At present, LNG valve technology is in a period of rapid growth, and in the process of rapid development of the LNG industry, the demand for its supporting low temperature valves is increasing. Because LNG has the significant characteristics of flammable and explosive ultra-low temperature, and LNG plants are usually located in the salt spray environment on the sea, its quality directly affects whether the equipment can operate safely, so the selection and design of low-temperature valves are put forward higher requirements.

Liquefied natural gas (LNG) is easier to transport and store than gaseous natural gas. Natural gas at low temperatures (as low as -160° C) Liquefaction into liquefied natural gas (LNG). Cryogenic valves are valves that are used in polar climates or exposed to gas rapid depressors. Usually, when designing such cryogenic valves, it is necessary to consider whether they can operate normally under freezing conditions. Ultra-low temperature top valves are commonly used in liquefied gas conditions, such as LNG, which require operation at extremely low temperatures. Double seat ultra-low temperature top valves require a special seat design to ensure that the central cavity can be relieved and ensure good downstream sealing performance.