With the development of petrochemical industry and shale gas industry, especially the wide application of liquefied natural gas (LNG), the requirements for the reliability, adaptability, stability and sealing of ultra-low temperature equipment such as gate valve, check valve and ball valve applied under ultra-low temperature conditions are increasingly high. Generally, the valves applied in the medium temperature below - 40 ℃ are called low-temperature valves, and the valves applied in the medium temperature below - 101 ℃ are called ultra-low-temperature valves.

The ultra-low temperature ball valve is mainly used in the devices of LNG, LPG and air separation industry. The liquid cryogenic medium output includes: liquid oxygen, liquid hydrogen, LNG, liquefied petroleum products, etc. These medium are not only flammable and explosive, but also vaporized when heating up or flashing, and the volume expands rapidly during gasification. If there is a closed valve chamber in the valve conveying these fluids and the structure design is not reasonable, it will cause overpressure in the valve chamber, which will lead to media leakage, and even cause accidents due to valve opening.

LNG seals play an important role in ensuring the reliability and stability of LNG cryogenic equipment. The research and development of low-temperature valve sealing ring is an important guarantee for the application and development of scientific research equipment such as large science and engineering, and has very important scientific and practical significance. At present, the main reference standards for seal design of ultra-low temperature equipment at home and abroad include API-6D-2008 and British BS6364.

JST's spring energized seal is an excellent choice for LNG cryogenic valve sealing.

Advantage

- Very good sealing performance;

- High sealing pressure;

- Bear severe changes in temperature;

- Good sealing ability when the surface is not ideal;

- Easy to install;

- Long life cycle;

Main material:

Imported polymer material. It is reinforced for ultra-low temperature environment, and the lip is specially grinded, making it more wear-resistant and longer in service life.

Spring:

Adopt alloy+special treatment process (reduce metal transformation deformation of metal spring at low temperature, and improve yield strength) The special spring is made of HEATTREATED ELGILOY alloy spring. The combination of different PTFE composite materials, and corrosion-resistant metal springs can fully meet the requirements of the industry.