Contact Platform Support
Help Center
Home > Industrial Equipment & Components > Valve > Check Valve > Duplex Stainless Steel Marine Check Valve for Desulfurization, Standard Compliant, Factory Direct With Warranty
Duplex Stainless Steel Marine Check Valve for Desulfurization, Standard Compliant, Factory Direct With Warranty
Product Spotlights
Duplex stainless steel construction provides exceptional corrosion resistance for desulfurization and marine environments. Factory direct pricing with full warranty. ISO9001 certified, globally exported. Customizable sizes, connections, and materials. Low pressure drop design, reliable sealing, and easy maintenance. Backed by an experienced manufacturer with strong export track record.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Material:
Other, Duplex Stainless Steel (e.g., UNS S31803, S32205)
Application:
Other, Desulfurization
Type:
Check Valve (Swing or Lift type)
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
Related Products
-
Cryogenic Swing Check Valve for LNG Tanker, SS316 Body, PN40, DN50-DN200, API 602 CompliantNegotiableMOQ: 1 Unit -
Marine Check Valve Designed for LNG Carrier Cargo Handling Systems, Cryogenic Service, Stainless SteelNegotiableMOQ: 1 Unit
-
LNG Ship Ballast System Check Valve, Low Temperature Resistant, Marine Grade Stainless Steel, DN15-DN100NegotiableMOQ: 1 Unit
-
Stainless Steel Marine Check Valve for LNG Carrier, DN15-DN100, PN1.6-4.0MPa, Flanged, -196°CNegotiableMOQ: 1 Unit
-
OEM Marine LNG Check Valve, 304 Stainless Steel, Flanged, With Material Certificate and 18-Month WarrantyNegotiableMOQ: 1 Unit
Material
Other, Duplex Stainless Steel (e.g., UNS S31803, S32205)
Application
Other, Desulfurization
Type
Check Valve (Swing or Lift type)
Connection
Flanged / Wafer / Threaded (customizable)
Size Range
1/2“ to 24“ (customizable)
Pressure Rating
Class 150 to 600 (available)
Temperature Range
-20°C to 400°C (depending on material)
Certification
ISO9001
Brand
Shanghai Zhibang Valve
Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our premium Duplex Stainless Steel Marine Check Valve, specifically engineered for desulfurization systems in marine and industrial environments. Manufactured in strict compliance with international standards, our valves are factory-direct and backed by comprehensive warranty, ensuring cost-effective and reliable fluid control solutions. With over 8 years of specialized manufacturing experience (since 2016) and ISO9001 certification, we deliver products that excel in corrosive and high-stress applications.
Our check valves are constructed from high-grade duplex stainless steel (such as UNS S31803, S32205, or S32750), offering exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking – critical for desulfurization processes where aggressive acidic condensates and seawater are present. The marine-grade design ensures reliable performance under dynamic loads, vibrations, and harsh saltwater atmospheres. Each valve undergoes rigorous pressure testing and dimensional inspection to guarantee leak-proof sealing and long service life.
Key Technical Specifications:
| Parameter | Specification |
|---|---|
| Material | Duplex Stainless Steel (2205, 2507) or equivalent |
| Valve Type | Swing Check / Lift Check (both available) |
| Connection | Flanged (ASME/ANSI B16.5), Wafer (ASME B16.34), Threaded (NPT/BSP) |
| Size Range | DN15 – DN600 (1/2" – 24"), custom sizes on request |
| Pressure Class | Class 150, 300, 600 (PN10 – PN100) |
| Temperature Range | -29°C to +350°C (for standard duplex; up to +538°C with super duplex options) |
| Sealing Material | Metal-to-metal, PTFE, or RPTFE (optional) |
| Design Standards | API 594, API 6D, BS 1868, ASME B16.34 (compliant) |
| Certification | ISO9001:2015; additional certifications (API, CE) available upon request |
Outstanding Features & Benefits:
- Superior Corrosion Resistance: Duplex stainless steel offers twice the yield strength of austenitic grades and exceptional resistance to chloride-induced stress corrosion cracking—ideal for desulfurization scrubber systems and seawater cooling lines.
- Low Pressure Drop: Optimized disc and seat geometry minimizes flow resistance, reducing energy consumption and improving system efficiency.
- Reliable Backflow Prevention: Heavy-duty hinged disc (for swing type) or spring-assisted piston (for lift type) ensures tight shut-off even under low-pressure differentials.
- Easy Maintenance: Modular design allows quick disassembly for inspection or replacement of internal components without removing the valve from the pipeline.
- Factory Direct Pricing: As the original manufacturer, we eliminate distributor markups, offering competitive prices without compromising quality.
- Full Warranty Coverage: Each valve comes with a standard 12-18 month warranty against manufacturing defects, with extended warranty options available.
- Customizable Options: We provide tailored solutions including special end connections, exotic materials (super duplex, 6Mo), NACE compliance, and special coatings (PTFE, epoxy).
