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Help CenterDuplex Stainless Steel Marine Check Valve for Desulfurization Tower, DN50-DN200, PN1.0-4.0MPa Flanged
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Shanghai Zhibang Valve Manufacture Co., Ltd (established in 2016, annual export value US$1–1.5 million) is proud to present our Duplex Stainless Steel Marine Check Valve, specially engineered for desulfurization tower applications. With ISO9001 certification and decades of collective expertise, we deliver valves that withstand extreme corrosion, high pressure, and harsh marine environments. Our check valve is the ideal solution for preventing backflow in flue gas desulfurization (FGD) systems, ensuring operational safety and long service life.
This flanged check valve is available in sizes from DN50 to DN200 and pressure ratings from PN1.0 to PN4.0MPa, making it suitable for a wide range of industrial pipelines. The use of duplex stainless steel (UNS S31803/S32205) provides excellent resistance to chloride stress corrosion cracking and pitting, which are common in desulfurization and seawater environments. Our valves are designed with a compact structure, low pressure drop, and reliable sealing performance, reducing maintenance costs and downtime.
Key Features & Benefits:
- Superior Corrosion Resistance: Duplex stainless steel offers twice the yield strength of austenitic stainless steel and excellent resistance to sulfuric acid, chlorides, and other aggressive media found in desulfurization towers.
- Wide Pressure & Size Range: Suitable for PN1.0–4.0MPa (class 150–300) and DN50–200, covering most desulfurization and marine piping requirements.
- Flanged Connections: Available in ANSI, DIN, GB, HG standards for easy installation and compatibility with existing systems.
- Low Pressure Drop: Optimized disc design minimizes flow resistance, saving energy and improving system efficiency.
- Reliable Sealing: Metal-to-metal or soft-seat options ensure zero backflow even under low differential pressure.
- Long Service Life: High mechanical strength and fatigue resistance reduce wear and extend maintenance intervals.
- Customizable: Available in swing type (gravity) or lift type (spring assisted); materials, finishes, and accessories can be tailored upon request.
Technical Specifications:
| Parameter | Details |
| Size Range | DN50, DN65, DN80, DN100, DN125, DN150, DN200 (2", 2.5", 3", 4", 5", 6", 8") |
| Pressure Rating | PN1.0 MPa (150LB), PN1.6 MPa, PN2.5 MPa, PN4.0 MPa (300LB) |
| Material | Duplex Stainless Steel (UNS S31803, S32205) – Body, Disc, Seat |
| Connection | Flanged: ANSI B16.5, DIN 2633, GB/T 9119, HG 20592 (choice needed) |
| Design Standard | API 6D, BS 1868, GB/T 12236 |
| Working Temperature | -20°C to +250°C (higher on request) |
| Application | Desulfurization tower, seawater cooling, offshore platforms, chemical processing |
| Certification | ISO9001:2015; material certificates available |
Why Choose Zhibang Duplex Stainless Steel Marine Check Valve?
Our valves are manufactured using advanced CNC machining and precision casting, ensuring tight tolerances and consistent quality. Every valve undergoes hydrostatic and pneumatic pressure testing before shipment. The duplex stainless steel composition (typically 22% Cr, 5-6% Ni, 3% Mo, 0.15% N) provides a high PRE value (Pitting Resistance Equivalent >35), guaranteeing superior protection against localized corrosion.
For desulfurization towers, where lime slurry, gypsum, and acidic condensate are present, our check valve prevents backflow that could damage upstream equipment. The flanged design allows easy installation in vertical or horizontal pipelines. Optional features include extended stems, locking devices, and position indicators for remote monitoring.
As a manufacturer with a decade of experience, Shanghai Zhibang Valve has supplied over 10,000 check valves to projects in North America, Europe, Southeast Asia, and the Middle East. Our ISO9001-certified quality management system ensures traceability from raw material to final test. We offer competitive pricing, fast lead times (15–30 days for standard sizes), and comprehensive after-sales support.
Trusted by Global Clients: Our annual export value of US$1–1.5 million reflects the confidence our international customers place in our products. Main markets include North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Western Europe, Central America, and South Asia. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports.
Frequently Asked Questions:
-
Q: Can this valve be used for seawater?
A: Yes, duplex stainless steel (UNS S31803/S32205) is highly resistant to chloride-induced corrosion, making it ideal for seawater and brackish water applications. -
Q: What is the maximum working temperature?
A: Standard design range is -20°C to +250°C. For higher temperature applications, please contact our engineering team for customized solutions. -
Q: Do you provide soft-seat or metal-seat options?
A: Both options are available. Metal-seat is recommended for high-temperature or abrasive media; soft-seat (PTFE, PEEK) offers better sealing at low pressure. -
Q: Can the valve be installed vertically?
A: Yes, our swing and lift check valves can be installed in vertical or horizontal pipelines. For vertical down-flow, a spring-assisted lift type is recommended. -
Q: What flanges standards do you support?
A: We can manufacture flanges per ANSI B16.5, DIN 2633, GB/T 9119, HG 20592, and JIS standards. Please specify when ordering. -
Q: What is the typical delivery time?
A: For standard sizes (DN50–DN200) and common materials, lead time is 15–30 days. Custom orders may take 30–45 days depending on complexity. -
Q: Do you provide material certificates?
A: Yes, we can provide mill test certificates (MTC) for raw materials and hydrostatic test reports upon request. -
Q: What warranty do you offer?
A: We provide a standard 12-month warranty against manufacturing defects. Extended warranty is available for negotiated terms.
Ready to Order? Contact our sales team today for a quote or technical consultation. With Zhibang Valve, you get a reliable partner for your desulfurization and marine projects.
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