Cryogenic and Low-Temperature Ball Valves for LNG and Cold Service

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.

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.