Abstract:

Driven by the national energy strategy, LNG terminals will continue to be built and expanded, and the full localization of cryogenic ball valves for LNG terminals has become an urgent demand. Based on the design conditions, operating conditions and medium characteristics of the LNG terminal pipelines, this paper introduces the structural types and technical features of LNG cryogenic ball valves in response to the requirements for valve operational performance and sealing performance. It elaborates on the key technical points of the localization of LNG cryogenic ball valves, including the analysis and calculation of key components as well as the sealing structure, material control, manufacturing and machining, and type test.

Key words: LNG, cryogenic ball valve, valve structur, analysis and calculation, sealing structure, material control, manufacturing and machining, type test