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 Post subject: Hipac Won't hold air
PostPosted: Sun Apr 28, 2013 4:52 pm 
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Location: Near London Ontario
Hi Folks!

My 2250 hipac is losing air, it won't hold over 500 PSI. I have the disco valve stem in there, and I am suspecting that it's the hipac provided valve seal that the hipac sits on. Air slowly leaks out. This issue has been tackled already, but obviously the disco valve, while it solved the issue for a bit, isn't the complete issue.

I need something else. Someone said icecream carton lid plastic. But I want something that will NOT break for a good long while, as I am spending way more time with this thing apart than together.

Is there a deriline seal out there? Can anyone make me anything that can be guaranteed to hold?

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 Post subject: Re: Hipac Won't hold air
PostPosted: Sun Apr 28, 2013 7:27 pm 
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Location: Central West River Nova Scotia
How tight are you twisting the hi pac on. I hand tighten mine with all my might. Never had a problem. As for a seal, I have used a regular black plumbing washer, turned down using a dremmel and sand paper that lasted more than a year. It was still holding air when I got my extensions and spare seals a few weeks ago, but I changed it anyway. I think I might be losing air after a few week,s with the new seal. I'll be testing it tomorrow. If so, I'll be going back to the plumbing washer. I also made a final stage O-ring for my hill pump from one and it lasted a long time.

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 Post subject: Hipac Won't hold air
PostPosted: Sun Apr 28, 2013 9:38 pm 
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Location: Near London Ontario
Plumbers washers, i will look into it. How thick?

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 6:52 am 
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Location: Central West River Nova Scotia
The flat faucet washer with the hole in it, about 1/8" thick. I just use a dremmel cut off wheel shaft to slide the washer on and as it spins I use sand paper to bring it down to size using calipers or just trial fit it till its the right size. The rubber used in them is made for hot water, and is slightly harder than the ones supplied with the Hi pac. I also made one for the inside of the valve and it,s still in there after more than a year.

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 Post subject: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 8:06 am 
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Thanks Joe, i am gonna do just that. How did you get the one inside the valve to stay put?

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 9:52 am 
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IIRC it's just friction fit.

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 9:00 pm 
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If that doesn't work out for ya... :wink:

Caliper opening is same as the end of my hipac. Shows that the seal will be totally captured by metal...with no where to go. Under testing (2000psi) at the moment, will see if it's still holding tomorrow...I've every reason to believe it will be. :)

Unfortunately, not as "off the shelf" as I had hoped. Had to make a mandrel and turn down the od of the seals.

Al

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 10:14 pm 
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Location: Alberta Canada
Now this way of opening up the CR 22xx valve end will take time but it works. Find a small 1/4" ratchet socket that fits in the opening. With a small brass hammer tap around and around the crimp against the socket with an extension to hang onto. Continue until the next size larger and fit. Eventually you will open the crimp to factory spec for a Delrin or suitable hard seal which can be fitted inside. Then with a socket slightly larger fit over the crimp and tap down, and continue with the next smaller socket. Ensure as your tapping continually rotate the socket. This will slowly close the crimp upon your valve end. Or if you have a lathe just make the appropriate mandrels to do the same.

Or

What I did was used the back end of my 8mm boring bar. Chucked the valve end in the lathe and inserted the bar against the inside of the crimp and by hand rotate the chuck as adding pressure to the inside of the crimp. Opens up very easy, and install a custom made seal. Move the bar end at an angle (45 ish degrees) from the outside of the crimp and turning the chuck by hand, squeeze the edges in. Takes about 20 min including making a new seal.


Oops I bad its a 6mm boring bar. Bad Kim Bad

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Last edited by Whitewolf on Mon Apr 29, 2013 11:42 pm, edited 1 time in total.

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 10:40 pm 
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Location: Victoria, BC and Clarkston, WA
Sounds like a tool I made at work for crimping an encapsulated flared fitting for tubing! Pretty simple when you a huge machine shop at your disposal!

I do have a batch of delrin if someone would give me the exact dimensions for that seal I could make a bunch for $2.00ea.

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Last edited by rrdstarr on Mon Apr 29, 2013 10:46 pm, edited 1 time in total.

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 10:42 pm 
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Hmmm....kinda wish we'd a had this conversation sooner. :lol:

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Not an issue of huge significance in my case as the hipac stays put...fellow could still swage it down with an internally tapered punch, but would have been better to open it as you suggest.

Al


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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 10:58 pm 
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Location: Alberta Canada
0.371 x 0.070 x hole size. :D :D :D

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 11:16 pm 
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Whitewolf wrote:
0.371 x 0.070 x hole size. :D :D :D


Roger that!

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 11:41 pm 
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Location: Coalmont BC
Quote:
I hand tighten mine with all my might.

If you really reef on the HiPac when tightening it, you will be putting a LOT of load on that little 6-40 screw that is holding the valve in place.... Add on the end force from the air pressure, and it could be possible to shear off that screw.... RR recommends on his website replacing the screw with an 8-32.... and he ALSO says don't reef on the HiPac to tighten it....

Delrin, being harder, might even be more difficult to seal, requiring more force?.... Food for thought....

Bob

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 Post subject: Re: Hipac Won't hold air
PostPosted: Mon Apr 29, 2013 11:57 pm 
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Location: Alberta Canada
Delrin, being harder, might even be more difficult to seal, requiring more force?.... Food for thought....

Bob[/quote]


Good point Bob, about the #6-40 screw. I found that with my Hipac (was curious to everyones rave of it) it was just a simple snug upon the delrin and i've never experienced any leak down. Didn't like the so called black seal, looked cheap to me.

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 Post subject: Re: Hipac Won't hold air
PostPosted: Tue Apr 30, 2013 12:44 am 
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How about nylon? Got some of that in the right diameter of .375!

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3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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