ASTM A350 trunnion ball valves Description
A350 trunnion ball valve is a special valve made based on ASTM A350 LF2 low-temperature forged steel valve body, with integrated trunnion fixed ball structure, designed for cryogenic media (-196℃) and high-pressure working conditions. Its core value lies in solving the safe cutoff requirements of ultra-low temperature fluids such as liquefied natural gas (LNG) and liquid hydrogen.
Structural features
Cryogenic reinforced structure
Trunion support: The ball is rigidly fixed by a high-strength alloy trunnion, and there is no shrinkage deformation at a low temperature of -196℃, ensuring stable fit of the sealing surface;
Ultra-low temperature valve seat: Graphite reinforced PTFE or metal bellows seal is used, and the low-temperature shrinkage rate is less than 0.1%, which adapts to the thermal expansion and contraction of cryogenic media.
Safety redundancy design
Fireproof structure: The metal valve seat automatically seals after the soft seal is burned (in accordance with API 607);
Anti-static device: The spring between the ball and the valve stem conducts static electricity, and the resistance is less than 5Ω (ISO 5208 requirements).
Fully forged steel body
Forged according to ASTM A350 LF2, with dense grains and no defects, pressure resistance up to Class 2500 (PN420), and better impact toughness than cast steel.
ASTM A350 trunnion ball valves Specification
Pressure rating: Class 150 to Class 1500 (PN16 to PN250);
Diameter range: DN15 to DN200 (1/2" to 8");
Temperature limit:
Standard working conditions: -196℃ to +200℃ (A350 LF2 material);
High temperature extension: up to +425℃ with special seals;
Connection method: Butt welding (ASME B16.25), socket welding (ASME B16.11).
ASTM A350 trunnion ball valves
Advantages
Deep-cold reliability: -196℃ seal life>100,000 times, no risk of brittle fracture;
High-pressure stability: Trunnion support offsets fluid thrust, and Class 1500 torque is reduced by 30%;
Strong corrosion resistance: LF2 material is resistant to sulfide stress corrosion (NACE MR0175 certification);
Easy maintenance: Modular design of valve seat, supports online replacement.
Applications
Ultra-low temperature energy: LNG storage and transportation (-162℃), liquid hydrogen filling station (-196℃);
High-pressure chemical industry: ethylene cracking unit (-100℃ cryogenic separation);
Special gases: liquid oxygen, liquid nitrogen industrial pipelines;
Aerospace: rocket fuel delivery system.
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