Airgun Technologies Uragan 3 compact .22 - adjustment

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BumperMan

BumperMan

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Nov 20, 2023
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Hello everyone
Is it possible to get a faster closing of the valve during the shot by adjusting the U3?
The screw from the valve seat allows for adjustment? Is it just screwed in or not?
I wonder if the only way to shorten the shooting cycle and reduce the dose of ejected air is to use a weaker spring...
The original spring, regardless of the regulator pressure, always gives me too high doses of air that are wasted.
 
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If the design is the same as the U2 you can adjust the hammer, but the diffference is almost none. Its a balanced valve therefor there is not much you can adjust on the valve side. The adjustment should be done on the regulator side.

My U2 is quite efficient, I'm shooting 25,5gr slugs at 57ft.lbs (1000fps) and if I start from 300bar I get over 5 magazines (60+) before falling from regulator.

Are you having low numbers?
 
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BumperMan said:
Hello everyone
Is it possible to get a faster closing of the valve during the shot by adjusting the U3?
The screw from the valve seat allows for adjustment? Is it just screwed in or not?
I wonder if the only way to shorten the shooting cycle and reduce the dose of ejected air is to use a weaker spring...
The original spring, regardless of the regulator pressure, always gives me too high doses of air that are wasted.
Click to expand...
You can adjust the valve up and down, I would suggest unscrewing the valve by about 1/4 turn and see what it does. I did that to my U2 .22 700mm and it dampened the loud ping as well as tightened my spread and grouping. Also, some of us have had to carve into the stock form the inside to be able to unscrew the hammer spring enough to make a difference and not waste air.
 
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JaceSpace Thank you for the hint.
So the U3 is built differently than the U2 and it is a classic valve that has a spring that closes it.
He is quite picky about adjusting the hammer spring and it must be done quite precisely. When it is loosely screwed in, the gun is unstable. But today I achieved a satisfactory result. I have 890fps on jsb monster light. That's about 50 joules and about 50 shots.
I will continue to experiment to get the best results.
At the moment, the regulator is set to about 130bar
 
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I didn’t adjust mine (600mm) as to the valve, only hammer. Meanwhile also upped the reg and rebalanced the hammer, the two strings are with 22gr before and after retune. Even tighter with 18gr. Balancing the valve perfectly would probably help even more but not going to mess with it until I know exactly how it works… Said differently, keep us posted as to valve experiments please:)

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BumperMan said:
JaceSpace Thank you for the hint.
So the U3 is built differently than the U2 and it is a classic valve that has a spring that closes it.
He is quite picky about adjusting the hammer spring and it must be done quite precisely. When it is loosely screwed in, the gun is unstable. But today I achieved a satisfactory result. I have 890fps on jsb monster light. That's about 50 joules and about 50 shots.
I will continue to experiment to get the best results.
At the moment, the regulator is set to about 130bar
Click to expand...
I don't know that it has a classic valve. I believe that it still has the balanced valve that the U2 has. But it can be adjusted.

Hold on you're only getting fifty shots, at 42fpe? Which rifle do you have? My U2 from factory shot 25gr slugs between 935 and 950fps. From 300b to 130b I would get about 140 shors per fill.
 
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JaceSpace1369 said:
I don't know that it has a classic valve. I believe that it still has the balanced valve that the U2 has. But it can be adjusted.

Hold on you're only getting fifty shots, at 42fpe? Which rifle do you have? My U2 from factory shot 25gr slugs between 935 and 950fps. From 300b to 130b I would get about 140 shors per fill.
Click to expand...
I didn’t actually look at the valve but it acts like a traditional. 100s of fps just by way of adjusting hammer… maybe just coincidence but it really reacts to hammer very sensitive, way more than I’d expect from a balanced valve.
 
