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valve questions

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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valve questions

Unread postAuthor: Strake » Thu Dec 20, 2007 6:45 am

once again i got a few questions which i actually searched for but to no avail.

does a piston use more air than a modded sprinkler valve? because of the exhaust valve
and is it possible to have multiple shots with a piston valve?

at the mo im just trying to gather as much info as possible to decide exactly what im going to put on my next pneumatic, my next one is going to be a metal marble sniper and hopefully it'll pack a punch.
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Unread postAuthor: Hubb » Thu Dec 20, 2007 6:51 am

Does a piston use more air than a sprinkler valve? If the piston is larger (and probably will be), it will. But it should be set up to use only the air needed for a proper pilot.

It may be possible to achieve multiple shots with a piston valve, but I do not know what direction to point you in.
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Unread postAuthor: Strake » Thu Dec 20, 2007 6:52 am

damn so there single shot what about a modded sprinkler valve is that multi shot or single??
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Unread postAuthor: The Kid » Thu Dec 20, 2007 7:08 am

Strake wrote:damn so there single shot what about a modded sprinkler valve is that multi shot or single??


bc vids has a how to vid on making a auto golf ball cannon using a sprinkler valve but your going to need a few extra bits and bobs to make it.
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Unread postAuthor: Strake » Thu Dec 20, 2007 7:14 am

that would be sic as it would do a bit of damage aswell :P . but i dont wanna make a auto i just want it single shot but more than one shot outta the chamber.
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Unread postAuthor: The Kid » Thu Dec 20, 2007 7:24 am

i hounstly would not know what to do mabey you could just do some reserch you can start here http://www.spudfiles.com/forums/semi-auto-t160.html
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Unread postAuthor: Hubb » Thu Dec 20, 2007 7:28 am

Maybe you could have a primary and secondary chamber. Set it up so that the primary fills the secondary, and the secondary is the one that fires the valve.

It would be suggested to have the secondary chamber smaller than the primary chamber and, depending on the chamber differences, you may get a few shots or a lot of shots. A portable air supply and regulator would also be recommended, as it will fill the primary chamber back to desired pressures.
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Unread postAuthor: Strake » Thu Dec 20, 2007 7:28 am

i see what you mean man thats got to suck having to refill the chamber all the time my current valve and chamber can get 6 shots before having to refill i may have to try and build something like my current valve but with a bigger airflow.
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Unread postAuthor: ShowNoMercy » Thu Dec 20, 2007 8:15 am

Or build a piston valve and use the Vogt pattern style. That will give you prob the capability to fire upwards of 20 marbles in real quick manner.
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Unread postAuthor: Strake » Thu Dec 20, 2007 8:52 am

yea dunno i was still looking for a single shot that you dont have to refill all the time
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Unread postAuthor: MaxuS » Thu Dec 20, 2007 12:53 pm

How are you getting 6 shots out of your current pneumatic, is it posted on the forum?

yea dunno i was still looking for a single shot that you dont have to refill all the time

Well if you're going to reload the ammo, then you might aswell refill the chamber, it shouldn't take more than about 30 seconds to fill a sniper sized chamber with a shock pump or compressor.

Edit: For power and looks that are superior to that of a modded sprinkler, go with a piston.
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Unread postAuthor: LikimysCrotchus5 » Thu Dec 20, 2007 3:13 pm

Well, you are trying to say that can you make a gun semi automatic with a piston?

Yes, it is very possible and has been done, using a piston valve. But these usually are more complicated than a standard pneumatic. But a general idea of some semi auto pneumatics, or getting more shots than one out of a chamber, is that you have a spring that is strong enough to close the piston fast enought so that all the air wont let out. This is placed behind the piston. But with extensive research, you can find it on this website.
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Unread postAuthor: MrCrowley » Thu Dec 20, 2007 6:55 pm

Strake wrote:damn so there single shot what about a modded sprinkler valve is that multi shot or single??


Sprinkler valves are multi shot as long as you have a continous air supply like an air compressor or CO2, you would also need a working mag that isn't effected by air sucking more then one projectile (spherical) out into the barrel.

With a piston it's the same, you just need air supply and a mag.
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Unread postAuthor: Strake » Thu Dec 20, 2007 8:57 pm

oh ok thats alright then ive designed another valve its like a piston but doesn't have a blowgun attached ive just got to get the parts and ill start building the prototype to test if it works which im fairly confident it will. and if it doesn't i reckon ill get me a sprinkler valve and mod it.

@ MaxuS i have not posted it as of yet im waiting to apply some paint and get some damage shots and then it will be on here. the valve im currently using was the one off of a fire extinguisher and it closes fairly quick so i get at least 6 shots the first 4 being powerful and the last few not as powerful.

@ LikimysCrotchus5 thanks for that my valve im working on now is going to have a fairly strong spring behind the piston. i bet that will cause me a couple of problems with the way ive got the trigger attached but its all trial and error
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