Tuning RTI Prophet external reg dumping air in the cold

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ceyik51533gu

Member
Nov 6, 2020
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MA, Belize
I'm having a few problems with the external regulator.

Whenever the temperature is lower than ~10 degree Celsius I'm unable to fill the tank without the 500cc bottle dumping all the air through the fill hose when I open the bleed valve. 

Once the gun and regulator warm up to room temperature I'm able to open the bleed valve on the main fill tank normally and vent the air left in the hose.

Anyone have any ideas or ever heard of something like this?



EDIT: The tilde is confusing people: ~10 degree Celsius means approximately +10 degree Celsius or +50 Fahrenheit
 
#1 only fill with appropriate room temperatures.

#2 sounds like the fill check valve too cold? Or maybe not bleeding your tank nut quick enough when cold?

#3 have a rubber mallet ready next time and bang it hard to force the valve closed to avoid total leak.
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#1 heating up a gun for an hour after every tank doesn't seem like a long term solution 

#2 I have tried varying the speeds at which I open the bleed valve, it hasn't has an effect so far. I've seen bleed valves that are button releases but I'd rather figure out what is wrong with the regulator.

#3 I think I'm going to try to avoid hammering on the cold piece of metal that connects 500cc's of high pressure air to my gun. 
 
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Man, we got a bunch of whimps here,, lol. 10°F is no problem. They practice Biathlon below 0°F. Hey, if the sun is out and you're dressed properly, its not windy, 10°F is nice, crisp, beautiful weather. I've got a tan/burn at 10°...

"o-rings to hard at 10°F"..??? Tell that to my sleds that have o-rings everywhere, even the heads are o-ringed and its been out at 15° below 0... O-ring are fine at low temps, especially all the exotic ones used/talked about on here...

Like i said above, my bet, its probably moisture freezing up in the check valve. All it takes is a drop to freeze/seize it up. Cold weather by itself, won't seize it up, as same fittings/check valves have been used below 0°F in heavy equipment hydraulics for many decades... Its Water. Take off/apart the tank/check valve and blow/clean it out, maybe with some brake clean to displace moisture. a very very thin coat of Alphabet org synthetic(half a small drop) on/in the check valve to displace moisture... Bet it'll never happen again if you continue to use dry dry air.
 
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Maybe just a drop of moisture freezing in check valve,?
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It's possible but the problem has persisted for a few weeks, the cold temps and low humidity lead me to believe it would be pretty dry as the gun is stored room temp for at least 12 hours before I go to the range. 
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Doesn't matter how the gun is stored, matters what was in the air you filled it with. The cheap YH type compressors are notorious for introducing moisture unless you have the right perfectly maintained filters/driers, and even then its very hard for any drier to separate all water vapor, that's why expensive scuba/scba compressors have condenser coils to cool the discharge air so the vapor condenses to moisture then the filters/driers can easily remove the moisture/liquid...

At 10°F taken from the house to your car back seat/trunk, gun is starting to get cold. Once outside at the range in 10°F ambient temps, the whole gun is way below freezing in probably a matter of minutes, just like that 1/4drop of frozen moisture seizing up your check valve...
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There is a big difference in what an oring experiences in an air vessel compared to hydraulics or a sled at low temps. Big difference. With every shot his gun and components get colder and colder. We all know what it feels like when we degas our guns in our house. Your cure is worth a shot if he wants to continue his range work in freezing temps. I won’t do range work with my powder burners in those temp because of the pressure changes. Not a wimp, just smart.
 
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My bad. I thought -10C was +10F. Thought the difference was 20 degrees.
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Ya, me and you both.

Still confused what the temp is we are talking about, as op in first post said -10c, and has posted 10 without F or C in the sixth post of this thread but seems like he was referring to F temps in his quote of another poster.?

Not sure why we even have any reference to C° as op is from Massachusetts in his profile..?



To op, if temps are above freezing, disregard what I said above since it won't apply
 
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I shoot year round up here in the great white north. Yesterday was 32*F , right at the freezing point. Shot three magazines before going out fo a hunt , had zero issues . This was with the Evanix air speed in .25. Today was 14*F and was using the PP750 ,I put close to 80 shots through the gun and again had zero issues. Here’s a chart I found online. Most orings should do just fine in below freezing temps. 

As far as powder burners go again , no problems with the guns . Any changes will be with the optics. That’s why military recommend open sights in freezing temps. 

5E83E753-1DC6-40D5-A7BD-6A6A575F10BB.1608686803.jpeg

 
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I was going to test lubed pellets out of my Orion BP Mini tonight so I also took this topic into consideration when I did. The gun is Lane regulated and very stable with the SSG. Gun at 68 degrees: 885,884,885,885. While outside changing target, filling feeders and burning cardboard, I let the gun sit in 34 degree temps for 45 minutes. Cold gun chrony: 881, 879,879,878,880. That velocity drop is nothing. Don’t know what will happen at 20 degrees but I do know that when I sat my gun outside it had 200b in it. When I brought it in, it was at 170ish. I know the OP has left the building but this is still interesting stuff.
 
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