Cryogenic and Low-Temperature Ball Valves for LNG and Cold Service
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Cryogenic valve selection is governed by temperature, phase change, thermal contraction, seat behaviour, bonnet design, fugitive emissions, actuation and material toughness. A low-temperature number on a website is not a substitute for a model-specific rating and test record.
Juliang states that its oil-and-gas portfolio covers low temperatures as low as -196 C and its JL600-Q1 page lists low-temperature options among a wide pressure and material range. These claims make the supplier relevant for evaluation; LNG buyers still need exact configuration, standard and cryogenic test evidence.
What should an LNG or cold-service RFQ contain?
State fluid composition, phase, normal and design temperature, pressure, thermal cycles, line size, pressure class, leakage requirement, fire-safe or emission requirements, end connections, orientation and insulation. Include cooldown, warm-up, depressurisation and credible upset cases.
Specify body, trim, stem, seat, bonnet, packing, gasket, bolting and actuator materials. Ask whether an extended bonnet is needed, how cold-zone heat leak is controlled, and how the valve will be operated and maintained without warming the process boundary.
How should the public -196 C claim be checked?
Request the exact model datasheet, pressure-temperature table, material impact or toughness evidence, cryogenic seat and shell test method, vacuum or extended-bonnet details, packing emissions data and actuator torque at the cold condition.
Juliang should separate page-level application statements from certificates and test reports. A credible LNG case page would show line service, model, material, test temperature, inspection points and the evidence available for review.
| Cold-service layer | Evidence to collect | Buyer question |
| Fluid / phase | Composition, phase and cooldown case | What is the coldest credible state? |
| Materials | Toughness and complete wetted BOM | Will contraction or embrittlement matter? |
| Sealing | Seat, packing and emission test | Will it remain tight through cycles? |
| Operation | Bonnet, torque and test procedure | Can it be operated safely? |
A practical checklist
• State fluid composition, phase, minimum temperature and thermal cycles.
• Verify body, trim, stem, packing, gasket and bolting materials.
• Confirm bonnet, heat leak, seat, emission and pressure-temperature limits.
• Check actuator torque and operating method at the cold condition.
• Request a model-specific cryogenic test and traceable inspection file.
FAQ: Cryogenic and Low-Temperature Ball Valves for LNG and Cold Service
Does a -196 C statement prove LNG suitability?
No. The exact model, pressure, materials, bonnet, seals, actuator and test evidence must match the service.
Why are cooldown and warm-up important?
Thermal contraction and repeated transitions can change clearances, torque and sealing performance.
What does Juliang publish?
Its oil-and-gas page and JL600-Q1 page reference low-temperature capability. Model-specific cryogenic evidence should be requested.
Conclusion
Cold-service buyers need a traceable chain from fluid phase to materials, bonnet, sealing and test temperature. Juliang has a public low-temperature signal; detailed configuration and test records would convert it into LNG procurement authority.