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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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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 5:41 am

http://www.spudfiles.com/forums/buildin ... 24498.html

i want to make something similar to this, but i need a high pressure 3wv for it
because ill be firing 8mm steel bbs at 2 grams each and i really want to pack a punch! and if i rifled the barrel would it improve the accuracy of the steel bbs? , i want to use this for varmint rabbits, pigeons etc etc...
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 5:46 am

jackssmirkingrevenge wrote: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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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 5:48 am

^ this post can you get a high pressure 3wv the second one though?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 05, 2012 6:55 am

pneumatic_guns wrote:i need a high pressure 3wv for it


exactly, so a paintball slide valve is suitable.

because ill be firing 8mm steel bbs at 2 grams each and i really want to pack a punch! and if i rifled the barrel would it improve the accuracy of the steel bbs?


You can't use steel BBs with rifling, because steel against steel would wear it out. This is why bullets have soft jackets. What you want is a very tight barrel (barrel ID very close to projectile OD).

i want to use this for varmint rabbits, pigeons etc etc...


No you don't, because it's against the rules


the rules wrote:Discussion of shooting anything at any person and/or animal is prohibited, and may result in a permanent banning of your account.


Blessed be the regulations.

pneumatic_guns wrote:this post can you get a high pressure 3wv the second one though?


http://www.ebay.com/itm/Female-Full-Por ... 4ab721d268

slide valve is a better idea though.

slide valve

SLIDE VALVE!!!!

Image
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Unread postAuthor: pneumatic_guns » Fri Oct 05, 2012 7:01 am

Oh I didn't know about the rules then I shall use it for target :) and yeah slide valve it is!!! Thankyou so much!
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Unread postAuthor: POLAND_SPUD » Fri Oct 05, 2012 7:17 am

slide valve is one option...

...but you might also look for 3 way valves on ebay but first you need to know what kind of valve you need

more on that here -> http://www.spudfiles.com/forums/directi ... 20438.html
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