I could certainly be wrong, it's happened once or twice before, but as I
understand it the sleeve is intended to apply even compression to the
flare without twisting it as happens with a single piece nut. Even if
you use a 45 degree flare this arrangement is superior to standard
double flares, but it doesn't really fit the parts, you're relying on
deformation to make it work. At any rate, when you use a 37 degree flare
you're supposed to use these pieces for all pipe connections. there are
one piece 37 degree nuts (I think they're called 817) but they are not
recommended and they are more expensive than the 818/819 combination.
As I recall there are other advantages to 37 degree flares, including a
tendency to stay undeformed after being made up. And the tools are
nicer.
________________________________
From: Fubog1@aol.com [mailto:Fubog1@aol.com]
Sent: Wednesday, January 10, 2007 5:06 AM
To: Bill Babcock; hottr6@hotmail.com; fot@autox.team.net
Subject: Re: [Fot] Source needed for single-flare brake lines
In a message dated 1/9/2007 8:12:00 PM Eastern Standard Time,
BillB@bnj.com writes:
Glen,
the 818 and 819 nuts and sleeves are not meant to adapt 45
degree flares to 37, they are part of a standard 37 degree flare
connection. I'm sure they'd work with a 45 degree, but there's no good
reason to use them that way.
Interesting Bill, it's my understanding that this is the purpose of
using them... that the sleeve compresses/deforms enough to make up the
slight angle difference.
FWIW, this is how I plumb all my systems, been doing it this way for
years, with 0 problems. I use a Blue Point double flare tool (45
degree), & carefully inspect each flare for any slight burr that is
sometimes formed on the OD between the 2 halves of the clamp. This is
easily removed with a hand scraper. They're virtually "bulletproof" in
service, in my experience.
Question- If these are designed to be used on a 37 tube end flare, then
what would be the point of using them to begin with?
Uh oh, I hope this doesn't mean that I have to do a MAJOR recall (:-)!
Thanks for the input,
Glen
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