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Posted: Fri Feb 03, 2012 5:27 pm
by urgle the danish cow
wyz2285 wrote:The sealing came from a co2 pin valve pin, about epoxy I used one with 360 bar rated.
so like the sealing face from a manufactured co2 gun? do you know the material?
also are your "valve pins" from a blowgun?
Posted: Fri Feb 03, 2012 5:52 pm
by Gippeto
Uh huh.
Did you calculate what the fail pressure would be?
Edit: urgle...most co2 guns use urethane for seals.
Posted: Fri Feb 03, 2012 10:05 pm
by inonickname
Gippeto knows what he's talking about.
Pressure test it if you want to actually be safe.
And by pressure test, I don't mean pump it up to 300 psi below the working pressure. I mean test it hydrostatically with a safety margin.
And trust me, it can fail.
Posted: Sat Feb 04, 2012 12:44 am
by urgle the danish cow
Danke Gippeto
Posted: Sat Feb 04, 2012 6:36 am
by wyz2285
And trust me, it can fail.
nobody said anything about Gun Freak´s gun...
Posted: Sat Feb 04, 2012 7:36 am
by dahakka
may be you should use some screws
Posted: Sat Feb 04, 2012 8:53 am
by Gun Freak
My gun is held together by threaded fittings and carefully soldered joints and has a valve that has held 2,000 psi over night by another member here.
Posted: Sat Feb 04, 2012 11:10 am
by Lockednloaded
Gun Freak wrote:My gun is held together by threaded fittings and carefully soldered joints and has a valve that has held 2,000 psi over night by another member here.
3000 actually
Posted: Sat Feb 04, 2012 12:40 pm
by Gun Freak
Gahh I didn't want to say 3000 and be wrong!!!
Posted: Sat Feb 04, 2012 1:39 pm
by wyz2285
I belive my epoxy will hold more than your tin weld, it´s 3cm of epoxy in a 1cm2 area to hold only 70 bar...
Posted: Sat Feb 04, 2012 6:58 pm
by Gun Freak
I believe that is irrelevant because I only plan on using 400 psi
Posted: Mon Feb 13, 2012 9:02 pm
by Goats spudz
Do you think Argon would be a suitable propellant gas?
Posted: Tue Feb 14, 2012 2:35 am
by jackssmirkingrevenge
Goats spudz wrote:Do you think Argon would be a suitable propellant gas?
It's denser than air so that will mean less performance for a given pressure than if you were using air or nitrogen, but it's less dense than CO<sub>2</s>.
Posted: Tue Feb 14, 2012 8:45 am
by Goats spudz
I think ill use Nitrogen then, thanks
Posted: Wed Feb 15, 2012 2:30 pm
by wyz2285
Some updates:
My epoxy leaked
(plz don´t laugh at me), and I know it´s almost impossible to repair it (unless take the valve off, clean the epoxy and glue it again).
So I made a kind crazy decision: make my own valve, with o-ring seal. The advantage is obvious, I can fix the valve on the chamber with screws and when I have to repair the valve, I just have to unscrew it. Well, I made the valve out off nylon, because I don´t have a metal lathe, only my drill press.
Anyway, I made it
, with 2 o-rings(still need to make the internals). Now I won´t be using 1000 psi, only 60 bar. The area is about 3.33 cm2, at 60 bar it will be 200.4 kg. I´m not worried about the valve blow up, but the screw part, where shout I place the screws?