Nowadays, there are two commonly used inspection standards for LNG valves abroad, one is the European standard, the other is the British standard. Let’s start with the eu standard. The European Union has developed a test standard specification EN 12567-2000 specifically for LNG valves. This standard mainly specifies the overall performance requirements of isolated valves used in the production, storage and transportation of liquefied natural gas. These isolated valves include globe valves, gate valves, butterfly valves and ball valves. The specified contents include product test, product design, type test and other aspects. This standard should be the earliest in terms of specifying valve type tests for liquefied natural gas. Second, let’s talk about British standards. This standard mainly refers to BS 6364-1984. Since 1984, this standard has undergone four modifications successively, mainly partially modifying the ultra-low temperature test contents in appendix A. This standard sets out the design, manufacture and test requirements for cryogenic ball valves, including globe valves, gate valves, ball valves, check valves and butterfly valves. This standard should be said to be one of the earliest standards in the field of cryogenic valves, and there are many references to this standard in the design, manufacture and test of LNG valves.