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Marine Low Temperature Gate Valve With Extended Bonnet, -196℃ Cryogenic Operation
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Engineered for extreme cold down to -196°C, this marine gate valve features a critical extended bonnet design to prevent stem freeze and ensure reliable operation. Built with certified cryogenic materials per API/ISO standards, it offers bidirectional sealing, optional fire-safe configuration, and is available in various sizes/ratings for LNG carriers and cryogenic processing, ensuring safety and longevity in harsh marine environments.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Material:
Other, Stainless Steel (e.g., CF8, CF8M) or other cryogenic alloys
Application:
Other, Marine
Standard:
Other, API 600, API 602, BS 1873, ISO 15761
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Material
Other, Stainless Steel (e.g., CF8, CF8M) or other cryogenic alloys
Application
Other, Marine
Standard
Other, API 600, API 602, BS 1873, ISO 15761
Operation Temperature
Down to -196°C (-320°F)
Design
Extended bonnet (stem) design
Connection Type
Flanged (RF, RTJ), Butt Weld
Pressure Rating
Class 150, 300, 600, 900, 1500, 2500
Size Range
1/2 inch to 24 inches (DN15 to DN600)
Operation
Manual (handwheel), gear operated, or actuated
Seat & Seal
Soft seat (PTFE) or metal-to-metal
As a specialized manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. leverages our expertise to provide robust and reliable fluid control solutions for demanding environments. Our Marine Low Temperature Gate Valve with Extended Bonnet is engineered specifically to meet the stringent challenges of cryogenic applications, such as LNG (Liquefied Natural Gas) handling, ethylene transport, and other low-temperature processes in marine and offshore settings. This valve is designed to ensure safe, leak-tight isolation even at temperatures as low as -196°C, offering our clients a critical component for their most challenging operations.
This valve is not just a standard gate valve adapted for cold service; it is a purpose-built solution. The core of its design is the extended bonnet, which serves a vital function. In cryogenic service, the stem packing and operating mechanism must be kept at ambient temperatures to prevent freezing, ensure smooth operation, and protect personnel. The extended bonnet creates an insulating air chamber or can be packed with insulating material, effectively isolating the cold fluid from the valve's upper works.
Key Technical Features and Design Advantages:
- Extended Bonnet Design: The elongated neck (bonnet) is the defining feature. It minimizes heat transfer from the cold process fluid to the stem packing and yoke area, preventing ice formation and ensuring the handwheel or actuator remains operable.
- Cryogenic Material Selection: Body and trim materials are specifically chosen for their toughness and ductility at low temperatures to prevent brittle fracture. Common materials include ASTM A351 Gr. CF8 (304SS), CF8M (316SS), CF3M (316L SS), and other austenitic stainless steels or specialized alloys like Monel.
- Specialized Stem & Packing: The stem is often made from a high-strength, low-thermal-conductivity material. The packing system is designed for cryogenic service, typically using flexible graphite or PTFE-based materials that maintain sealing integrity across the extreme temperature range.
- Bidirectional Sealing: Our gate valves provide reliable sealing in both flow directions, a crucial feature for isolation applications in piping systems that may see pressure from either side.
- Fire-Safe Design (Optional): Many models can be configured with fire-safe features per API 607/API 6FA standards, where secondary metal seals engage in the event of a fire, providing an added layer of safety.
Typical Technical Specifications:
| Parameter | Specification / Range |
| Design & Manufacturing Standard | API 600, API 602, BS 1873, ISO 15761 |
| Temperature Range | -196°C to +100°C (-320°F to +212°F) (Standard) |
| Pressure Class | Class 150, 300, 600, 900, 1500, 2500 (ANSI/ASME) |
| Size Range (Nominal) | 1/2" to 24" (DN15 to DN600) |
| End Connection | Flanged (RF, RTJ), Butt Weld, Socket Weld |
| Operation | Manual Handwheel, Gear Operator, Pneumatic/Hydraulic/Electric Actuator |
| Body Material (Typical) | A351 CF8/CF8M, A352 LCB/LCB (for specific low temp), Duplex Stainless Steel |
Benefits for Your Operation:
- Enhanced Safety & Reliability: Prevents stem packing freeze-up, ensuring the valve can be operated in an emergency, which is critical for marine safety protocols.
