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Help CenterDuplex Stainless Steel Ball Valve CB/T3191 With Mill Test Report and 2-Year Warranty
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As a dedicated manufacturer with over eight years of expertise, Shanghai Zhibang Valve Manufacture Co., Ltd. presents its premium Duplex Stainless Steel Ball Valve manufactured strictly under the CB/T3191 standard. Engineered for demanding marine and industrial applications, this valve combines exceptional corrosion resistance with high structural strength, offering a reliable and long-lasting solution for fluid control systems. Each valve is backed by a comprehensive Mill Test Report, providing full traceability of material properties, and comes with a solid 2-Year Warranty, underscoring our commitment to quality and customer confidence.
This valve is designed to excel in environments where standard stainless steels may fail, such as seawater, chlorides, and acidic media. Its duplex structure provides a balanced microstructure offering advantages over both austenitic and ferritic grades.
Core Technical Specifications & Advantages:
- Superior Material Performance: The use of Duplex Stainless Steel (typically Grade 2205) delivers approximately double the yield strength of standard 316L, while maintaining excellent corrosion resistance, particularly against pitting and crevice corrosion.
- Standard Compliance: Manufactured in accordance with CB/T3191, a Chinese national standard for marine valves, ensuring design, material, and testing requirements suitable for shipboard and offshore use.
- Enhanced Sealing & Durability: Utilizes high-performance seat materials like PTFE or reinforced variants, ensuring tight shut-off and extended service life even with abrasive or corrosive fluids.
- Operational Flexibility: Available with various actuation options to suit your control system – from simple manual levers to gear operators or automated pneumatic actuators.
- Full Documentation & Traceability: The included Mill Test Report (MTR) details the chemical composition, mechanical properties, and heat treatment of the raw material, providing verifiable proof of quality and compliance.
- Wide Application Suitability: Ideal for critical applications in shipbuilding, offshore platforms, chemical processing plants, oil & gas pipelines, and power generation where reliability is paramount.
| Parameter | Typical Specification / Range | Notes |
|---|---|---|
| Primary Material | Duplex Stainless Steel UNS S32205 / 2205 | Other duplex grades available upon request |
| Design Standard | CB/T3191 | Compatible with ANSI, DIN, JIS design principles |
| Size Range (Nominal) | DN15 (1/2") to DN300 (12") | Flanged or threaded ends |
| Pressure Rating | PN16, PN25, PN40 (Common) | Corresponds to ANSI Class 150, 300 |
| Temperature Range | -20°C to +200°C | Depends on seat material selection |
| Seat Material Options | PTFE, Reinforced PTFE, PPL | Customizable for specific media |
| Actuation | Manual Lever, Gearbox, Pneumatic | Electric actuators also optional |
The benefits for your project are clear: reduced maintenance costs due to superior corrosion resistance, enhanced safety from reliable performance under pressure, and long-term operational savings thanks to extended service life. The 2-year warranty provides peace of mind, while the MTR simplifies quality audits and compliance procedures.
Shanghai Zhibang Valve operates under an ISO9001 certified quality management system, ensuring consistent manufacturing standards. Our valves are trusted globally, with an annual export value between US$1 Million and US$1.5 Million, serving diverse markets from North America and Europe to Southeast Asia and Africa. We ship efficiently from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing. This global footprint and proven export capability demonstrate our reliability as a supplier for your international projects.
Invest in a valve that is built to last and documented to prove it. The combination of duplex stainless steel, CB/T3191 compliance, full material traceability, and a meaningful warranty offers a compelling value proposition for engineers and procurement specialists seeking durable and verifiable fluid control components. Contact us to discuss your specific size, pressure, and actuation requirements, or to request a detailed quotation.
Frequently Asked Questions (FAQ):
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What is the main advantage of Duplex Stainless Steel over 316L for a ball valve?
Duplex stainless steel offers significantly higher strength (about twice the yield strength) and better resistance to stress corrosion cracking and pitting corrosion, especially in chloride-containing environments like seawater. This leads to a more robust and longer-lasting valve body. -
What does the CB/T3191 standard specify?
CB/T3191 is a Chinese technical standard for "Marine Cast Steel Valves." It covers requirements for design, materials, manufacturing, testing, and marking for valves used on ships and marine structures, ensuring suitability for maritime service conditions. -
What information is included in the Mill Test Report (MTR)?
The MTR is a certificate from the steel mill. It typically includes the material grade, heat number, chemical composition analysis, mechanical property test results (tensile strength, yield strength, elongation), and any applicable heat treatment records, providing full material traceability. -
Does the 2-Year Warranty cover all components?
The warranty generally covers defects in materials and workmanship under normal use conditions as specified. It applies to the main valve body, ball, stem, and seats. Specific terms are provided with the product documentation. -
Can this valve be used with actuators for automated control?
Yes. The valve is designed to be compatible with various actuators. We can supply it as a manual valve, or pre-assembled with pneumatic, electric, or hydraulic actuators based on your system requirements. -
Are other end connection standards besides flanged available?
Absolutely. While flanged connections are common for larger sizes, threaded ends (NPT, BSP) are available for smaller sizes. Connections can be manufactured to meet ANSI, DIN, JIS, GB, or other international standards upon request. -
What applications is this valve NOT recommended for?
While highly corrosion-resistant, duplex stainless steel may not be suitable for extremely high-temperature applications beyond its recommended range (e.g., above 250°C depending on seat material) or for media that specifically attack duplex grades. Consultation for specific media is advised. -
How does the ISO9001 certification benefit the customer?
Our ISO9001 certification ensures that our manufacturing processes are systematically controlled and continually improved. This translates to consistent product quality, reliable documentation, and a professional approach to meeting customer specifications and handling orders.
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