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Spring powered ball 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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Spring powered ball valve.

Unread postAuthor: Jack_Hogg » Sun Mar 16, 2008 8:03 am

I've want to make a pneumatic sniper rifle, so i've been brainstorming about the "Spring powered ball valve". I want to ask you guys if this is a good idea...

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Unread postAuthor: jackssmirkingrevenge » Sun Mar 16, 2008 8:12 am

It's much easier and more effective to mod a sprinkler valve.
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Unread postAuthor: Jack_Hogg » Sun Mar 16, 2008 8:21 am

there is no store in my region that sells a sprinkler valve.. but what kind of store sells these valves?
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Unread postAuthor: Carlman » Sun Mar 16, 2008 8:37 am

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Unread postAuthor: lockmanslammin » Sun Mar 16, 2008 9:29 am

JSR is right, it is much easier to mod a sprinkler valve, heck its probably easier to make a piston valve for that matter, but I'm having fun making a spring loaded ball valve. I'm accually using it as an exaust for a piston valve, but it will probably work as good as the piston valve itself by the time I'm done...

incase your curious, heres a link to my build thread...http://www.spudfiles.com/forums/ongoing-progress-update-pictures-t13286.html

have fun, Lock
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Unread postAuthor: sniper hero » Sun Mar 16, 2008 9:41 am

I made something like that but not totally pvc and I had similar problems but did you you think of the the piece of iron going at high velocity near the scope.and if you don't put something to stop the valve from turning more than 90 degrees the small normal stopper will break.

http://www.spudfiles.com/forums/viewtopic.php?p=164904&sid=821cfca3954325f6fc1fda8916b299de#164904 8)
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Unread postAuthor: SpudBlaster15 » Sun Mar 16, 2008 12:58 pm

You are going to need to apply one hell of a force to the ball valve handle within one hell of a short period of time to fall within the opening time range required for good performance on an average launcher. To give you an idea, an average piston valve has an opening time of less than 10 milliseconds. As far as I have calculated, this is almost impossible to obtain using any reasonable spring.

However, I'm pretty sure that the ball valve to which I briefly attached a flash powder driven ram opened in only a few milliseconds.
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Unread postAuthor: D_Hall » Sun Mar 16, 2008 1:12 pm

Jack_Hogg wrote:there is no store in my region that sells a sprinkler valve..

The internet is your friend....
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Unread postAuthor: hi » Sun Mar 16, 2008 2:54 pm

i used a bunch of rubber bands to open one of my first cannons.
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Unread postAuthor: Jack_Hogg » Mon Mar 17, 2008 1:45 am

SpudBlaster15 wrote:You are going to need to apply one hell of a force to the ball valve handle within one hell of a short period of time to fall within the opening time range required for good performance on an average launcher. To give you an idea, an average piston valve has an opening time of less than 10 milliseconds. As far as I have calculated, this is almost impossible to obtain using any reasonable spring.

However, I'm pretty sure that the ball valve to which I briefly attached a flash powder driven ram opened in only a few milliseconds.


Is this a good idea then?
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Unread postAuthor: psycix » Mon Mar 17, 2008 5:32 am

Ah a pneumatic ram actuated one.

Well if you can build an pneumatic ram then you can build a piston.
If you can build a piston then you can build a piston valve!
If you can build a piston valve then you can trash your ballvalve :)
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Unread postAuthor: sniper hero » Mon Mar 17, 2008 9:16 am

that's what I will do (I made topic on that)
I like the design but I will make it from metal and with a piston
there is only one problem: I can't find 45 degree angles in the right diameter :(
but you're thinking good before you post I like that :P
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Unread postAuthor: jimmy101 » Mon Mar 17, 2008 12:27 pm

SpudBlaster15 wrote:However, I'm pretty sure that the ball valve to which I briefly attached a flash powder driven ram opened in only a few milliseconds.


Ya, but by "opening" do you mean "opened as designed" or as "the entire gun disintegrated"? :twisted:


Back to the OP, trying to open a ball valve quickly is really a futile thing to attempt. In the long run, moding a sprinkler valve, or using a stock sprinkler valve, or building a valve from scratch is going to work better and be easier.
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Unread postAuthor: SpudBlaster15 » Mon Mar 17, 2008 12:34 pm

Jimmy, there is a good deal of reasoning behind using the word "briefly" in the above description. :lol:
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Unread postAuthor: DYI » Mon Mar 17, 2008 5:51 pm

However, I'm pretty sure that the ball valve to which I briefly attached a flash powder driven ram opened in only a few milliseconds.


It's good to see that one of us finally tried it.

And if possible, I want to see a picture of whatever was left of the valve and the ram afterward :lol:
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