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1st 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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what do you think?

good
7
100%
bad
0
No votes
needs work
0
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needs work
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Total votes : 7
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1st piston valve

Unread postAuthor: unisonmind » Tue Apr 17, 2007 12:08 am

ok so i took the time to sit down and build a good piston valve. it cost about $15.00usd and it took me and my dremel less then 2 hr's from start to finish. but for anyone that as not played with a piston valve let me tell you something the amount of raw power you get is crazy. after this i don't think i will build a gun that has anything but a piston valve. for $15 i know i cant find a better valve.

but im here to see what all of you think of my new valve

its all in a 2'' sch 40 T with a 1 1/2'' port
-the piston is a 1 1/4 coupling
-the end cap is a sch 80 2''x1''npt bushing with some mod work on it
- and a 1/4'' ball valve for the pilot


i put some parts from other guns on it to test it. i did 4 dry fires at 100 psi and shot 2 potatos at 110psi but all in all it works great .

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Last edited by unisonmind on Tue Apr 17, 2007 12:30 am, edited 1 time in total.
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Unread postAuthor: keep_it_real » Tue Apr 17, 2007 12:15 am

That's sweet. I like it.

What's on the inside. Is there a piece of pvc that the piston slides in? I assume works like a barrel sealer right?

I know this is somewhat noobish so sorry.
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Unread postAuthor: hi » Tue Apr 17, 2007 12:18 am

what is that last picture, i know its what seals the end, but what is it made of?

that is a beautiful valve, its better looking than mine, it probly preforms about the same as mine, but looks a lot nicer.

keep it real- yes thats how the valve works, the piston it in a piece of 2'' pipe at least i think it is... it doesnt work LIKE a barrel sealer, it IS a barrel sealer.

edit- i cant read your avitar, whats it say, the one with the bathroom door girl on it?
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Unread postAuthor: surfbum » Tue Apr 17, 2007 12:30 am

where did you get those o-rings?
got any extra?
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Unread postAuthor: unisonmind » Tue Apr 17, 2007 12:51 am

keep it real- yes there is a piece of 2'' pipe in the T for the piston to slide in.


hi- the end cap is a Nibco 2''x1'' threaded
bushing that i cut down and i grinded the hex head flush

surfbum- i got the o-rings from lowes there in pluming 1 1/2 but it takes some work to get them over the 2'' bushing.and here is a pic of my avitar
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Unread postAuthor: Velocity » Tue Apr 17, 2007 5:30 pm

Very nice work one this; it really looks beautiful.

How did you get such nice o-ring grooves on the back plug? They look INCREDIBLE!
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Unread postAuthor: joe blogs » Tue Apr 17, 2007 6:01 pm

Is it possible to make a much smaller one for a pneumatic pistol?
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Unread postAuthor: Kenny_McCormic » Tue Apr 17, 2007 6:03 pm

probably chucked the piston in a drill and used a file to cut the grove.
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Unread postAuthor: Velocity » Tue Apr 17, 2007 6:05 pm

How do people put their pistons in drills though?! I have briefly tried to do this before, but I can never get the piston to stay in straight. My pistons are all solid plastic rod. Anyone have any suggestions for me? Having the ability to add o-rings to 2" pieces and below would be a HUGE asset for me...
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Unread postAuthor: unisonmind » Tue Apr 17, 2007 7:02 pm

rmich732-on my end plug i put the groves in with my dremel and a steady hand but on your solid rod you can drill a hole in it. put a bolt in and a nut to hold it still. thin put the bolt in the chuck on your drill
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Unread postAuthor: AmYisroelChai » Tue Apr 17, 2007 7:09 pm

rmich
How do people put their pistons in drills though?! I have briefly tried to do this before, but I can never get the piston to stay in straight. My pistons are all solid plastic rod. Anyone have any suggestions for me? Having the ability to add o-rings to 2" pieces and below would be a HUGE asset for me...

Anyone please correct me if I am wrong here:
If I am correct they put a bolt through the center of the piston extending past the piston at least ½” they then put the extended part of the bolt into the chuck of the drill.

In this case however the O-Rings were not cut into the piston itself. Rather they were put in the 2” Endcap. This prevented the Air from escaping out the back. Since remember it is only screwed in not glued.

Kenny_McCormic
probably chucked the piston in a drill and used a file to cut the grove.

If you look again the piston itself has no O-Rings on it.

Rmich- If you want o-rings on something there is the bolt idea I mentioned above. There is also the idea of using a Drill Press. Basically clamp down Two pieces of wood to the press whi will hold the [insert here what ever your cutting a groove into] in place. Two pieces of wood: Because one is for the Depth of the O-ring – you don’t want to go to far in. The other wood will hold the piece your cutting into in the exact place you want the O-ring to be.

unisonmind- I have a question for you (it’s a little noobie ;)

What fitting did you use on the top on Front of the 2” T?
(Also if its not too much to ask “Why?”)
VERY NICE PISTON.
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