On 10/28/12 10:36 AM, jb-electronics wrote:
Hi folks,
I received my needle valve yesterday and improved my vacuum system. It
works nicely: I can evacuate the system down to about 0.01 mbar and then
use the needle valve to let in well-defined amounts of Neon. I can
easily adjust the pressure inside the system in steps of 0.1mbar which
is more than sufficient. See my current setup here:
http://www.jb-electronics.de/tmp/vacuum_system.jpg
But there are some minor leaks, mainly caused by the rubber hose
connectors that I use: I still have to figure out a proper way to
connect my 8.8mm tubing to the KF16 flange system; right now I am using
an ordinary rubber hose as seen in the picture. Does anyone know how to
build or get a proper pump union? Just like here, but with a flange
adapter:
http://www.teralab.co.uk/Glass_Blowing/Pump_Unions/Pump_Unions_Page1.htm
I do not have a lathe at my disposal. Also, the connection between the
pressure reducer and the needle valve is not optimal. Any suggestions?
Thanks
Jens
Jens,
I think it would be possible to drill the needed hole in the fitting
using a drill press. The o-ring does the sealing work, so the hole does
not have to be perfect. You can make the chamfer with a large
countersink bit.
--
David Forbes, Tucson AZ
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