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Help CenterMarine Large Diameter Dual Plate Check Valve DN300-DN600 Ductile Iron Body Stainless Steel Disc PN1.0-1.6MPa Wafer Connection
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Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our Marine Large Diameter Dual Plate Check Valve (DN300-DN600) — a high-performance solution designed specifically for demanding marine and industrial backflow prevention applications. Manufactured in our ISO9001-certified facility since 2016, this valve combines robust ductile iron body with stainless steel disc to deliver reliable service under PN1.0-1.6MPa pressure ratings. Its wafer-type connection ensures easy installation between flanges, saving space and maintenance time.
This dual plate check valve features a compact, lightweight design that minimizes pressure drop while providing quick response to flow reversal. The large diameter range (DN300 to DN600) makes it ideal for main pipelines in shipbuilding, offshore platforms, and water treatment systems. Each valve undergoes rigorous quality testing to meet international standards, ensuring long-term durability in saltwater and corrosive environments.
Key Product Features & Benefits
- Ductile Iron Body: Provides exceptional strength and corrosion resistance compared to cast iron, extending service life in marine conditions.
- Stainless Steel Disc & Spring: Offers excellent resistance to seawater corrosion, reducing maintenance frequency and downtime.
- Wafer Connection Design: Allows direct mounting between flanges without additional supports, simplifying installation and reducing overall system weight.
- Low Pressure Drop: Dual plate design minimizes flow resistance, improving energy efficiency of pumping systems.
- Quick Closing Action: Spring-assisted closure prevents water hammer and protects downstream equipment from pressure surges.
- Large Size Range DN300-DN600: Suitable for high-flow applications with diameters up to 24 inches.
- Pressure Ratings PN1.0-1.6MPa: Compatible with standard marine piping systems, offering flexibility for various operating conditions.
| Parameter | Specification |
|---|---|
| Body Material | Ductile Iron (GGG40/GGG50) |
| Disc Material | Stainless Steel (CF8M or 316) |
| Size Range | DN300, DN350, DN400, DN450, DN500, DN600 |
| Pressure Rating | PN1.0 MPa (10 bar) / PN1.6 MPa (16 bar) |
| Connection Type | Wafer (between flanges) |
| Flange Standard | DIN / EN 1092-2, ANSI B16.5 (available upon request) |
| Operating Temperature | -10°C to +120°C (up to +200°C with optional seal) |
| Seal Material | EPDM (standard), NBR, Viton (optional) |
Beyond standard specifications, our marine check valves are designed with a streamlined profile that reduces turbulence and noise. The dual plate design ensures that each plate moves independently, providing a tighter seal even at low flow rates. This feature is particularly valuable in variable flow systems where backflow can occur intermittently.
For marine applications, we offer additional surface treatments such as epoxy coating to enhance resistance to salt spray and UV exposure. The valve can be customized with different spring materials (stainless steel, Hastelloy) for extreme environments. All valves are 100% pressure-tested before shipment to guarantee leak-free performance.
Why Choose Shanghai Zhibang Valve?
Since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. has been dedicated to producing high-quality industrial valves. Our annual export value of US$1 Million - US$1.5 Million reflects the trust of customers across North America, South America, Europe, Africa, Oceania, and Asia. With ISO9001 certification ensuring consistent quality management, every valve we deliver meets strict international requirements.
We ship from major Chinese ports including Shanghai, Guangzhou, Hong Kong, and Beijing, providing flexible logistics solutions to global buyers. Our experienced team offers comprehensive after-sales support, from technical documentation to spare parts availability. Choosing Zhibang means partnering with a manufacturer who understands the critical role of reliable valves in marine and industrial systems.
Contact us today for a quotation or technical consultation. We are ready to provide competitive pricing, short lead times, and customized solutions for your large-diameter backflow prevention needs.
Frequently Asked Questions
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1. What is the difference between a dual plate check valve and a swing check valve?
Dual plate check valves have a shorter face-to-face dimension and lighter weight, making them ideal for space-constrained installations. They also provide faster response to flow reversal, reducing water hammer risk. -
2. Can this valve be used for seawater applications?
Yes, the stainless steel disc and optional epoxy coating make it suitable for seawater. We also offer super duplex stainless steel for highly corrosive environments. -
3. What is the maximum operating temperature?
Standard EPDM seal allows up to 120°C. For higher temperatures, Viton seals can be used up to 200°C. -
4. Are these valves available in non-standard flange drilling?
We can customize flange drilling according to ANSI, JIS, or other standards upon request. Please specify your requirement when ordering. -
5. What is the installation orientation?
These valves can be installed horizontally or vertically, but we recommend horizontal installation for optimal performance. Vertical installation is possible with flow direction upward. -
6. How do I select the correct pressure rating?
Choose PN1.0 for systems with working pressure up to 10 bar, and PN1.6 for up to 16 bar. For higher pressures, please contact our technical team. -
7. Do you provide test certificates?
Yes, each valve comes with a material test certificate and hydrostatic test report as standard. Additional third-party inspection can be arranged. -
8. What is the typical lead time for DN300-DN600 check valves?
Standard lead time is 20-30 days for common sizes. Custom orders may take longer, depending on material availability.
Shanghai Zhibang Valve Manufacture Co., Ltd. – Your reliable partner for high-performance marine valves.
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