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Help CenterDNV LR Certified Marine Low Temperature Gate Valve, -196℃ to 80℃
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As a professional manufacturer with a strong export presence across global markets, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in engineering high-performance fluid control solutions for demanding industrial applications. Our DNV and LR Certified Marine Low Temperature Gate Valve represents our commitment to excellence, designed specifically for the rigorous challenges of cryogenic service in marine and offshore environments. This valve ensures reliable isolation and control of ultra-low temperature fluids, from liquefied natural gas (LNG) to liquid nitrogen, providing unmatched safety and operational integrity for your critical systems. Built to withstand extreme thermal cycles, it is a cornerstone component for shipbuilders, offshore platform operators, and cryogenic logistics companies worldwide.
Engineered for peak performance in the harshest conditions, this gate valve incorporates several advanced features:
- Extended Bonnet Design: Features a long, insulated bonnet that positions the stem packing and operating mechanism away from the extreme cold of the fluid path. This prevents packing freeze-up, ensures smooth operation, and protects personnel by maintaining the handwheel at a safe, ambient temperature.
- Specialized Seat and Seal Technology: Utilizes resilient seals or metal-to-metal seating (often with Stellite or similar hard-facing) compatible with cryogenic temperatures to maintain a bubble-tight seal and prevent leakage, which is critical for both safety and efficiency.
- Robust Construction: The valve body, bonnet, and trim are manufactured from austenitic stainless steels (like CF8/304 or CF8M/316) or other low-temperature carbon steels that retain toughness and prevent brittle fracture at temperatures as low as -196°C.
- Fire-Safe Design (Optional): Many models are available with fire-safe features in accordance with API 607/API 6FA standards, providing an additional layer of protection in case of emergency.
- Anti-Static and Blowout-Proof Stem: The stem is designed to prevent static electricity buildup and is securely retained to avoid ejection under pressure, enhancing operational safety.
- Full Bore or Reduced Bore: Available in configurations to minimize pressure drop (full port) or to reduce weight and cost where applicable (reduced port), offering flexibility for different system designs.
The valve's technical specifications are tailored for marine cryogenic service. Below is a summary of common parameters; specific configurations can be customized upon request.
| Parameter | Specification / Option |
| Design & Test Standards | BS 6364, ISO 28921, MSS SP-134 |
| Size Range (Nominal Bore) | DN 15 (1/2") to DN 600 (24") |
| Pressure Class (PN/Class) | PN16/Class 150, PN40/Class 300, PN100/Class 600 |
| Face-to-Face Dimensions | ISO 5752, ASME B16.10, or Custom |
| Flange Standards | ASME B16.5, EN 1092-1, JIS B2220 |
| Leakage Class (Seat) | Class VI (Soft Seat) or Class IV (Metal Seat) per API 598 |
Choosing our low-temperature gate valve delivers significant advantages for your project. It provides long-term reliability, reducing maintenance downtime and total cost of ownership. The dual DNV and LR certification streamlines the approval process for shipbuilding and offshore projects, saving valuable time. Its robust design ensures system safety, protecting both assets and personnel. Furthermore, its efficient flow characteristics minimize energy loss in cryogenic transfer lines. For EPC contractors and shipyards, this valve offers a proven, specification-compliant solution that simplifies procurement and installation.
Shanghai Zhibang Valve operates a certified ISO9001 quality management system, ensuring consistent manufacturing excellence from raw material inspection to final testing. Our annual export value of US$1-1.5 Million demonstrates our capacity and reliability in serving a diverse international clientele across North America, Europe, Asia, and beyond. With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we offer flexible and efficient logistics to meet your project timelines. Our valve undergoes rigorous cryogenic testing, including shell strength tests and seat leakage tests at its rated low temperature, to guarantee performance as specified. Trust in our expertise as a dedicated manufacturer to provide a valve that not only meets but supports the success of your most demanding marine cryogenic applications. Contact us today for a detailed quotation or technical consultation.
Frequently Asked Questions (FAQ)
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What fluids is this valve suitable for?
This valve is engineered for cryogenic liquids and gases such as LNG (Liquefied Natural Gas), LN2 (Liquid Nitrogen), LOX (Liquid Oxygen), LAr (Liquid Argon), LPG, and ethylene. Material selection can be adjusted based on the specific fluid's properties. -
Why is DNV and LR certification important for a marine valve?
DNV (Det Norske Veritas) and LR (Lloyd's Register) are leading international marine classification societies. Their certification is often a mandatory requirement for valves used on classified ships and offshore installations, ensuring the product meets stringent safety, design, and quality standards for maritime use. -
Can this valve be supplied with actuators?
Yes. The valve can be furnished with electric, pneumatic, or hydraulic actuators for remote or automated operation. The extended bonnet design accommodates various actuator mounting configurations. Actuator specifications should be provided for a complete package quote. -
How do you prevent external icing on the valve?
The extended bonnet design minimizes heat transfer to the operating parts. For additional protection, the bonnet can be insulated or equipped with a drip plate. In some cases, a purging connection is provided to introduce a dry gas (like nitrogen) into the bonnet chamber to prevent moisture ingress and icing. -
What is the typical delivery time for a custom-sized valve?
Standard sizes and pressures often have shorter lead times. For custom specifications (non-standard size, special material, exotic trim), lead time varies. We recommend contacting our sales team with your specific requirements for an accurate production schedule. -
What testing is performed before shipment?
Each valve undergoes a standard factory acceptance test including hydrostatic shell test, seat test (with helium for cryogenic valves is common), and operational checks. Cryogenic prototype testing or production testing at low temperatures can be arranged subject to agreement. -
Do you provide documentation with the valve?
Yes. A comprehensive documentation package is provided, typically including Material Test Certificates (MTC/CMTR), Certificate of Conformity, Pressure Test Report, Dimensional Drawing, and copies of relevant certifications (DNV, LR, ISO9001). -
What are the main maintenance considerations?
Primary maintenance involves periodic inspection of stem packing for leakage and ensuring smooth operation. Due to the extended bonnet, repacking can often be performed under pressure if a live-loaded packing system is specified. Full maintenance guidelines are provided in the product manual.
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