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three way valve 300psi and up

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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three way valve 300psi and up

Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 1:01 am

i was wondering if anyone on this site would know where to get a high pressure three way valve, like a website or something preferable 300psi and up?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 1:13 am

http://www.ebay.com/itm/Paintball-Repla ... 27c02404fe

Works if you want it as a pilot valve for a QEV. If you need all thee ports threaded it's not suitable.
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 1:18 am

yeah i want a high pressure three way to pilot the qev, does it need to be high pressure?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 1:50 am

pneumatic_guns wrote:does it need to be high pressure?


It's best to use components at their rated pressure. There's always a safety factor built in, for example a QEV rated for 150 psi won't explode at 151 psi, but high pressures need to be treated with respect.

A "standard" metal body QEV can be taken to 300 psi with little worry, the main point which can fail is the piston/diaphragm but this is easily replaced.

What pressures were you planning on operating with?

The slide valve I linked to is good for 4500 psi, but if you're using it as a pilot it might be a good idea to bore out its exhaust ports as they are usually quite tiny on these.
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 2:14 am

i have found a qev that is rated at 6000psi :lol: but do you know where i could get a high pressure 3 way valve, because im not sure how i would make a trigger system for it and pressure from a soda stream bottle so 800psi

but i will probably regulate it down to 300psi because i will be firing 8mm steel bbs that are 2 grams each, this is my first time getting into pneumatic guns, i have built a ball valve rifle which runs at 160psi

and its pvc and i want to move up with air rifles so i have researched some possible ideas and i like design of wyzs newset rifle it seems easy to make and just need high pressure rated three way valve
:o
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 2:15 am

i mean the trigger system for the slide valve*** :?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 2:50 am

all you need to do is attach a trigger or rod to a trigger to the slidy part of the slide valve.

For example: http://www.spudfiles.com/forums/semi-au ... 22363.html

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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 3:07 am

how would i be able to make it spring back to qev charginf position?

or do i have to manually put it back
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 4:12 am

how would i be able to make it spring back


er.... add a spring?

Even a rubber band will do :)
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 4:22 am

Could I make a semi auto version with clip?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 4:30 am

http://www.spudfiles.com/forums/how-to- ... 24038.html

[Link removed by PCGUY, as it's source is giving users Malware warnings]
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 5:11 am

how about this, where do i find the trigger part.

http://www.hostingpics.net/viewer.php?i ... G_3190.jpg

which would be better that or slide valve?
thanks for being suck a big help! :D
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 5:22 am

A slide valve is a much better idea, because it eliminates the need for the ball valve (the one with the red handle in the pic you linked to) and lets you fire as fast as you can pull the trigger assuming you have a semi auto loading system, instead of having to refill the firing chamber every time.
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 5:33 am

is there such thing as a high pressure three way valve though? sorry to come back to this :roll: but i would really like to use a 3wv
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 5:39 am

A slide valve IS a three way valve.

From another post:

Basically something like this:

Image

When the valve is in the forward position, it allows air to flow from the main supply to the QEV and fill the pilot and firing chamber.

When the valve is in the rear position, two things happen:

- main supply is cut off

- QEV pilot chamber is open to the atmosphere, emptying it and firing the launcher

The valve goes back to the forward position (you need to add a spring or do it manually) and the cycle can be repeated.

Here's a nice 3/4" slide valve: http://cgi.ebay.com/Deltrol-SL35-3-4-Sl ... 2eb4b3739c

You could also get a cheaper 1/8" one and use an adapter: http://cgi.ebay.com/New-Paintball-Gun-S ... 2c5cefe367

This is the concept:

Image

The slide valve is basically a three way valve.

A three way valve has three ports, which we will call A, B and C

There are two possible paths, AB (with C blocked off) and AC (with B blocked off)

A is connected to the pilot area of the piston

B is connected to your 100 litre tank

C is simply left open to the atmosphere.

At rest, the three way is in position AB. This means your reservoir is filling the launcher chamber.

When the trigger is pulled, the valve switches to position AC. This means the reservoir is blocked off, and is no longer filling the pilot and chamber, while the pilot is exhausted to the atmosphere, which fires the launcher.

Once the trigger is released, the valve goes back to AB, refilles the pilot and chamber and the cycle can be repeated.
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