Brief Discussion on Special Requirements to Cryogenic Instrument On-off Valves
Since the cryogenic instrument on-off valves operate in extremely cryogenic environment,there are a lot of special requirements in valves manufacture and design process to ensure the functions in cryogenic environment,such as leakage rating of the seat,shell etc.The dedicated cryogenic valve design and manufacture standards and special requirements are analyzed from aspects of valve type selection,valve installation,ball valve design,disk valve structure,etc.Special requirements of body,trim and the materials,bonnet and packing,cryogenic test,fire proofing,etc are introduced,the special requirements of cryogenic valves in the foreign LNG projects and the manufacture technical characteristics of the cryogenic valve vendors in China are analyzed and compared.The promotion to the quality of the domestic valve vendor is expected,and the nationalization can be greatly accelerated.
cryogenic valvesdedicated standardsbody and trimbonnets and packingscryogenic testfire proofingnationalization
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