need help with a piston valve

[Tcoz370]

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

[noname]

<a href="http://www.spudfiles.com/spud_wiki/imag ... f">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.

[Tcoz370]

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

[jor2daje]

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.

[Tcoz370]

so that "sealing face" in ur design is some neoprene? and that actually seals it?

[jor2daje]

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.

[Tcoz370]

how much of an increase if any do u think this adds to velocity of the projectile vs. a moded sprinkler valve?

[jor2daje]

Its a pretty big difference, it has way larger opening, and piston valves can have much higher porting.

[Tcoz370]

but how does air get behind the piston to force it shut against the barrel?

[jor2daje]

You fill from the pilot side, that forces the piston shut, then air escapes around the sides.

[Tcoz370]

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

[twizi]

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

[FORE!!!!]

this might give u a bit of an idea

[Mr.Sandman]

this might give u a bit of an idea

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

[FORE!!!!]

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