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Help CenterMarine Duplex Stainless Steel Gate Valve 2205 / S31803, Flanged Ends DN50-DN300
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As a professional valve manufacturer with a strong commitment to quality since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Marine Duplex Stainless Steel Gate Valve in grade 2205 (UNS S31803). Engineered specifically for the most demanding environments, this valve combines exceptional strength, superior corrosion resistance, and reliable performance, making it an ideal solution for critical marine, offshore, and industrial fluid control applications. Our extensive experience in exporting to global markets, including North America, Europe, and Southeast Asia, ensures that our products meet the rigorous standards required by international clients.
This flanged gate valve is designed to provide a secure, bubble-tight shut-off in pipelines handling seawater, chlorides, and other aggressive media. The duplex stainless steel 2205 material offers a unique advantage with its balanced microstructure of austenite and ferrite, providing yield strength approximately twice that of standard 316 stainless steel while maintaining excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes it a cost-effective and durable choice for long-term service in harsh conditions.
Key Features and Technical Advantages:
- Enhanced Durability: The duplex 2205/S31803 alloy provides superior resistance to chloride-induced stress corrosion cracking, a common failure point in marine environments, significantly extending valve service life.
- High Strength-to-Weight Ratio: The material's high strength allows for potentially lighter and more compact valve designs compared to other corrosion-resistant alloys, offering installation and handling benefits.
- Robust Construction: Designed in accordance with international standards like API 600 and API 6D, the valve features a solid wedge or flexible wedge design (depending on specification) for reliable sealing and minimal pressure drop in the fully open position.
- Versatile End Connections: Supplied with flanged ends per ASME B16.5 or other international flange standards, ensuring easy integration into existing piping systems from DN50 to DN300.
- Multiple Operation Options: Available with standard handwheel operation, gear operators for high-torque applications, or automated actuation (electric, pneumatic, hydraulic) for remote control and integration into process control systems.
Detailed Technical Specifications:
| Parameter | Specification / Value |
| Body & Trim Material | Duplex Stainless Steel UNS S31803 / 1.4462 (2205) |
| Design & Manufacturing Standards | API 600, API 6D, ISO 10434, ASME B16.34 |
| Pressure Class | Class 150, 300, 600 (Standard), Higher classes available |
| Temperature Range | -29°C to 425°C (-20°F to 800°F) Standard |
| Seat Type | Metal Seated (Standard), Resilient Seated Optional |
| Stem Material | Duplex 2205 or 17-4PH Stainless Steel |
| Packing | Graphite or PTFE based, suitable for high temperatures |
| Flange Face Finish | Raised Face (RF) Standard, Ring Type Joint (RTJ) Optional |
Benefits for Your Operations:
- Reduced Maintenance Costs: Exceptional corrosion resistance minimizes degradation, leading to fewer replacements and lower lifetime maintenance expenses.
- Improved System Reliability: The robust design and high-integrity sealing ensure dependable isolation, preventing costly leaks and downtime in critical processes.
- Operational Flexibility: Suitable for a wide range of services including seawater cooling, ballast systems, firefighting lines, and process fluids in chemical and petrochemical plants.
- Global Compliance: Manufactured under an ISO9001 certified quality management system, our valves are designed to meet the specifications required for projects worldwide.
Shanghai Zhibang Valve backs its products with a proven track record, supplying valves across six continents from our strategic shipping ports in Shanghai, Guangzhou, Hong Kong, and Beijing. Our annual export volume reflects the trust placed in us by a diverse clientele. When you choose our Marine Duplex Stainless Steel Gate Valve, you are not just purchasing a component; you are investing in a durable, high-performance solution engineered for longevity in aggressive service. This valve is designed to withstand the test of time and harsh elements, providing secure and efficient flow control for your most critical applications. Contact us today to discuss your specific requirements for size, pressure class, and actuation, and let our team provide you with a competitive quotation and expert technical support.
Frequently Asked Questions (FAQ):
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Q: What are the primary applications for this Duplex 2205 gate valve?
A: This valve is specifically designed for demanding services where high strength and corrosion resistance are crucial. Common applications include seawater intake and discharge systems on ships and offshore platforms, ballast water systems, chemical processing plants handling chlorides, pulp and paper industry applications, and oil & gas production with high CO2/H2S content. -
Q: How does Duplex 2205 compare to 316L stainless steel for marine use?
A: Duplex 2205 offers significantly higher yield strength (approximately double) and superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) from chlorides compared to 316L. This makes 2205 a more robust and often more economical choice for long-term service in aggressive marine environments. -
Q: Can this valve be supplied with different end connections besides flanged?
A: The standard offering for this product line is flanged ends. However, as a manufacturer, we can accommodate requests for other end types such as butt-weld ends or specific customer flange standards upon request for custom orders. -
Q: What pressure classes and sizes are readily available?
A: We typically stock or have short lead times for sizes from DN50 (2") to DN300 (12") in pressure classes 150 and 300. Class 600 and other sizes within the range are available for production. Please inquire for specific availability. -
Q: Is the valve suitable for both on/off service and throttling?
A: Gate valves are primarily designed for isolation (fully open or fully closed) service. Using them for frequent throttling can lead to seat and disc erosion, vibration, and premature wear. For throttling applications, we recommend consulting with us for alternative valve types better suited for that function. -
Q: What kind of testing and documentation do you provide?
A> Standard valves undergo routine shell and seat pressure tests. We can provide certified test reports (e.g., API 598), material test certificates (MTC/CMTR), and full documentation packages including drawings, packing lists, and certificates of origin as required for your project. -
Q: Do you offer actuated versions of this valve?
A: Yes. We can provide this valve fitted with electric, pneumatic, or hydraulic actuators from reputable brands or our own assembly. We ensure proper sizing and mounting for reliable automated operation. -
Q: What is the typical lead time for an order?
A: Lead time depends on the quantity, size, pressure class, and any special requirements. Standard configurations may have shorter lead times. We provide accurate delivery estimates upon receipt of your detailed inquiry or purchase order.
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