Susan,

We have encountered the exact same problem. Even though some of the parts 
comprizing the EPC (Electronic Pressure Control) module have part numbers, 
Agilent will not sell them individually citing as the reason that they 
must be assembled under clean-room conditions. If anyone does find a 
source for these valves, I too would be most interested.

Rich Berger
Washington University Medical School

On Wed, 10 May 2006 11:26:24 -0500, Susan Ziegler <[log in to unmask]> wrote:

>Thanks to everyone for their suggestions on our fractionation issue.
>It was much appreciated.
>
>It turns out that I have a leaking split/splitless on/off valve in
>the injector system. I have removed the valve in question and purged
>it with compressed air, taken it apart and cleaned it.  After that
>the leak was diminished but subsequently returned within 6 hours. In
>the past toggling the valve between split and splitless would fix the
>leak found in splitless mode and to prevent such leaking toggling
>every few days did the trick.  So this valve leaves much to be desired!
>
>I am using an HP6890 (about 6 years old) and have just found out that
>I cannot purchase a new s/sl onoff valve through Agilent Technologies
>(the company that now makes the HP instruments) and instead have to
>purchase an entire manifold that the valve is mounted onto at a cost
>of $2300 USD.  Does anyone know where I might be able to find a new s/
>sl on/off valve (PN G1544-60710) for the 6890 split/splitless
>injector?  This is apparently an inherent problem with these
>injectors so I would really like to find out if there is an
>alternative to buying the very expensive manifold every time the
>valve fails.
>
>Thanks again for the input.
>
>All the best,
>Sue
>
>
>Susan Ziegler
>Associate Professor
>Department of Biological Sciences
>University of Arkansas
>Fayetteville, AR  72701
>479.575.6944 (lab 6342)
>479.575.4010 (fax)
>http://www.uark.edu/~susanz/