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Help with Hubb's 2in valve...how does it work??

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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Help with Hubb's 2in valve...how does it work??

Unread postAuthor: caspar97 » Tue Jun 15, 2010 7:23 pm

I know how to build it, but it would be very nice to understand how it works. :D
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Unread postAuthor: Hubb » Tue Jun 15, 2010 7:37 pm

Are you talking about the piston valve? It is just the piston. I left the housing up to the builder.

Piston Valves Explained Visually is the best thread on how they work.
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Unread postAuthor: Technician1002 » Tue Jun 15, 2010 7:37 pm

Look in the wiki. There is a section on piston valves.
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Unread postAuthor: BeaverRat » Tue Jun 15, 2010 7:52 pm

The piston works like every other piston, but it has a built in check valve so that when the piston fires, minimal air can escape back out the pilot valve (therby forcing it through the barrel). Basically, on the inside of the coupling, there is a rubber washer that is flat against several small holes. Air can go through one way because the pressure behind the piston pushes away the rubber washer, but when firing, pressure from the other side pushes the rubber and forces it to seal the holes.
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Unread postAuthor: caspar97 » Thu Jun 17, 2010 5:54 pm

Wait, so the diagram on the wiki is just the piston? Is it barrel seal or chamber seal?
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Unread postAuthor: BeaverRat » Thu Jun 17, 2010 6:19 pm

Well, how could you know how to build it if you don't even know what the piston is? :wink:

FYI: it is just the piston as said by Hubb in an earlier response.
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Unread postAuthor: caspar97 » Thu Jun 17, 2010 7:16 pm

I got it now, all i need to know is what size T joint to use
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Unread postAuthor: Gun Freak » Thu Jun 17, 2010 7:34 pm

Hubb's piston is designed for use in 2" piston valves.
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Unread postAuthor: caspar97 » Fri Jun 18, 2010 7:49 am

OK, thanks :D
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