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Help CenterLow Temperature API 6D Duplex Stainless Steel Ball Valve for Cryogenic Service Down to -196°C
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As a leading manufacturer with ISO9001 certified quality management, Shanghai Zhibang Valve is dedicated to engineering robust flow control solutions for the most demanding industrial environments. Our Low Temperature API 6D Duplex Stainless Steel Ball Valve is specifically designed for cryogenic service, reliably operating in extreme conditions down to -196°C. This valve is a critical component for industries handling liquefied gases, ensuring safety, integrity, and long-term performance where failure is not an option. We combine advanced metallurgy with precise manufacturing to deliver a product that meets the stringent requirements of global energy and chemical sectors.
This cryogenic ball valve is engineered to maintain exceptional mechanical properties and corrosion resistance at ultra-low temperatures, preventing brittle fracture and ensuring leak-tight shut-off. The use of Duplex Stainless Steel provides an optimal balance of strength and durability, significantly outperforming standard stainless steels in harsh, sub-zero applications.
- Superior Low-Temperature Toughness: The duplex stainless steel body and components are specially selected and treated to retain high impact strength and prevent cracking at temperatures as low as -196°C, ensuring reliable operation in LNG, liquid nitrogen, and ethylene services.
- Extended Stem Design: A critical feature for cryogenic valves, the extended stem/bonnet design moves the packing and operating mechanism away from the extreme cold zone. This prevents packing freeze-up, ensures easy operation, and protects the actuator in automated systems.
- Advanced Sealing Technology: We offer a range of seat and seal materials, including low-temperature grade PTFE and PEEK, which remain flexible and effective at cryogenic temperatures, providing a bubble-tight seal and long service life.
- API 6D Compliance: Manufactured in accordance with API 6D specification for pipeline valves, ensuring robust design, rigorous testing, and interchangeability for pipeline and process applications.
- Fire-Safe Option: Available with fire-safe design per API 607/6FA standards, providing an additional layer of safety by maintaining a seal even in the event of a fire, a crucial feature for hydrocarbon processing.
- Versatile Actuation: The valve can be supplied with manual lever or gear operation, or fitted with pneumatic or electric actuators for remote control and integration into automated process systems.
Below is a summary of key technical specifications for common configurations:
| Parameter | Specification |
|---|---|
| Design & Test Standard | API 6D, ISO 17292, ASME B16.34 |
| Pressure-Temperature Rating | ASME B16.34, Class 150, 300, 600, 900, 1500 |
| Temperature Range | -196°C to +200°C (depending on seat material) |
| Body Material | Duplex Stainless Steel (UNS S31803/S32205) |
| Trim Material (Ball, Stem) | Duplex Stainless Steel or with special coatings |
| Seat Material (Standard) | PTFE (Cryogenic Grade), Reinforced PTFE, PEEK |
| End Connection | RF Flange, RTJ Flange, Butt Weld, Socket Weld |
| Leakage Class | API 598 / ISO 5208 (Class VI bubble-tight available) |
For clients, the benefits are clear: enhanced safety through reliable performance in critical cryogenic processes, reduced maintenance costs due to the valve's durable construction and corrosion resistance, and operational efficiency from smooth, consistent actuation even after prolonged exposure to extreme cold. Its compliance with international standards like API 6D also simplifies procurement and ensures compatibility with existing global infrastructure.
With an annual export value demonstrating our global reach across North America, Europe, Asia, and beyond, Shanghai Zhibang Valve has built a reputation for delivering dependable industrial valves. Our ISO9001 certification underpins every stage of production, from material sourcing to final testing. We understand the critical nature of cryogenic applications, and our valve is engineered to provide peace of mind. For your next LNG, air separation, or chemical processing project requiring robust low-temperature valving, contact us to discuss your specifications and experience the reliability of a valve built for extreme performance.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of using Duplex Stainless Steel for a cryogenic ball valve?
A1: Duplex Stainless Steel offers an excellent combination of high strength and superior corrosion resistance, which is maintained at cryogenic temperatures. It has much better toughness and resistance to stress corrosion cracking compared to standard austenitic stainless steels like 304 or 316, making it a safer and more durable choice for services down to -196°C.
Q2: Can this valve be used for both on/off and control applications?
A2: Primarily designed as a shut-off valve, it provides excellent on/off service. For precise flow control, it is recommended to pair it with a suitable control actuator and possibly a characterized ball or V-port design, which can be discussed as a customization option.
Q3: Is the extended bonnet necessary, and what are its benefits?
A3: Yes, for cryogenic service, an extended bonnet (or stem) is essential. It elevates the stem packing and operating mechanism to a warmer environment, preventing the packing from freezing solid, ensuring the valve can be operated easily, and protecting actuators from cold damage.
Q4: What types of cryogenic fluids is this valve suitable for?
A4: This valve is suitable for a wide range of liquefied gases and cryogenic fluids, including but not limited to Liquefied Natural Gas (LNG), liquid nitrogen (LIN), liquid oxygen (LOX), liquid argon (LAR), liquid ethylene, and liquid carbon dioxide.
Q5: Are special tests performed on these cryogenic valves?
A5: Yes, in addition to standard shell and seat tests, cryogenic valves often undergo low-temperature seat leakage tests. The valve is cooled with liquid nitrogen or a similar medium to its rated temperature, and seat leakage is measured to ensure a bubble-tight seal under actual operating conditions.
Q6: What actuation options are available?
A6: The valve can be supplied with a manual lever, a gear operator for larger sizes/higher torques, or prepared for the mounting of pneumatic (double-acting or spring-return) and electric actuators. The specific choice depends on your automation requirements and available utilities.
Q7: Do you offer fire-safe versions of this cryogenic valve?
A7: Yes, a fire-safe design is available as an option. This design incorporates secondary metal seals that engage to maintain a seal in the event that the primary soft seats are damaged by fire, complying with standards like API 607 or API 6FA.
Q8: What is your lead time for such specialized valves?
A8: Lead times vary based on size, pressure class, actuation requirements, and order quantity. Standard configurations may have shorter lead times, while fully customized units require more detailed engineering and manufacturing. Please contact us with your specific requirements for an accurate delivery schedule.
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