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Quick Question

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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Unread postAuthor: nadjatee1996 » Sun Apr 24, 2011 9:24 pm

Whats the best way to create a seal using O-rings? I need 3 seals made using O-ring as pictured below. Please help me JSR XD
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Unread postAuthor: Lockednloaded » Sun Apr 24, 2011 9:31 pm

O-rings generally require an O-ring groove and a smooth surface to seal on. If you're trying to ask JSR personallly though, just PM him
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Unread postAuthor: nadjatee1996 » Sun Apr 24, 2011 9:37 pm

No, you provided good insight, no offense, but JSR just popped into my mind when I was typing it, explain more about the grooves,please?
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Unread postAuthor: Lockednloaded » Sun Apr 24, 2011 9:45 pm

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Unread postAuthor: nadjatee1996 » Sun Apr 24, 2011 10:36 pm

That doesn't really help though..seeing how I need a flat seal...and thats for a piston..on a sidenote, I have no access to a drill press, although I can probably use a makeshift one by using a vise and a low/high powered drill. My previous, although failed seal, was a O-ring stuck to a piece of flat epoxy putty, which I then drilled a hole in, and then placed the rod through the hole. I then put more epoxy behind the epoxy putty so air wouldn't leak from the hole, but the epoxy putty isn't totally flat, and air leaks out from the sides of the O ring(against epoxy putty, because the PUTTY isn't flat enough...) Basically, my idea of the seal wasn't so bad in my opinion, but I can't get the O-ring to be completely air tight due to the lack of a true flat surface.

A bit confusing, but I also figured a few pieces of flat wood,some O-rings, and glue will do the trick, but the valve body is made of pipe, and I don't have any stores selling 1 in pipe cutters near my area. So, I need some sort of workaround XD
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Unread postAuthor: Lockednloaded » Sun Apr 24, 2011 11:08 pm

what do you need this sort of valve for? just build a standard hammer valve
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Unread postAuthor: nadjatee1996 » Sun Apr 24, 2011 11:44 pm

Any diagrams? Only thing Google tells me about is Valve Hammer and not hammer valve
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Unread postAuthor: Technician1002 » Sun Apr 24, 2011 11:50 pm

For a flat surface the o ring on the end of the barrel of my Mouse Musket is the other configuration.
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Mouse Musket valve seat is an o ring secured on the end of the barrel at the breech.
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Last edited by Technician1002 on Mon Apr 25, 2011 12:21 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 25, 2011 12:01 am

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Unread postAuthor: inonickname » Mon Apr 25, 2011 12:08 am

An o ring is made to seal between two cylindrical surfaces, not two flat ones. Use rubber washers/sealing faces.
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Unread postAuthor: nadjatee1996 » Mon Apr 25, 2011 12:09 am

I'll try that nick, and JSR TO THE RESCUE! Wait...washers can make a valve airtight?And I searched Google first XD
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