SpudFiles

I found 2 1/2" THIN steel pipes, the 1st is 1m, and the 2nd
is 90cm, I can't screw it, I want to use the 90cm one as a chamber, and the
1m one as a barrel, I think it will be powerful.
but i need any idea how to connect it to the valve, so.., any ideas?

Weld/braze the pipe to a pipe fitting.

Gippeto wrote:Weld/braze the pipe to a pipe fitting.

Is it ok to braze it right into the valve?

elad311 wrote:

Gippeto wrote:Weld/braze the pipe to a pipe fitting.

Is it ok to braze it right into the valve?

Depends a lot on what kind of valve it is. A ball valve might be able to handle steel welding/brazing temperatures, then again it might not. Any valve with a rubber or teflon seal or diaphram won't take the heat needed to weld/braze steel. (Some metal valves designed to be welded can be disassembled and the temperture sensitive parts removed for welding.)

Ball valves for copper water supply systems often have a teflon seal. They'll handle copper soldering temperatures, but that temp is a lot lower than welding/brazing temperatures used for steel.

So, weld a threaded fitting to the pipe then use a threaded valve.

You probably should do some research on the pipe to figure out its pressure rating. You don't say what kind of gun it is; for a generic combustion almost any metal pipe should be OK. If you're talking about a 10X hybrid then you really need to know the characteristics of the pipe you're using.

jimmy101 wrote: Depends a lot on what kind of valve it is. A ball valve might be able to handle steel welding/brazing temperatures, then again it might not. Any valve with a rubber or teflon seal or diaphram won't take the heat needed to weld/braze steel. (Some metal valves designed to be welded can be disassembled and the temperture sensitive parts removed for welding.)

Ball valves for copper water supply systems often have a teflon seal. They'll handle copper soldering temperatures, but that temp is a lot lower than welding/brazing temperatures used for steel.

So, weld a threaded fitting to the pipe then use a threaded valve.

You probably should do some research on the pipe to figure out its pressure rating. You don't say what kind of gun it is; for a generic combustion almost any metal pipe should be OK. If you're talking about a 10X hybrid then you really need to know the characteristics of the pipe you're using.

I just want to build a regular pneumatic..
But the pipe, is thin, some people can bend it..

Being thin and all is there a chance it is galvanized steel, more specifically conduit? In that case be aware of the dangers. I've never brazed galvanized steel, but I know welding on it is worthless.

if you weld a big nut on it you will be able to get it off/on easy.

Don't ever weld a component that has teflon in it...burnt teflon turns into cyanide. I figured out you might want to know this before doing a mistake.

You could also consider using compression fittings or epoxy.