barrel sealing piston gun.Paintballs!

frankrede · Tue Apr 10, 2007 10:42 pm

Well I decided to stop messing with sprinklers and venture into the piston valve world.
I still need a end plug to finish and maybe a spring if mine is too short.
The barrel is 3/4 sch 80.
Perfect for paintballs.
The chamber had a crack so I had to cut it and install a coupler.
<a href="http://photobucket.com" target="_blank"><img src="http://i30.photobucket.com/albums/c325/ ... 7_1925.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

More pics of the piston and the various pics of the housing and vent system

go here for more pics
http://s30.photobucket.com/albums/c325/ ... PISTONGUN/

Velocity · Tue Apr 10, 2007 10:46 pm

That is looking pretty good. Is that a 2" chamber reduced down to a 3/4" barrel? Interesting...

This looks more like a diaphragm valve than a piston valve. The barrel portion of the sealing face extends past the center of the tee and past the beginning of the other leg of the tee, which I generally relate to a diaphragm valve.

Anyways, hope it turns out well!

TalonXxX · Tue Apr 10, 2007 10:56 pm

Looks schweet, very nice job! Way to come over to the dark side and start building guns with more power

I would have to agree with rmich, this does seem more of a diaphragm valve to me considering the placement of the barrel in the tee as well as the 'piston' you are using. Nevertheless, excellent job and I'm sure you will be pleased. Homemade diaphragms are a great way to transition into full blown piston valves with o-rings and such 8)

frankrede · Tue Apr 10, 2007 11:03 pm

Oh I thought diaphragms had to be floppy lol.
Ok so I guess it isn't a piston.
Oh well. Maybe my next one will be a full on piston valve.
I used 2" for the chamber because it was available. And it can't really hurt performance.

frankrede · Wed Apr 11, 2007 10:33 pm

Any other replies?

chaos · Wed Apr 11, 2007 10:44 pm

i like it alot?

nah really good job man, so what pressures u running it at? ive had mine at 260psi and its great i might take it over 300 one day.

i thought phrams had to be floppy as well, lol well ya learn every day

peace
chaos

frankrede · Wed Apr 11, 2007 10:46 pm

pressure 90-125 psi

frankrede · Sun Apr 15, 2007 10:15 am

Yay the jb weld is dry, today I test fire it

pyromaniac · Sun Apr 15, 2007 10:24 am

I like it. Post some splat marks after you fire.

Thats pretty clean priming and cementing. Unless you showed the "good side".

frankrede · Sun Apr 15, 2007 11:30 am

The gun works(most of the time) with lots of power! When I shoot it it leaves vapor cloud 3ft long and 2 ft wide!

It doesn't seal completely and leaks out the barrel slightly but It doesn't reall matter as I usually shoot right after filling.

rad14701 · Sun Apr 15, 2007 3:33 pm

If the rubber (neoprene?) is attached to the white disc (pvc?) then this is a piston gun, not a diaphragm gun, albeit a very short piston... A true diaphragm would be permanently sealed at its outer circumference and would rely on a concave pressure dome to seal the barrel... An exception to this would be a flap diaphragm which is hinged at an anchor point...

Regardless of what people choose to call it, you have a very sleek gun there... Nice job...

frankrede · Sun Apr 15, 2007 3:42 pm

Thanks for the clarification.

And the rubber is pond liner, i have over hundred pounds of the stuff/ and I couldn't find neoprene rubber at my local lowes.

frankrede · Mon Apr 16, 2007 6:52 am

Update:Heres a video!
version 1
version 2(better, and in slower playback)

frankrede · Mon Apr 16, 2007 9:17 pm

bump?

pyromaniac · Mon Apr 16, 2007 9:52 pm

nice vid thats hilarious seeing oust or any other comresed vapors explode.