- Stringent Quality Control: 100% pressure testing (hydrostatic and pneumatic) per API 598, dye penetrant examination, and positive material identification (PMI) on all alloy components.
Applications: Our duplex stainless steel check valves are widely used in:
- FGD (Flue Gas Desulfurization) systems in power plants
- Marine ballast water treatment and seawater cooling
- Offshore oil & gas platforms (topside and subsea)
- Chemical processing involving chlorides, acids, and caustic solutions
- Desalination plants and water injection systems
After-Sales Service & Technical Support: We provide comprehensive documentation including material certificates, test reports, installation manuals, and 3D drawings. Our experienced engineering team offers free consultation for valve selection and system integration. For complex requirements, we can design custom check valves within 2-4 weeks.
Why Choose Shanghai Zhibang Valve?
- Established in 2016, we have grown into a specialized manufacturer with annual export value of US$1 million – US$1.5 million.
- Our products are exported to North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market – a testament to our global trust.
- We are ISO9001:2015 certified, ensuring robust quality management from raw material procurement to final delivery.
- Located in Shanghai, China, we leverage convenient logistics for prompt shipping from major ports: Shanghai, Guangzhou, Hong Kong, and Beijing.
- We offer OEM/ODM services and accept small trial orders before bulk production.
With our factory-direct model and commitment to excellence, you get a high-performance valve that meets the most demanding desulfurization and marine conditions. We invite you to contact our sales team today for a quote or technical consultation. Together, we can ensure your system runs smoothly with reliable, long-lasting fluid control.
Frequently Asked Questions (FAQ):
-
What media can this check valve handle?
Our duplex stainless steel check valves are suitable for a wide range of corrosive media including seawater, flue gas condensates, brine, dilute acids, caustic solutions, and hydrocarbons. For specific chemical compatibility, please consult our technical team. -
What is the maximum operating temperature?
Standard duplex valves handle up to 350°C (660°F), while super duplex options (e.g., UNS S32750) can operate up to 538°C (1000°F) for dry gases. Please specify your temperature range when ordering. -
Can I get a different connection type?
Yes, we offer flanged, wafer, lug, threaded, and socket weld connections. For special connection standards (e.g., JIS, DIN), we can customize upon request. -
What is the typical lead time?
Standard sizes and materials: 15-25 working days. Custom orders or exotic materials: 30-45 working days. Rush service is available for an additional fee. -
Do you provide a warranty?
All valves come with a 12-month warranty against material and workmanship defects. Extended warranty up to 3 years is optional. Warranty covers replacement or repair of defective parts. -
Is there a minimum order quantity (MOQ)?
No strict MOQ for standard valves – we accept single pieces as samples. For custom designs, MOQ may apply (typically 5-10 pieces). -
Can you supply material test certificates or third-party inspection?
Yes, we provide EN 10204 3.1 material certificates, PMI reports, hydrostatic test reports, and dimensional inspection records. Third-party inspection by SGS, BV, or TÜV is available at additional cost. -
How does this valve compare to a conventional check valve in desulfurization service?
Our duplex valve offers significantly higher corrosion resistance than carbon steel or 304/316 stainless steel valves. The improved mechanical strength allows for lighter weight and reduced maintenance frequency, resulting in lower total cost of ownership.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
You May Also Like
-
Marine Check Valve for LNG Carrier, 2 Year Warranty, Mill Test Report Included, Stainless Steel BodyNegotiableMOQ: 1 Unit
-
Dual Plate Check Valve for LNG Ship, ASTM A352 LCB, PN1.6-4.0MPa, DN15-DN100, Full PortNegotiableMOQ: 1 Unit
-
Marine Grade Non-Return Valve for LNG Carriers, 304 Stainless Steel, Low Temp to -196°C, Flanged EndsNegotiableMOQ: 1 Unit
-
Tilting Disc Check Valve for LNG Carrier, Stainless Steel, Low Pressure Drop, DN25-DN100, PN16/40NegotiableMOQ: 1 Unit
-
Marine LNG Carrier Check Valve, Stainless Steel Body, Flanged Connection, PN1.6-4.0MPa, DN15-DN100NegotiableMOQ: 1 Unit
-
WCB Cast Steel Marine Check Valve Customized Non-Standard Class150 2"-12" Threaded ConnectionNegotiableMOQ: 1 Unit
-
Ductile Iron Marine Check Valve Customized Non-Standard PN25 Wafer Type With NBR SealNegotiableMOQ: 1 Unit
-
Marine Check Valve Customized Non-Standard 304SS Dual Plate Spring Return PN10/PN16 Lug StyleNegotiableMOQ: 1 Unit
-
Offshore Platform Application Marine Check Valve Customized Non-Standard Corrosion Resistant CoatingNegotiableMOQ: 1 Unit
-
316 Stainless Steel Marine Check Valve Customized Non-Standard DN50-DN300 PN16 Flanged EndNegotiableMOQ: 1 Unit
