China's first international standard for LNG marine equipment, ISO 21157:2018, Design and Test Requirements for Low Temperature Ball Valves for Ships and Offshore Technologies, ISO 21159:2018, Design and Test Requirements for Low Temperature Butterfly Valves for Ships and Offshore Technologies, November 2018 The official launch of the Standardization Organization (ISO) marks an important breakthrough in the development of international standards for high-tech ships.

Liquefied natural gas (LNG) ships are known as the "crown jewels" of the world's shipbuilding industry and are typical representatives of high-tech, high value-added ships. Cryogenic valves are important piping equipment for liquefied natural gas (LNG) vessels. They are used in ultra-low temperature environments of -196 °C and are essential for the safety of ships, equipment and personnel.

China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, as the domestic technical counterparts and standard editors of the International Organization for Standardization/Ship and Ocean Technology Committee (ISO/TC8), organizes Hudong Zhonghua Shipbuilding (Group) Co., Ltd. and Shanghai Hudong Shipbuilding Valve Co., Ltd. Shuangheng Valve Co., Ltd., Dalian Marine Valve Co., Ltd., Jiangnan Shipbuilding (Group) Co., Ltd. and other units have carried out two international standards preparation work.

ISO 21157:2018 and ISO 21159:2018 stipulate the structure, materials, welding and test requirements of marine ultra-low temperature ball valves and butterfly valves. The standard technical indicators have reached the international advanced level and achieved international leading. It will provide design and test for ultra-low temperature ball valves and butterfly valves. Important technical support.