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Max preassure on "quick connect fittings" and more

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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Max preassure on "quick connect fittings" and more

Unread postAuthor: Tobin » Sun Mar 06, 2011 1:24 pm

Im not very familiar with english so i dont know the name of these parts in english, so i would like to know whats they are called in english... However, this kind of quick connect fittings: http://www.shoplet.com/Dixon-valve-Air- ... DCP21/spdv

How how preassure can those handle, above 40 bar? The other part, that you connect tho this, whats the name of those? And can i buy those threaded connector instead of the ordinary hose-barbs?

My goal is to connect a fridge compressor with a 6mm copper pipe to this kind of "quick connect fitting" i described above. How is your idea to make this?
Sorry if my english is a little bit stupid :geek:
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Unread postAuthor: Gun Freak » Sun Mar 06, 2011 2:11 pm

The brass type of those should have no problem holding 40 bar. However, they will be absolutely impossible to disconnect or connect to it's female counterpart at that pressure. You would need to use some kind of vent valve in order to disconnect it.
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Unread postAuthor: saefroch » Sun Mar 06, 2011 2:19 pm

You're looking at the male fitting there, and what they connect to is a female quick connect or quick disconnect hose fitting. You can certainly use those with threads on them if you have a female threaded connection to attach them to. Those should handle 40 bar fine. I've used similar fittings to about 70 bar, no problem.

Your english is perfectly fine. :)
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Unread postAuthor: Gippeto » Sun Mar 06, 2011 3:13 pm

Air compressor fittings are typically rated up to 300psi...depending on manufacturer...some are as low as 125psi.

Foster fittings for use on paintball guns or pcp airguns are rated for MUCH higher pressure, are NOT expensive and are readily available.

Is there ANY GOOD reason to NOT be using them? :roll:

http://cgi.ebay.ca/New-Coil-Remote-Hose ... 2a0bba1731

http://cgi.ebay.ca/PAINTBALL-QUICK-DISC ... 2a0bc48c2f
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Unread postAuthor: omniscient » Sun Mar 06, 2011 4:07 pm

There is no way that I'd trust that (Dixon) type of quick-disconnect fitting at 40bar, let alone 70 bar.
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Unread postAuthor: Tobin » Sun Mar 06, 2011 4:44 pm

Gippeto wrote:Air compressor fittings are typically rated up to 300psi...depending on manufacturer...some are as low as 125psi.

Foster fittings for use on paintball guns or pcp airguns are rated for MUCH higher pressure, are NOT expensive and are readily available.

Is there ANY GOOD reason to NOT be using them? :roll:

http://cgi.ebay.ca/New-Coil-Remote-Hose ... 2a0bba1731

http://cgi.ebay.ca/PAINTBALL-QUICK-DISC ... 2a0bc48c2f


The hose and fittings in the upper link is perfect, guess there is threads in the black tube the gauge is placed on?

Now the hard work is to find a 6mm commpresion fitting-thread fitting here in sweden. Or maybe solder a copper fittings first? But then i need a copper 6mm fitting and that doesn't seems available here in sweden either. :(
But will a 6mm commpresion fitting handle 40 bar?? Or how can i connect some kind of fitting on the 6mm outlet on a way that will withstand the pressure?
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Unread postAuthor: Gippeto » Sun Mar 06, 2011 6:49 pm

how can i connect some kind of fitting on the 6mm outlet on a way that will withstand the pressure?


Silver solder (braze) a brass fitting to the tube. It'll gap fill somewhat...better fitting is...better. :)

Get the brass fitting from a hydraulic shop....don't use fittings made for low pressure applications. Look for a "heavy" wall on the fittings.

No worrys about anealing the copper tubing as it's already in an anealed state.

Brazing a compression/pipe thread fitting and then using pipe thread from there would be my first choice.

Something like this...and just braze it on.

http://www.swagelok.com/search/find_pro ... d3fd3672c3
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Unread postAuthor: Gun Freak » Sun Mar 06, 2011 6:50 pm

A compression fitting will be fine at that pressure.
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Unread postAuthor: Gippeto » Sun Mar 06, 2011 7:02 pm

Gun Freak wrote:A compression fitting will be fine at that pressure.


Got a link to a rating? Like to see it. :)
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Unread postAuthor: Gun Freak » Sun Mar 06, 2011 7:20 pm

I've seen copper cannons with compression fittings that used that much pressure...
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Unread postAuthor: Gippeto » Sun Mar 06, 2011 7:39 pm

No worrys...I'll supply the link and rating.... :wink:

http://www.swagelok.com/downloads/webca ... 01-140.pdf

Pg 9

Seems the fitting is rated to 3200psi. :)
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Unread postAuthor: Tobin » Mon Mar 07, 2011 1:42 pm

Thanks guys :wave:
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