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 Post subject: 22xx hpa fitting
PostPosted: Tue Mar 07, 2017 2:09 pm 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
Can someone tell me if a small hpa 90* fitting 1/8" npt will fit inside the 22xx tube?
I want to thread the end of my valve then turn the outlet down through the bottom of the tube. Same idea as a dummy CO2 hpa adapter but threaded not compressed to seal.

Cheers

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 Post subject: Re: 22xx hpa fitting
PostPosted: Tue Mar 07, 2017 7:04 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
I have never seen a small enough 90* fitting.... but you could make one.... or simply make a new front end for the valve and then drill and tap a side hole into it, similar to the way a gauge port works....

Image

This was a valve extension to cover the roll stamp in a 22XX tube in a PCP conversion.... Yours would just be dead-ended in front of the pipe fitting, where the O-rings are.... no seal to the tube required....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 22xx hpa fitting
PostPosted: Tue Mar 07, 2017 9:17 pm 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
Bob,

Yes that's much better then a nipple and 90*.
I don't have a lathe nor the experience to make that piece.
Do you know anyone that makes this item to sell.

Cheers

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 Post subject: Re: 22xx hpa fitting
PostPosted: Tue Mar 07, 2017 11:53 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
Sorry, no.... maybe PM Gippeto?....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 22xx hpa fitting
PostPosted: Wed Mar 08, 2017 6:14 am 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
I was thinking last night and I figure I can use a fake CO2 cart, trim,drill and thread the end 1/8" NPT.Do the same to the valve and put together with a 1/8" NPT by suitable length hydraulic nipple.
Should be solid and fit well.Maybe I could use a solid rod and do the same just drill the side outlet and thread 1/8" NPT.
Any Ideas on suitable rod material for something like this?? (HPA 1100psi)

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 Post subject: Re: 22xx hpa fitting
PostPosted: Wed Mar 08, 2017 2:27 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
Yes, you could use a solid rod, drill and tap one end 1/8" NPT , drill and tap the front of the valve 1/8" NPT, and use a steel HEX nipple to join them (do NOT use a thinwall brass plumbing nipple).... Then drill and tap one side of the rod for a Foster QD fitting to attach your line to.... A simple piece of 3/4" OD 6061-T6 (or 2024-T3) aluminum turned down a few thou to fit inside the tube would suffice.... Drilling two intersecting 11/32 holes to be tapped, in a 3/4" OD bar, will give you plenty of wall thickness for thread engagement, providing you tap them both deeply enough....

CO2 cartridges are much too thin to just tap the wall for a pipe nipple, but I think you knew that.... so it the side of the valve itself (but the end is fine).... I just ran the hose out the end of the tube for a temporary setup....

Image

Image

The female Foster will slide inside a 22XX tube, which makes it super easy, except you can't remove it once inside the tube.... If you shorten the tube flush with the front of the valve, then you can remove it, of course....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 22xx hpa fitting
PostPosted: Wed Mar 08, 2017 5:22 pm 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
Bob,

What's the FPS with that setup?
Regulator pressure?

Cheers and thanks for all the info.


Tazz

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 Post subject: Re: 22xx hpa fitting
PostPosted: Wed Mar 08, 2017 11:21 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
I happen to have that exact information.... The gun was not regulated, I just used the valve to fill to the test pressure I wanted.... That was a stock 2240 valve and transfer port....

Image

It was a test bed to find out how the velocity changed with three different hammer springs, at a variety of pressures, with two barrel lengths.... All the data is condensed into the graph above.... The Disco spring used was the original one, not the new stiffer one supplied today.... You will note that the three springs each have their own maximum velocity point, about 200 psi apart (1200, 1400 & 1600 fps).... and that doesn't change with barrel length.... You will also observe that at all pressures tested, the 24" barrel produced more velocity than the 14", by 50-100 fps....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Profile  
 
 Post subject: Re: 22xx hpa fitting
PostPosted: Thu Mar 09, 2017 5:57 pm 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
Bob,
Thanks for all the info.
You are a time saver.

Cheers

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 Post subject: Re: 22xx hpa fitting
PostPosted: Thu Mar 16, 2017 8:22 am 
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Joined: Mon Aug 08, 2016 7:23 am
Posts: 2839
Location: Somewheres near the Atlantic
Thanks for the graph Bob. The HPA 2260 I just built with a 14.5" barrel got around the same numbers @ 1000 PSI. 560-580 FPS with 14.3 using a PA.


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 Post subject: Re: 22xx hpa fitting
PostPosted: Thu Mar 16, 2017 11:47 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
As you can see from the graph, if you are using a 2240 spring, you can gain a bit by either increasing the spring preload a bit, or substituting a 13XX spring.... That should put you just over 600 fps at 1000 psi with a 14.5" barrel.... but it will use a bit more air.... Using a Disco spring would not increase the velocity further, but would likely waste air....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
 Post subject: Re: 22xx hpa fitting
PostPosted: Fri Mar 17, 2017 9:51 am 
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Joined: Mon Aug 08, 2016 7:23 am
Posts: 2839
Location: Somewheres near the Atlantic
rsterne wrote:
Yes, you could use a solid rod, drill and tap one end 1/8" NPT , drill and tap the front of the valve 1/8" NPT, and use a steel HEX nipple to join them (do NOT use a thinwall brass plumbing nipple).... Then drill and tap one side of the rod for a Foster QD fitting to attach your line to.... A simple piece of 3/4" OD 6061-T6 (or 2024-T3) aluminum turned down a few thou to fit inside the tube would suffice.... Drilling two intersecting 11/32 holes to be tapped, in a 3/4" OD bar, will give you plenty of wall thickness for thread engagement, providing you tap them both deeply enough....

CO2 cartridges are much too thin to just tap the wall for a pipe nipple, but I think you knew that.... so it the side of the valve itself (but the end is fine).... I just ran the hose out the end of the tube for a temporary setup....

Image

Image

The female Foster will slide inside a 22XX tube, which makes it super easy, except you can't remove it once inside the tube.... If you shorten the tube flush with the front of the valve, then you can remove it, of course....

Bob


Im tired of chasing leaks, so I was thinking using your temp setup. How hard is it to setup the spring seat? Also stronger then the tube.


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 Post subject: Re: 22xx hpa fitting
PostPosted: Fri Mar 17, 2017 10:41 am 
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Joined: Tue Jul 22, 2014 5:25 am
Posts: 366
Location: Canada
I agree no leaks,strong and safe. This is the route I'm taking too.

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 Post subject: Re: 22xx hpa fitting
PostPosted: Fri Mar 17, 2017 10:44 am 
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Joined: Mon Aug 08, 2016 7:23 am
Posts: 2839
Location: Somewheres near the Atlantic
tazz wrote:
I agree no leaks,strong and safe. This is the route I'm taking too.


Yeah Im chasing leaks with my disco/2240 valve and my fill assembly.


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 Post subject: Re: 22xx hpa fitting
PostPosted: Fri Mar 17, 2017 10:47 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8997
Location: Coalmont BC
Once you thread in the male Foster into the front of the valve, you measure the distance from the Foster to the original spring seat, and make up a hollowspacer.... Alternately, find a longer spring....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
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