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A Concise Overview of LNG (Liquefied Natural Gas) Cryogenic Breakaway Valves

2021-08-10

  1. Function

    • Emergency shutdown of pipelines to prevent LNG leakage (e.g., automatic separation and sealing during unexpected tanker movement or hose rupture).

  2. Key Features

    • Temperature: -196°C (liquid nitrogen grade)

    • Pressure: Class 150~600 (PN16~100)

    • Activation Method: Shear-pin type (adjustable tension), spring-energized type

    • Sealing: Bidirectional zero leakage (metal + PTFE seals)

  3. Applications

    • LNG tanker loading/unloading

    • Ship bunkering

    • Storage tank pipeline connections

  4. Selection Criteria

    • Breakaway force (2~10 kN), diameter (DN25~200), material (316L/nickel-based alloy)

  5. Maintenance Requirements

    • Regular inspection of shear pins/springs

    • Annual seal test (helium leak detection)

  6. Representative Brands

    • International: SVT (Germany), OPW (USA)

    • Domestic: Jiangsu Shentong, CNNC SUFA

Core Value: Rapid shutdown under unexpected external forces to ensure the safety of LNG transfer.