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Contents:
Re: cleanable valves ("Mike Sharp")
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Date: Wed, 12 Aug 2009 09:39:39 -0700
From: "Mike Sharp" <rdcpro at hotmail.com>
Subject: Re: cleanable valves
Matt asks for valve help...
Some years ago I worked for a company that manufactures ultra high purity
gas purification equipment. I used tri-clamp fittings everywhere for gas
distribution (upstream of the purifier) and for all the UHP cleaning
connections.
You can machine a three piece ball valve with NPT ends so that it becomes a
"sweat solder" fitting, and then silver solder a regular tri-clamp ferrule
in. Depending on the tube size, the outer part of the threads might still
be showing, but as long as you get a smooth surface on the inner end, you'll
be fine. The solder wicks through, and fills the gap at the inner end of the
ferrule, if you do it right. I also have several 1/2 and 3/4 inch tri-clamp
valves I've bought from ebay, which is a heck of a lot easier than building.
The easiest to clean are the butterfly valves, but ball valves work too.
Frankly, I'm not so sure you'll have to actually disassemble the valve to
clean it, if you recirculate cleaning and sanitizing solution while cycling
the valve a bunch of times.
I've also used a valve with compression fittings on 1 inch ferrules before,
which worked well. I made tons of these.
For bottling, these should probably be dismantled after use, since there is
a small gap in the valve body where the ferrule meets. You can use a Delrin
or Teflon compression ring, which is removable. I imagine you can find
smaller ones that will work on the 1/2 or 3/4 inch tri-clamp ferrules.
Regards,
Mike Sharp
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End of HOMEBREW Digest #5592, 08/12/09
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