Southern California Valve has allot of experience with cryogenic globe or gate valves.
http://www.scvvalve.com/aboutus.html
I would recommend contacting Josh his email is josh@scvvalve.com. They are a great company to work with fair prices and great delivery times.
Inch version above... Metric version herehttp://files.engineering.com/getfile.aspx?folder=277028cc-9bd8-458b-a34f-9c1f68abeacc&file=o_ring_service_4_en.zip
Trelleborg has an Trelleborg has an excellent O-Ring calculator. It is the BEST I have ever seen. It will recommend standard Dash Size O-Rings for your application. It will give you recommended grooves for dynamic or static applications. It tells you thermal expansion and TONS of other...
adamgnt,
I am not sure if you found a solution to this application, but have you considered using a thermoset composite bearing material? I recommend trying “Orkot”. It is a fabric reinforced thermoset composite material. It has a a low coefficient of friction(STATIC CO EFFICIENT OF FRICTION...