- Reduced Maintenance: By protecting the stem packing from extreme thermal cycling and moisture ingress, the valve requires less frequent maintenance and repacking.
- Long Service Life: The use of appropriate cryogenic materials and design minimizes thermal stress and wear, extending the valve's operational lifespan in harsh conditions.
- System Integrity: Provides a bubble-tight shut-off for cryogenic liquids, preventing product loss and maintaining system pressure and purity.
- Operational Flexibility: Available in various sizes, pressure ratings, and actuator options, it can be tailored to fit specific system layouts and automation requirements.
Primary Applications:
- LNG Carrier ships (loading/unloading arms, tank connections, process lines).
- Onshore and Floating LNG terminals and regasification plants.
- Marine systems handling liquid nitrogen, oxygen, argon, or ethylene.
- Cryogenic storage tank farms and distribution pipelines.
- Chemical tankers and process ships with low-temperature cargo.
Backed by our ISO9001 certified quality management system, Shanghai Zhibang Valve ensures that every Marine Low Temperature Gate Valve is manufactured to precise specifications and undergoes rigorous testing, including shell tests, seat tests, and cryogenic performance validation where required. With an annual export value reflecting our global reach across North America, Europe, Asia, and beyond, we have proven our capability to supply reliable valve solutions to diverse and demanding markets. Our strategic location with multiple ports of shipment ensures efficient logistics. For your next marine or industrial cryogenic project, choose a valve built for extreme performance and enduring reliability. Contact us today to discuss your specifications and receive a detailed quotation.
Frequently Asked Questions (FAQ):
-
Q: Why is an extended bonnet necessary for a cryogenic gate valve?
A: The extended bonnet creates a thermal barrier. It distances the stem packing and operating mechanism (handwheel/actuator) from the ultra-cold process fluid, preventing the packing from freezing solid and ensuring the valve remains operable at all times, which is a critical safety feature. -
Q: What materials are suitable for the body of this valve at -196°C?
A: Materials must retain toughness. Austenitic stainless steels like 304, 316, 316L (ASTM A351 CF8, CF8M, CF3M) are standard. For specific services, materials like nickel alloys (Monel), 9% nickel steel, or aluminum bronze may be used. Material selection is based on the specific fluid and design code requirements. -
Q: Can this valve be automated?
A: Yes. While often supplied with a manual handwheel or gear operator for direct access, these valves are fully compatible with pneumatic, hydraulic, or electric actuators. The extended yoke design accommodates standard actuators. Actuator selection should account for the low ambient temperature at the installation site. -
Q: What testing is performed on these cryogenic valves?
A> Standard tests include shell and seat pressure tests per API 598. For cryogenic service, additional tests like low-temperature seat tests (using liquid nitrogen or helium) may be performed to verify sealing performance at the designated operating temperature. Documentation like NDT reports and material certificates are provided. -
Q: What is the difference between a standard gate valve and this cryogenic version for marine use?
A: Beyond the extended bonnet, differences include: material grade certification for low-temperature impact resistance, specialized stem packing design, often a longer overall dimension to accommodate the bonnet, and more rigorous testing protocols to ensure performance in the marine cryogenic environment. -
Q: What end connection types are available?
A: Flanged ends (Raised Face RF or Ring Type Joint RTJ) are most common for marine pipework, facilitating installation and maintenance. Butt weld ends are available for permanent, leak-free connections in critical lines. Socket weld ends may be offered for smaller sizes. -
Q: How do I select the correct pressure class (e.g., Class 150 vs. 300)?
A> The pressure class is determined by the maximum working pressure and temperature of your specific system. You must provide the design pressure and temperature, and the fluid service. We can then recommend the appropriate ANSI/ASME pressure class to ensure safety and compliance. -
Q: Do you offer customization for specific project requirements?
A: Yes. As a manufacturer, we can discuss modifications such as specific material trim, special coatings or surface treatments, unique face-to-face dimensions, integrated mounting pads for actuators, or the inclusion of locking devices. Please provide your detailed specifications for review.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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