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Help CenterLarge Diameter Dual Plate Check Valve for Marine Main Pipeline DN500 PN1.6MPa Corrosion Resistant Ductile Iron
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Shanghai Zhibang Valve Manufacture Co., Ltd. is a trusted manufacturer with over 8 years of experience in the valve industry. Our Large Diameter Dual Plate Check Valve for marine main pipeline applications (DN500, PN1.6MPa) is engineered to deliver reliable, long-lasting performance in demanding seawater and piping systems. With an annual export value of USD 1–1.5 million, we serve global markets including North America, Europe, Southeast Asia, and the Middle East. This check valve features a corrosion-resistant ductile iron body and a dual-plate design that minimizes pressure drop and prevents water hammer, making it an ideal choice for shipbuilding, offshore platforms, and marine pipeline systems.
Our valves are manufactured under strict ISO9001 quality management, ensuring every unit meets international standards. The dual-plate check valve is specially designed to provide a compact, lightweight solution without sacrificing strength or durability. Whether for ballast systems, cooling water lines, or fire-fighting mains, this valve ensures smooth, unidirectional flow and quick closure to protect pumps and piping.
Key Features & Advantages
- Corrosion-Resistant Ductile Iron Body: Epoxy-coated interior and exterior provide excellent resistance to seawater and aggressive fluids, extending service life in marine environments.
- Dual Plate Design: Two spring-loaded plates close quickly to prevent reverse flow and water hammer, reducing noise and vibration.
- Compact & Lightweight: Wafer-style construction allows easy installation between flanges, saving space and weight compared to swing check valves.
- Low Pressure Drop: Streamlined flow path minimizes head loss, improving system efficiency.
- Non-Slam Operation: Spring-assisted closure ensures plates seat gently, protecting downstream equipment.
- Wide Range of Sizes & Pressure Classes: Available from DN50 to DN1200 and PN6 to PN40 to suit various applications.
- Customizable Coating & Material Options: Optional stainless steel plates, Nitrile/EPDM seals, or special coatings can be provided upon request.
Technical Specifications
| Parameter | Value |
| Nominal Diameter | DN500 (20") |
| Nominal Pressure | PN1.6MPa (232 psi) |
| Body Material | Ductile Iron (GGG40/GGG50) |
| Plate Material | Ductile Iron / Stainless Steel (optional) |
| Seat Material | EPDM / NBR (optional) |
| Coating | Epoxy (min 250 microns) |
| Face-to-Face Dimension | API 594 / EN 558 |
| Flange Drilling | EN 1092-2 / ANSI B16.5 (optional) |
| Operating Temperature | -10°C to +80°C (higher on request) |
| Test Pressure | Shell: 2.4MPa; Seat: 1.76MPa |
Why Choose Shanghai Zhibang Valve?
As a professional manufacturer established in 2016, we have built a solid reputation for quality and on-time delivery. Our factory in Shanghai, China, is equipped with advanced CNC machines, automatic coating lines, and rigorous testing facilities. Each dual plate check valve undergoes hydrostatic and pneumatic testing before shipment. We have exported valves worth over USD 1 million annually to customers in North America, South America, Europe, Africa, Oceania, and Asia. Our ISO9001 certification guarantees consistent quality control from raw material procurement to final inspection.
We understand the critical nature of marine pipeline systems. That's why our DN500 PN1.6 check valve is designed with a reinforced body and corrosion-resistant coating to withstand harsh saltwater environments. The dual-plate mechanism ensures low maintenance and reliable operation for years. We offer flexible shipping options from Shanghai, Guangzhou, Hong Kong, or Beijing, and we can customize colors, coatings, and materials to meet your specific requirements.
Contact us today for a quotation or technical datasheet. Our experienced team is ready to support your marine valve needs with cost-effective solutions and fast delivery.
Frequently Asked Questions (FAQ)
1. What is the difference between a dual plate check valve and a swing check valve?
A dual plate check valve uses two spring-loaded plates that close quickly and silently, reducing water hammer and space requirements. It is lighter and more compact than a swing check valve, making it ideal for marine applications where space is limited.
2. Can this valve be used for seawater service?
Yes, the ductile iron body with epoxy coating provides excellent corrosion resistance in seawater. For optimal performance, we recommend optional stainless steel plates and EPDM seats, which are available upon request.
3. What is the expected lifespan of this check valve?
With proper installation and regular maintenance, the valve can last 10–15 years or more in typical marine environments. The spring and plate assembly are designed for long-cycle operation.
4. Do you provide certificates for material and pressure testing?
Yes, we can provide material certificates, hydrostatic test reports, and ISO9001 documentation. Additional third-party inspection (e.g., Lloyd's, DNV, ABS) can be arranged at extra cost.
5. What flange standards does this valve conform to?
Our valve is designed to EN 1092-2 PN16 drilling as standard. We can also manufacture to ANSI B16.5 Class 150 or other flange standards upon request.
6. Is the valve suitable for vertical pipe installation?
Yes, the dual plate check valve can be installed in both horizontal and vertical pipelines (flow upward). Proper orientation ensures correct plate operation.
7. What is the lead time for DN500 PN1.6 valves?
Standard lead time is 30–45 working days depending on quantity and customization. For urgent orders, please contact us for expedited options.
8. Can I get a sample valve for testing?
Yes, sample orders are welcome. The sample cost will be charged, but we can deduct it from future bulk orders. Please contact our sales team for details.
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