LNG Cryogenic Liquid Nitrogen Extended Stem Double Ball Ball Valve

Core product positioning

This product is a special valve specially designed for liquefied natural gas (LNG), liquid nitrogen and other cryogenic media. It adopts an ultra-low temperature long-neck valve cover and a unique double-ball double-cut-off relief (DBB) structure, ensuring absolute sealing, safety isolation and automatic pressure relief in the cavity in an extremely low-temperature environment of -196℃. It is a core safety device in the fields of LNG storage and transportation, air separation units and cryogenic chemical industry.

Detailed technical specifications

Main features and advantages

1. Ultra-low temperature long-neck valve cover design

Effective heat insulation: Through the optimized design of the extended valve neck, the temperature at the stuffing box area is ensured to remain above 0℃, preventing operational failures caused by icing or freezing.

Cold insulation structure: The outer surface of the valve cover is equipped with a dedicated insulation fixing ring, which facilitates the construction of the cold insulation layer and maintains the low-temperature performance of the system.

Reliable material: Made of deep drawing formed austenitic stainless steel, it still maintains excellent impact toughness at -196℃.

2. Double-sphere double-truncated relief structure

Double sealing guarantee: Two independent spheres and the valve seat form a series sealing barrier, greatly enhancing the sealing reliability.

Automatic relief function: When the pressure in the middle chamber abnormally rises, it can automatically release the overpressure to ensure the safety of the valve.

Advanced safety level: Meets SIL 3 safety certification requirements, with the failure probability minimized.

3. Specialized cryogenic treatment technology

Material stability: All key components have undergone deep cryogenic treatment at -196℃ to eliminate internal stress and ensure dimensional stability.

Low-temperature sealing materials: Special sealing materials such as reinforced PCTFE are adopted to maintain elasticity and sealing performance under ultra-low temperature conditions.

Precision assembly: Special low-temperature gap compensation design ensures reliable operation even when the temperature changes.

Typical application fields

LNG industry chain: Receiving station loading and unloading arm system, liquefaction plant process pipeline, storage tank inlet and outlet control

Industrial gases: liquid oxygen/liquid nitrogen pipelines for air separation units, liquid storage tank systems, and tank truck loading and unloading systems

Special fields: Superconducting cooling systems, aerospace cryogenic fuel systems, scientific research experimental devices

Value summary

The LNG liquid nitrogen ultra-low temperature long-neck double-ball double-cut-off ball valve, through its innovative double-ball DBB structure, professional ultra-low temperature design and strict cryogenic treatment process, provides the cryogenic industry with:

Outstanding safety performance: Dual sealed barriers and automatic venting function

Reliable ultra-low temperature adaptability: Stable operation in an environment of -196℃

Long-life design: Through rigorous low-temperature cycling tests, the service life has been significantly extended

Perfect standardized certification: Complies with the major international standards for cryogenic valves

This product is an ideal choice for ensuring process safety and reliable operation in liquefied natural gas processing, industrial gas production, and various ultra-low temperature applications. It is particularly suitable for critical working conditions with extremely high requirements for equipment safety and reliability.