up in any workshop.
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 20, 2010 1:21 am

Further to my suggestion that a stapler gun would make a good ready made hammer, it seems someone has done it for a 22LR zip gun :D

Image
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Unread postAuthor: Gippeto » Wed Oct 20, 2010 1:54 am

Now THAT"S hard...core...friggin....ghetto! :lol:

Where do you find this crap Jack? :roll: :wink: :lol:
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 20, 2010 2:06 am

Gippeto wrote:Where do you find this crap Jack? :roll: :wink: :lol:


Added a new gun blog to my daily links ;)
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Unread postAuthor: maverik94 » Wed Oct 20, 2010 2:17 pm

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Current Project: None, I'm in Spudremission.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 31, 2011 10:31 am

Another "staple gun", 12 bore this time :D

[youtube]http://www.youtube.com/watch?v=VKQUMIfTHh4[/youtube]
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Unread postAuthor: Technician1002 » Thu Mar 31, 2011 12:06 pm

Ummm.. we might want to limit posting weapons and stick to sports before the thread gets locked.

Great ghetto award candidate anyway Jack. :D
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 31, 2011 12:22 pm

Technician1002 wrote:Ummm.. we might want to limit posting weapons and stick to sports before the thread gets locked.


I'll concede that this is an actual firearm and therefore perhaps a grey area in terms of forum rules, however it is not a weapon.

A weapon is usually defined as an object or instrument used for attack or defence in combat - this means that virtually anything can be used as a weapon, and the simple ability to cause physical harm does not define an object as a weapon.

If the latter definition is to be accepted, all spudguns would be perfectly described as being weapons, even those that fired marshmallows ;)

For example, is the AS "Val" 9x39mm semi-auto a deadly suppressed weapon for the urban sniper? No, it's alife-saving icicle remover ;)
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Unread postAuthor: Technician1002 » Thu Mar 31, 2011 1:04 pm

True there are some wild definitions of "weapons". Most of them are defined by their intended use. In law, using common items as weapons makes them weapons by definition of the use. This includes fireplace pokers and baseball bats.

They by defined use, are not weapons, but remove them from by the fireplace or sports field and taking them to a jail and the intended use suddenly changes.

The zip gun is implied to be a makeshift weapon. Same for the shotgun.

The marshmallow cannon is sporting equipment, never intended to inflict harm to anyone and used for competition marshmallow acceleration. As such it is not a weapon.

Loaded with buckshot and kept with a can of compressed air by my door would change it's status. Stored in the house with the compressor out in the shop makes it useless as a weapon, unless I tried to use it as a baseball bat at a gang fight. I wouldn't want to dent the chamber though.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 31, 2011 1:38 pm

Technician1002 wrote:The marshmallow cannon is sporting equipment, never intended to inflict harm to anyone and used for competition marshmallow acceleration. As such it is not a weapon.


True... but if you fired it at someone though, it would be correct to define it as a weapon, because it would cause physical harm.

By the same logic, the only way the device I posted could be considered to be a weapon is if it was demonstrated to be harming an adversary, a category under which fruit do not qualify - at least I hope not, because in that case most people on this forum have built and used weapons :)

I can't find a reliable attribution but someone once wrote:There are no dangerous weapons, only dangerous men
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