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greenbeans said:
I didn’t actually look at the valve but it acts like a traditional. 100s of fps just by way of adjusting hammer… maybe just coincidence but it really reacts to hammer very sensitive, way more than I’d expect from a balanced valve.
Click to expand...
I'm gonna make the assumption that the sensitivity is going to depend on where that valve is set. Hammer adjustment didn't too much for my .22 700mm in terms of tuning. Sure it increased and decreased the fps by over 100fps but that didn't make it a good tune. I had to actually adjust the valve.

I don't have a whole lot of knowledge on balanced valves but this is a good thread to read.

Thread 'Tuning a Balanced Valve — for quieter shots' https://www.airgunnation.com/threads/tuning-a-balanced-valve-for-quieter-shots.1303281/
 
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JaceSpace1369 said:
I'm gonna make the assumption that the sensitivity is going to depend on where that valve is set. Hammer adjustment didn't too much for my .22 700mm in terms of tuning. Sure it increased and decreased the fps by over 100fps but that didn't make it a good tune. I had to actually adjust the valve.

I don't have a whole lot of knowledge on balanced valves but this is a good thread to read.

Thread 'Tuning a Balanced Valve — for quieter shots' https://www.airgunnation.com/threads/tuning-a-balanced-valve-for-quieter-shots.1303281/
Click to expand...
I don’t know man… the other true balanced valve guns I have essentially fallen of a cliff in terms of speed if you go below the point the valve opens properly. Like half a turn -5fps, another half turn -3 fps, another half turn -150fps. The u3 doesn’t do that based on what I’ve seen. Must admit though that i only adjusted hammer twice so far, once when I got it and once when I upped the reg. Maybe I just didn’t go far enough. It is true though that hammer mechanism is pretty much like in the U2, which would speak for balanced valve. But something is definitely different. Time for drawings of the U3 becoming available I guess :)
 
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BumperMan said:
In this thread we are talking about a short u3 with a 400mm barrel. I wrote in the title (compact).
U2 and U3 are completely different valve designs.
For the U3 valve, adjusting the hammer spring gives big differences but resembles krait tuning. Accurate positioning is important.
Click to expand...
My apologies for i'm missing out on you saying that it's a compact. I get that they are different valves, my point was that it is still a balanced valve, even if it works differently from the one in the u2
 
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MJMDP said:
If the design is the same as the U2 you can adjust the hammer, but the diffference is almost none. Its a balanced valve therefor there is not much you can adjust on the valve side. The adjustment should be done on the regulator side.

My U2 is quite efficient, I'm shooting 25,5gr slugs at 57ft.lbs (1000fps) and if I start from 300bar I get over 5 magazines (60+) before falling from regulator.

Are you having low numbers?
Click to expand...
Very helpful, thanks for sharing. I have Vulcan 3, 22 cal, shooting 22 grain slugs. I thought my rifle was using a large amount of air but reading your post I guess that is about normal. Thanks
 
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BumperMan said:
Click to expand...
The stronger spring makes sense and explains why it behaves differently. I like it better, subject to adjustability :)

@JaceSpace1369, I think I now also understand what is going on with the NSA in U2 and the speed. The balanced valve uses the pressure building in the barrel to close, so maybe every now and then there’s one a little more snug in the barrel so that pressure in the barrel builds up faster and closes the valve a bit faster as well so that both effects together give a slower shot. Meaning it’s actually not the rifle being inconsistent, just more sensitive to ammo inconsistencies leading to a bit more effort pushing the down the barrel since the effect “doubles” (not in a linear function of course).
 
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alexvr said:
Very helpful, thanks for sharing. I have Vulcan 3, 22 cal, shooting 22 grain slugs. I thought my rifle was using a large amount of air but reading your post I guess that is about normal. Thanks
Click to expand...
Well, I find this quite ok for ther power generated.
Its not the most efficient gun out there, my GK1 is more eficient, and I'm sure there are others, but its not bad taking into account many other reports I've read and compared.

If I lower the speed to someting like 850fps the amount of shots will rise considerably, and I'm sure there are more expert people out there that could tweak the gun and get an extra 10-20% out of it, but I'm quite happy with the tune right now. Its really quiet for the power and lase acurate to 120yds!
 
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