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Help CenterCB/T3191 Duplex Stainless Steel Ball Valve for Chemical Tanker Cargo Line Applications
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As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing robust and reliable fluid control solutions for demanding marine applications. Our CB/T3191 Duplex Stainless Steel Ball Valve is engineered specifically for chemical tanker cargo lines, where safety, durability, and corrosion resistance are paramount. With an annual export value reflecting our global reach, we understand the critical needs of international markets. This valve represents our commitment to delivering products that meet stringent industry standards and ensure the secure handling of aggressive chemicals.
This valve is designed to withstand the harsh environments encountered in marine chemical transport. Its core construction from duplex stainless steel offers a superior combination of high strength and exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-containing media common in marine and chemical service.
Key Features & Technical Advantages:
- Superior Corrosion Resistance: The duplex stainless steel body provides excellent performance against a wide range of acids, alkalis, and solvents, ensuring long service life and reducing maintenance costs.
- High Strength & Leak-proof Design: The material offers roughly twice the yield strength of standard austenitic stainless steels (like 316L), allowing for a more compact and pressure-resistant design. Combined with precision machining and high-performance seat seals, it guarantees a reliable bubble-tight shut-off.
- Compliance with Marine Standards: Manufactured in accordance with the CB/T3191 standard, this valve is suitable for shipbuilding and offshore applications, giving engineers and shipowners confidence in its suitability for cargo systems.
- Versatile Actuation Options: Available in manual (lever or gear), pneumatic, or electric actuated versions to suit different control system requirements onboard tankers.
- Fire-Safe Design (Optional): Certain models can be designed with fire-safe features, where the seat materials can maintain sealing integrity even under exposure to high temperatures, a critical safety consideration.
- Low Maintenance & Easy Operation: The quarter-turn operation allows for quick opening and closing. The robust design minimizes wear, leading to lower lifetime costs.
Detailed Technical Specifications:
| Parameter | Specification / Range |
| Design Standard | CB/T3191 |
| Body Material | Duplex Stainless Steel (UNS S31803/S32205) |
| Size Range | DN15 (1/2") to DN300 (12") (Custom sizes available) |
| Pressure Rating | PN16, PN25, PN40; Class 150, Class 300 |
| Temperature Range | -29°C to 200°C (-20°F to 392°F) Standard |
| End Connection | Flanged (RF, RTJ), Threaded (NPT, BSP), Butt Weld |
| Seat & Seal Material | PTFE, RPTFE, PPL, Metal Seated (for high temp) |
| Operation | Manual Lever, Manual Gear, Pneumatic, Electric |
Benefits for Your Chemical Tanker Operations:
- Enhanced Safety: Reliable sealing prevents cargo leakage, protecting crew, the vessel, and the marine environment.
- Cargo Integrity: The corrosion-resistant material prevents contamination of sensitive chemicals.
- Reduced Downtime: The durability of duplex steel minimizes failures and unscheduled maintenance, keeping your vessel operational.
- Regulatory Compliance: Adherence to CB/T3191 helps meet classification society and maritime regulatory requirements for cargo system components.
- Total Cost of Ownership: While the initial investment might be higher than standard valves, the extended service life and reduced maintenance lead to significant long-term savings.
Shanghai Zhibang's expertise is trusted by partners across North America, South America, Europe, Asia, Africa, and Oceania, with products shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing. Our established manufacturing processes under the ISO9001 quality management system ensure consistent product quality and performance. Choosing our CB/T3191 Duplex Stainless Steel Ball Valve means selecting a component built for reliability in the most challenging chemical tanker applications. It is a strategic investment in the safety and efficiency of your cargo handling system. Contact us today to discuss your specific requirements and receive a tailored quotation.
Frequently Asked Questions (FAQ)
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Q: Why is duplex stainless steel preferred over 316L for chemical tanker valves?
A: Duplex stainless steel offers significantly higher yield strength and better resistance to stress corrosion cracking (SCC) in chloride environments, which are common in marine and chemical service. This makes it more suitable for handling aggressive chemicals and seawater, providing greater safety and longevity. -
Q: What does the CB/T3191 standard signify?
A: CB/T3191 is a Chinese national professional standard for shipbuilding, specifically for forged steel flanged ball valves. It defines requirements for design, materials, manufacturing, testing, and inspection, ensuring the valve is fit for marine applications, including chemical tankers. -
Q: Can this valve handle high-purity or ultra-corrosive chemicals?
A: Yes, the corrosion resistance of duplex stainless steel covers a broad spectrum. For specific ultra-corrosive media or high-purity requirements, we can discuss material grade options (like super duplex) and specialized seat materials (such as PPL or metal seats) to meet your needs. -
Q: Are fire-safe versions available?
A: Yes, fire-safe design is an optional feature. In such models, the seat and seal materials are engineered to maintain sealing integrity for a specified period under fire conditions, which is a critical safety requirement for many tanker applications. -
Q: What actuation methods do you offer?
A: We provide a full range: manual operation with lever or gearbox for direct control, and automated actuation with pneumatic (air) or electric actuators for integration into remote control and monitoring systems onboard. -
Q: What is your lead time for these valves?
A: Lead times vary based on size, specification, and order quantity. Standard configurations typically have shorter lead times. We provide accurate delivery estimates upon receipt of your detailed inquiry. -
Q: Do you provide documentation like material certificates and test reports?
A: Yes, as an ISO9001-certified manufacturer, we provide comprehensive documentation packages, which can include material chemical and mechanical test certificates, pressure test reports, and certificates of conformity as required. -
Q: Can you supply valves with specific end connections or face-to-face dimensions?
A: Absolutely. While we stock valves with common standards (ASME, DIN, JIS, GB), we can customize end connections and dimensions to match your existing pipeline specifications or project requirements.
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