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Bulkhead Seals

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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Bulkhead Seals

Unread postAuthor: Velocity » Mon May 26, 2008 11:19 pm

There are basically two ways to make a piston removable from the valve. The first is to use a female adapter in conjunction with a male adapter or plug. It is not pretty, but it is cheap and it gets the job done.

The much better way to make a piston removable is to use a bulkhead. The bulkhead, usually constructed from solid plastic or metal, is bolted into place at the back of the piston tee. The one problem with such a method of construction is that the bulkhead usually requires o-rings of some type to seal it.

Does anyone know of a way to get a bulkhead to seal in a pipe/fitting without the use of o-rings, and still allow it to be removable? I have heard that people used Teflon pipe tape, but I cannot imagine such a method having any success. Please do not respond with something like epoxy or hot glue. Thanks
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Unread postAuthor: THUNDERLORD » Tue May 27, 2008 12:02 am

Maybe cut the threads off the male adapter and cut notches into it(so it can be threaded in still).
You'd still probably need a rubber gasket but it could be neoprene or inner-tube. Perhaps thread it in front of the bulk-head then gasket then screws into the bulk-head around OD of T Still like an o-ring though :roll:
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Unread postAuthor: Biopyro » Tue May 27, 2008 3:43 am

I was having the exact same problem here http://www.spudfiles.com/forums/leaky-piston-housing-t14602.html What I've decided to do is just service it through the barrel port and glue it on. I found that a caulk filler made the leak bearable up to around 4 bar, and I suspect that a good silicone sealant would probably solve the problem.
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