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Help CenterLow-Temperature Service CB/T3191 Reduced Bore Marine Ball Valve With Extended Stem
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As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance industrial valves for demanding global applications. Our Low-Temperature Service CB/T3191 Reduced Bore Marine Ball Valve with Extended Stem is engineered to deliver exceptional reliability and safety in critical cryogenic environments, such as LNG carriers, gas processing plants, and chemical transport systems. We combine stringent quality control with deep industry expertise to offer valves that meet the precise needs of our clients in North America, South America, Europe, Asia, Africa, and beyond.
This specialized marine ball valve is designed for superior performance where extreme cold is a constant operational challenge. The extended stem is a key feature, allowing for the installation of insulation materials or enabling the valve to be mounted outside a cold box, protecting the actuator from freezing and ensuring smooth, reliable operation. Constructed in compliance with the Chinese shipbuilding standard CB/T3191, it guarantees compatibility and reliability in marine and offshore applications.
Key Features & Technical Advantages:
- Cryogenic Material Construction: The valve body, ball, and stem are manufactured from specially selected materials such as low-temperature carbon steel (LTCS) or stainless steel (e.g., CF8M), which retain toughness and prevent brittle fracture at temperatures as low as -196°C (-320°F).
- Extended Stem Design: The extended neck moves the sealing and operating mechanism away from the extremely cold pipeline fluid, preventing stem packing freeze-up and ensuring the operability of the actuator in ambient conditions.
- Reduced Bore (RB) Configuration: Offers a smaller flow path than the pipeline, which reduces the required operating torque and the overall weight and size of the valve, making it a cost-effective and space-saving solution without significantly impacting flow for many applications.
- Advanced Sealing System: Utilizes low-temperature compatible seat materials like reinforced PTFE (RPTFE) or special polymers (PPL) that maintain elasticity and sealing integrity under cryogenic conditions. Metal-seated versions are available for high-pressure or abrasive services.
- Fire-Safe Design Option: Available with fire-tested designs where secondary metal seals engage in case of a fire, ensuring continued isolation and preventing catastrophic failure.
- Anti-Static & Blow-Out Proof Stem: Integrated features ensure safety by preventing static electricity buildup and guaranteeing the stem cannot be ejected under pressure.
Technical Specifications Table:
| Parameter | Specification |
|---|---|
| Design & Manufacturing Standard | CB/T3191, GB/T12237, API 608 |
| Size Range | DN15 (1/2") to DN300 (12") |
| Pressure Rating | PN16, PN25, PN40, PN63, PN100 (Class 150, 300, 600) |
| Temperature Range | Standard: -29°C to 200°C; Low-Temp: -46°C, -101°C, -196°C |
| Body Material | WCB, LCB, CF8, CF8M, CF3, CF3M, Duplex Stainless Steel |
| End Connection | Flanged (RF, FF), Threaded (NPT, BSP), Butt Weld |
| Stem Extension Length | Customizable as per insulation thickness or application requirement |
| Operation | Manual (Lever/Wrench), Gear Operator, Pneumatic Actuator, Electric Actuator |
Benefits for Your Operations:
- Enhanced Safety & Reliability: The robust design and material selection minimize the risk of leakage or failure in critical low-temperature systems, protecting personnel, assets, and the environment.
- Reduced Maintenance & Downtime: The extended stem design and high-quality sealing components significantly reduce the frequency of maintenance interventions caused by freezing or seal degradation.
- Operational Flexibility: Available in a wide range of sizes, materials, and actuation methods, this valve can be tailored to fit specific process requirements, from manual shipboard use to fully automated plant control.
- Global Compliance & Compatibility: Manufactured to recognized industry standards, ensuring easy integration into existing international projects and supply chains.
With an annual export value between US$1 Million and US$1.5 Million and a strong presence across continents from North America to Oceania, Shanghai Zhibang has proven its capability to deliver quality valves reliably. Our products are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. The ISO9001 certification underpins our commitment to consistent quality. Choosing our Low-Temperature Marine Ball Valve means investing in a component built for durability, safety, and performance in the world's most challenging environments. Contact us today to discuss how this valve can be configured for your specific cryogenic application.
Frequently Asked Questions (FAQ):
Q1: What is the primary purpose of the extended stem on this ball valve?
A1: The extended stem, often called an extended neck or elongated stem, is designed to isolate the valve's operating mechanism (packing, actuator) from the extremely cold process fluid. This prevents the stem packing from freezing, ensures the actuator operates at ambient temperature, and allows for the installation of insulation around the valve body without hindering operation.
Q2: Can this valve be used for services other than LNG or cryogenics?
A2: Absolutely. While optimized for low temperatures, its robust construction and sealing options make it suitable for a wide range of applications, including chilled water systems, refrigeration, chemical processing with cold media, and offshore oil & gas where low ambient temperatures are encountered.
Q3: How does the "Reduced Bore" design affect valve performance?
A3: A reduced bore (or standard port) valve has a flow aperture smaller than the connecting pipe's inner diameter. This reduces the valve's weight, size, and required operating torque. The pressure drop is slightly higher than a full-bore valve, but for many applications where absolute flow capacity is not the limiting factor, it offers a more economical and compact solution.
Q4: What actuator options are compatible with this valve?
A4: The valve can be fitted with various actuators based on your control needs. Options include manual levers or gearboxes for infrequent operation, and pneumatic (double-acting or spring-return) or electric actuators for automated process control systems. The extended stem design accommodates all standard actuator mounting interfaces.
Q5: Are special certifications available for marine use?
A5: The valve is manufactured according to the CB/T3191 standard, which is a Chinese standard for marine valves. Other common marine approvals such as ABS, BV, DNV, GL, LR, or CCS can be provided upon request, subject to specific project requirements and associated testing.
Q6: What is the typical delivery lead time for a custom-configured valve?
A6: Lead times vary based on the order size, material specifications, and actuation requirements. For standard configurations in common materials, we typically maintain stock or offer shorter lead times. For fully customized orders, our team will provide a precise production schedule upon receipt of your detailed specifications.
Q7: Do you provide after-sales support and spare parts?
A7: Yes, as a manufacturer, we provide comprehensive after-sales support. This includes technical documentation, installation guidance, and readily available spare parts such as seals, stems, and seats to ensure the long-term performance and serviceability of your valves.
Q8: What packaging is used for export to ensure valve integrity?
A8: Valves are carefully prepared for export. They are cleaned, dried, and all internal passages are sealed with protective caps/plugs. The valves are then packed in wooden crates or plywood boxes with suitable internal cushioning to prevent damage during long-distance sea or land transportation.
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