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need help with a piston 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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need help with a piston valve

Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 2:55 pm

i am pretty new to pneumatic guns. i have made one with a ball valve and two with moded sprinkler valves. i would like to make a piston valve using a 1.5 inch T but after readng countless posts i still dont know what ppl use as the piston to get a good seal or what other parts are used. has anyone out there made one with a 1.5 inch T?...if so what parts did you use to make it and does anyone have some pics of constructing one. thanks
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Unread postAuthor: noname » Wed Aug 19, 2009 3:44 pm

<a href="http://www.spudfiles.com/spud_wiki/images/6/65/Qev.gif">This</a> may help a little; I'm not sure. To figure out what parts you need you really just have to play around with it and see what works.
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Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 4:00 pm

thanks for the response but i really have no idea how to go about making one. i guessing that one of these would really increase the velocity on one of my guns because it looks like a lot mor air can get through faster
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Unread postAuthor: jor2daje » Wed Aug 19, 2009 4:07 pm

here is my design which uses a 2 inch tee, which I recommend, you could just go a size smaller for everything, the only problem would be the piston, I'm not sure if a 1 inch coupler fits in a 1.5" pipe. If you really want to make it in a 1.5 inch tee you might have to make your own piston out of wood or another material, for a sealing face use neoprene rubber.
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Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 4:21 pm

so that "sealing face" in ur design is some neoprene? and that actually seals it?
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Unread postAuthor: jor2daje » Wed Aug 19, 2009 4:27 pm

Well when I made my piston, I used a rubber tile, it works great, the important thing to remember is getting the thing the piston seals against cut square and sanded smooth.
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Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 4:44 pm

how much of an increase if any do u think this adds to velocity of the projectile vs. a moded sprinkler valve?
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Unread postAuthor: jor2daje » Wed Aug 19, 2009 4:47 pm

Its a pretty big difference, it has way larger opening, and piston valves can have much higher porting.
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Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 4:47 pm

but how does air get behind the piston to force it shut against the barrel?
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Unread postAuthor: jor2daje » Wed Aug 19, 2009 4:49 pm

You fill from the pilot side, that forces the piston shut, then air escapes around the sides.
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Unread postAuthor: Tcoz370 » Wed Aug 19, 2009 4:55 pm

so it goes in the piolet side forces the piston shut then air goes around and fill the chamber? then i guessing u have a blowgun valve on the piolet side that releses pressure from behind the piston making it drop back and the chamber air escapes out the barrel
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Unread postAuthor: twizi » Wed Aug 19, 2009 7:52 pm

yes thats how it work but dude search there are 6 or 7 how toes just click how to and u would now how to make one
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Unread postAuthor: FORE!!!! » Wed Aug 19, 2009 8:10 pm

this might give u a bit of an idea

http://www.youtube.com/watch?v=vmxaI3_SJCg
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al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

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This collection of containers on your bedside table must look very intimidating to any visiting young ladies

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Unread postAuthor: Mr.Sandman » Wed Aug 19, 2009 8:17 pm

FORE!!!! wrote:this might give u a bit of an idea

http://www.youtube.com/watch?v=vmxaI3_SJCg


Whats funny is i posted that id in a topic a few months back. That guy in that vid is MRR on here so pm him for details
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Unread postAuthor: FORE!!!! » Wed Aug 19, 2009 8:31 pm

I must say its a very good effort at a tutorial, it certainly help me alot with getting my first piston gun made, kudos to MRR :wink:
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al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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