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Home > Industrial Equipment & Components > Valve > Check Valve > Duplex SS Check Valve for Marine, 316L/LDX 2101 Grade, DN100 PN40, Forged Body, Anti-Backflow
Duplex SS Check Valve for Marine, 316L/LDX 2101 Grade, DN100 PN40, Forged Body, Anti-Backflow
Product Spotlights
Duplex SS 316L/LDX 2101 forged body check valve for marine: anti-backflow, DN100 PN40, compact, corrosion-resistant, ISO9001 factory, custom flanges, spring-assisted closure.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Material:
Other, Duplex Stainless Steel 316L / LDX 2101
Function:
Other, Anti-Backflow / Non-Return
Application:
Other, Marine
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Material
Other, Duplex Stainless Steel 316L / LDX 2101
Function
Other, Anti-Backflow / Non-Return
Application
Other, Marine
Standard
Other, ISO9001 Factory Certified (Product comply with marine standards)
Size
DN100 (4 inch)
Pressure Rating
PN40 (40 bar / 580 psi)
Body Type
Forged Steel
Connection
Flanged (Available upon request for other types)
Shanghai Zhibang Valve Manufacture Co., Ltd (established 2016, annual export value US$1-1.5 million) presents a premium-grade Duplex SS Check Valve engineered specifically for demanding marine environments. Manufactured from high-strength 316L / LDX 2101 duplex stainless steel with a forged body, this DN100 PN40 valve delivers reliable anti-backflow performance while resisting corrosion from seawater, chemicals, and high-pressure surges. Our factory is ISO9001 certified, ensuring every unit meets rigorous quality control standards. Whether you need a direct replacement or a custom solution, this check valve offers exceptional durability and long service life for your shipboard or offshore system.
Key Features & Technical Specifications
- Superior Material Selection – Duplex stainless steel (316L + LDX 2101) combines excellent corrosion resistance with high mechanical strength, ideal for aggressive marine media.
- Forged Body Construction – Monolithic forging eliminates weak points, providing better pressure containment and longer fatigue life compared to cast alternatives.
- Positive Anti-Backflow Protection – Spring-assisted disc design ensures immediate sealing when flow reverses, preventing back-pressure damage to pumps and pipelines.
- Compact & Lightweight – Forged body reduces overall weight without compromising strength, making installation and maintenance easier in confined shipboard spaces.
- Wide Application Range – Suitable for ballast systems, cooling water lines, fuel oil transfer, fire-fighting systems, and other marine duties.
| Parameter | Value |
| Nominal Diameter | DN100 (4") |
| Pressure Rating | PN40 (40 bar / 580 psi) |
| Body Material | Duplex SS 316L / LDX 2101 |
| Disc Material | 316L SS or Duplex SS (customizable) |
| Seat Material | Stainless Steel + PTFE (optional) |
| End Connection | Flanged (DIN / ANSI / JIS upon request) |
| Operating Temperature | -20°C to +250°C (depending on seals) |
| Application | Marine, Offshore, Industrial |
Customer Benefits
- Reduced Downtime – Forged body withstands vibration and thermal cycling, minimizing leakage risk and service intervals.
- Lower Lifecycle Cost – Duplex stainless steel offers superior resistance to pitting and crevice corrosion, extending valve service life by 2–3 times compared to standard 316L.
- Easy Integration – Standard flanged dimensions allow direct replacement of existing check valves without pipe modification.
- Enhanced Safety – Quick-closing spring mechanism prevents water hammer and protects downstream equipment from reverse flow.
Why Choose Shanghai Zhibang Valve?
Since 2016, we have exported over USD 1 million worth of valves annually to more than 15 countries across North America, Europe, Asia, and Africa. Our ISO9001 quality management system ensures consistent product quality, and we offer flexible shipping from Shanghai, Guangzhou, Hong Kong, or Beijing ports. Every duplex check valve undergoes hydrostatic and seat leakage tests before dispatch. We understand the strict requirements of the marine industry—our valves have been successfully installed in cargo ships, oil tankers, and offshore platforms. Contact us today for a quote or technical consultation, and experience reliable performance backed by a dedicated manufacturer.
Frequently Asked Questions
-
Q: What is the difference between LDX 2101 and 316L duplex stainless steel?
A: LDX 2101 is a lean duplex grade with higher strength and better stress corrosion resistance than 316L, while 316L offers excellent general corrosion resistance. Our valve uses a combination to optimize performance in marine environments. -
Q: Can this check valve be used for seawater applications?
A: Yes, the duplex stainless steel construction is specifically designed to resist chloride-induced corrosion in seawater, ballast water, and brackish water systems. -
Q: Does the valve come with a spring? Is it horizontal or vertical mount?
A: It includes a spring-loaded disc for quick sealing. The valve can be installed in both horizontal and vertical orientations; for vertical upward flow, the spring assists closing. -
Q: What flanges standards are available?
A: Standard is DIN PN40 flanges. We can also provide ANSI 300# or JIS 40K upon request. Please specify when ordering. -
Q: What pressure testing is performed?
A: Each valve is hydrostatically tested at 1.5x PN (60 bar) on the body and seat leakage tested at PN (40 bar) to ensure zero backflow. -
Q: What is the typical lead time?
A: For standard DN100 PN40 in duplex material, lead time is 20–30 working days. Customized materials or connections may take longer. -
Q: Do you provide certificates of material and testing?
A: Yes, we can issue material test reports (MTR) and hydrostatic test certificates as per ISO9001 requirements. -
Q: Can I get a sample for evaluation?
A: Sample orders are welcome. Contact our sales team for sample pricing and shipping arrangements.
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
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