After seeing Split’s Hornet Shuttle Valve Mod, I wanted to make one, it's an amazing mod, however, at $10 apiece from McMaster, the shuttle valves are too pricey for me. I was looking around trying to find them cheaper when I ran across the picture here http://www.kepner.co...ttle_valves.htm and figured they could be made. The goop on mine are still drying, but they should be in a hornet tomorrow. I blew into them and it worked perfectly, but after the goop is finished drying, I’ll assemble it and see the real results.
4” of 1/4” OD, .170” ID vinyl tubing
7/8” of 3/8” OD, 1/4” ID vinyl tubing
3/8” of 1/2” OD, 3/8” ID vinyl tubing (optional, but recommended)
BBs. (1 per)
1/4” dowel rod (5 or so inches)
Your preferred cutters for tubing (X-acto knife, razor blade, etc)
Drill Press (preferred) or hand drill
1/4” drill bit
Start with your materials
Cut your 1/4” OD tubing into 3 parts, two will be the ends of the shuttle valve; the third will be the air exit. I cut all mine to about the same length.
Take the 1/2” OD tubing and slide it over the 3/8” OD tubing and center it. Like this:
This is slightly difficult, I took my vice, adjusted it to an opening of 3/8”- 1/2” and set the piece on it, then pushed the inner tube down while the edges of the vice held the outer tube from moving.
Once you have that centered, congratulations, you’ve finished the hardest part.
Now, slide in your 1/4” dowel to the two tube piece you just made.
The dowel will hold the tube so it does not collapse on itself while you drill. Drill a 1/4” hole (centered in the middle of the 1/2” tubing) through the 1/2" tube and through the 3/8” tube until you hit the dowel. Don’t drill through the other side of the tubing. Slide out the dowel. It should now look like this:
Now, put in one end of the input tubes, they form the top of the T shape. Put in the piece on the side and the bb. Make sure the side tubing does not protrude into the center, that will prevent the bb from moving and your valve won’t work.
And finally, add the other side.
Now, you can check it by blowing in one of the top parts of the T shape. The air should come out the side tube, but not the other end. If it all works, goop it up!
And you’re finished and ready to make a backpressure gun kick ass.
Hopefully it works, it seems to now, but we’ll find out when I put it in the hornet. Any tips/suggestions?
Edited to change spacing.
Edit2: Shit, I tested again by blowing in one output with the bottom plugged, it doesn't seal entirely with the other side, some air still leaks out. I'm working on fixing it by various means (changing from BB to 1/4" slingshot weight to other ball bearings) and funneling the edges of the tubes, anyone have any tips?
Edited by Hipponater, 26 July 2009 - 08:06 PM.