FX Is The Air Marksman Bottle Valve Better Than FX Valve?

[MikeAllen]

I've put the stock FX bottle valve on an aftermarket 300 BAR bottle. After filling and cooling it always seems to loose 30 BAR or so by the next day. Everything is in a temperature controlled environment. Since FX provides a valve meant for 250 BAR and Air Marksman provides a valve for their own 300 BAR bottles, will the Air Marksman hold pressure better? I would think they'd be the same - but maybe not.

 

[Privateer]

Air heats up as you compress it. I'd think that 30 bar is a cooling effect.
Hit it again to top off after a night of cooling. You could put the bottle in a tank of ice while filling but not a good idea when on the rifle!

 

[Peashooter]

Indeed, i fill my 300 BAR 12 L bottle to the + side of 300 BAR, if i then walk away or use the bottle to fill a 300 BAR rifle the day later, well my 300 BAR have cooled down to a lot less pressure, but as privateer say it is quite normal.

If you get a bottle filled in a dive shop i have seen the very same, and even worse as at least here shops are reluctant to fill bottles to 300 BAR.

But as Privateer say, all you can do is to pump the bottle again once it have gotten colder, at least filling ( 180 - 300 BAR ) you can literally feel the 12 L bottle is hot, not cooking of course but no doubt it is hotter than ambient.
After i gotten my own big boy compressor i have to admit the times i have let the bottle cool down and then boosted it again to get it looking more like 300 BAR, well i think that can be counted on 1 maybe 2 fingers.
This might change with my new carbon fiber bottle, as it is after all 3 Liters less volume, but then again being like that it is also faster to top up to the 300 BAR.

 

[Peashooter]

For divers this is a big deal, cuz you can have planned your deep dine with 300 BAR in the bottle, so everything is timed and you have 15 minutes on the bottom.
But if your tank them are just 270 BAR as you start, well the moment you reach the bottom you have to start your way back up.
So divers i recon triple check their tanks before they go down, at least to greater depths where bottom time are then limited.

And if you go really deep and you have several types of " air " with you well then you get to 0 margin for error, cuz trimix as i think its called, there is a reason guys that do that for a living earn so well, one tiny little slip up and you are toast.
At pressures those guys breathe helium as it have other properties at pressure, at the surface you only want to breathe a little of it to get funny voice, you for sure do not want to suck down 100 % helium.

 

[MikeAllen]

As I mentioned I do account for the heating/cooling effect - I give the bottle (500cc) overnight to cool, then top it off again. Still loses about 30 BAR by the next day. Maybe this is just to be expected.

 

[Jay308]

I've put the stock FX bottle valve on an aftermarket 300 BAR bottle. After filling and cooling it always seems to loose 30 BAR or so by the next day. Everything is in a temperature controlled environment. Since FX provides a valve meant for 250 BAR and Air Marksman provides a valve for their own 300 BAR bottles, will the Air Marksman hold pressure better? I would think they'd be the same - but maybe not.

Does the Air Marksman use the same o-ring?

My FX bottle looses 20 bar in 24 hrs too, I fill with a compressor.

 

[Privateer]

IF the FX is rated to 250 bar. I find it a little hard to believe that it would grow a bit at 300 bar and allow a leak.
I'd think maybe a better O-ring may be needed?

 

[MACTEN]

I've put the stock FX bottle valve on an aftermarket 300 BAR bottle. After filling and cooling it always seems to loose 30 BAR or so by the next day. Everything is in a temperature controlled environment. Since FX provides a valve meant for 250 BAR and Air Marksman provides a valve for their own 300 BAR bottles, will the Air Marksman hold pressure better? I would think they'd be the same - but maybe not.

30 seems a bit much.. Is some of this creeping into the reg though? When I go from 135 to 300 on a 580 cc bottle I usually lose about 5-6 bar then top it off the next day. Sometimes I try to get 306 bar in if going that high so it settles at around 300 and I don't have to top it off again.. Also the speed you're getting the air into the bottle is a big reason for the heat. A faster compressor like Yong Heng etc will fill quickly and bring more heat than a slower unit.. My new Maverick came with a 300 bar valve btw.

 

[allinssd]

How fast are you guys filling your bottles?

Maybe I baby my tanks too much, I fill them pretty slow and they don't heat up that much or lose that much on the cooldown.

 

[MikeAllen]

VERRRRY SLOWLLLLLY