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hydraulic fittings

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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hydraulic fittings

Unread postAuthor: RDX, » Wed Jun 20, 2007 3:49 am

have anybody used hydraulic pipe and fittings to make cannon for high pressures . they cost much but I live in Finland and I cant find high pressure fittings for compressed air . hydraulic pressure raiting for those fittings and pipe is over 600bar so do you think that its ok to use them for hybrid or high pressure cannon :D
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Unread postAuthor: Hotwired » Wed Jun 20, 2007 3:53 am

Yes but you're going to have to fork out waaay too much.

They're made to much tighter tolerances than pneumatic fittings and I've heard they have to be because o-rings deform at hydraulic pressure so they can't be used.

Getting pneumatic fittings mailed in from another country would probably be cheaper...
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Unread postAuthor: mark.f » Wed Jun 20, 2007 8:50 am

Not to mention most hydraulic fittings I've seen over in the state are pretty small. You can get bigger ones but they go up in price a lot.

Only hydraulic fittings I've seen that look useful in pneumatic applications would be the double shut-off quick-disconnect couplings. That way, when you disconnect a 50' air hose, it doesn't shoot around smacking things if you don't hold it, like mine does. :P
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Unread postAuthor: spudthug » Wed Jun 20, 2007 9:23 am

Only hydraulic fittings I've seen that look useful in pneumatic applications would be the double shut-off quick-disconnect couplings. That way, when you disconnect a 50' air hose, it doesn't shoot around smacking things if you don't hold it, like mine does.


i have a pair of those (mine are 3/8) and i am trying to find a use for them...any ideas?

as for teh hydraulic fittings..why not order from a online site? so ur saying u have no hardware stores within 20 miles of your house? i would cry...lol...
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Unread postAuthor: Jolly Roger » Mon Jul 02, 2007 8:46 am

Yeah I'm trying to find something along those lines. Does anyone know what hydrualic rams etc. use instead of o-rings?
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Unread postAuthor: Hotwired » Mon Jul 02, 2007 11:01 am

Actually they do use o-rings :oops:

I'ts just that more commonly you'll find they use more complicated non-o-ring seals like these instead.
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Unread postAuthor: Jolly Roger » Mon Jul 02, 2007 11:11 am

Yeah thats what I was reffering to. Cheers. I think I might just stick with the o-rings though, they seem a little too complex. I don't think the o-rings will fail on me if I use them properly. :wink:
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Unread postAuthor: frankrede » Mon Jul 02, 2007 1:56 pm

woot woot nptf threads!
I called a local hydraulic fittings supply and the prices were outrageous they wanted $70 for a 1/4" check valve. Rated to some ungodly high pressure though
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Unread postAuthor: Hotwired » Mon Jul 02, 2007 4:40 pm

Heh

It's like using inch thick steel for your hairspray combustion :P
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Unread postAuthor: frankrede » Tue Jul 03, 2007 12:54 am

Hotwired wrote:Heh

It's like using inch thick steel for your hairspray combustion :P
Haha, I have seen it before!
But with 1/2" aluminum and propane:(
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Unread postAuthor: TwitchTheAussie » Tue Jul 03, 2007 1:13 am

Jolly Roger wrote:Yeah I'm trying to find something along those lines. Does anyone know what hydrualic rams etc. use instead of o-rings?


Where are you from mate? .
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Unread postAuthor: Jolly Roger » Tue Jul 03, 2007 2:37 am

I'm from qld, aus, but I think I might just stick with the o-rings for now anyway.
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Unread postAuthor: WOW!! » Thu Jul 05, 2007 1:51 pm

www.surpluscenter.com has a bunch of stuff and I think they ship over seas.
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