Anson's AF-36C & AF-51C Cryogenic Ball Valve passes BS 6364 Cryogenic Testing This testing requires immersion in liquid nitrogen @-321F for one hour, then (20) cycles at full rated pressure (2000 psig) with helium as a test gas, then valve is tested for both external & across-valve leakage with helium.

http://www.ansonflow.com/products/af36c.htm

AF-36C Class 800 3-pc Cryogenic Direct Mount Ball Valve

http://www.ansonflow.com/products/af51c.htm

AF-51C Class 150 2-pc Cryogenic Flanged Direct Mount Ball Valve

http://www.ansonflow.com/products/af51c.htm

AF-53C DIN PN16 2-pc Cryogenic Flanged Direct Mount Ball Valve

Please contact Anson for details.