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Help CenterLarge Diameter Dual Plate Check Valve for Marine PN1.6MPa DN400 Ductile Iron Body Stainless Steel Disc
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Shanghai Zhibang Valve Manufacture Co., Ltd. is a professional manufacturer established in 2016, specializing in high-quality valve solutions for marine and industrial applications. Our Large Diameter Dual Plate Check Valve PN1.6MPa DN400 features a Ductile Iron body and Stainless Steel disc, designed specifically to handle demanding marine environments. With an annual export value of US$1 Million to US$1.5 Million and ISO9001 certification, we deliver reliability and performance that global buyers trust.
This check valve is engineered to prevent backflow in piping systems while offering minimal pressure drop and quick closing action. The dual plate design reduces installation space and weight compared to traditional swing check valves, making it ideal for shipboard systems where space is critical. Whether for ballast water, cooling water, or fuel oil lines, our DN400 valve ensures long-term durability and low maintenance.
Key Features & Specifications
- Large Diameter Capacity: DN400 (16 inches) suitable for high-flow marine systems.
- Ductile Iron Body: Offers superior strength, corrosion resistance, and shock absorption compared to cast iron.
- Stainless Steel Disc (SS304/316): Provides excellent resistance to seawater and aggressive fluids.
- PN1.6MPa Pressure Rating: Rated for 16 bar working pressure, compliant with marine class requirements.
- Low Pressure Drop: Optimized hydrodynamic design reduces energy loss in the system.
- Spring-Assisted Closing: Ensures rapid shut-off even in vertical or horizontal installations.
- Compact Design: Face-to-face dimensions per API 594, saving valuable piping space.
- Temperature Range: -20°C to +120°C (standard), with options for higher temperatures available.
| Parameter | Specification |
|---|---|
| Body Material | Ductile Iron (ASTM A536, Grade 60-40-18) |
| Disc Material | Stainless Steel (SS304 / SS316 / Duplex optional) |
| Seat Material | EPDM / NBR / PTFE (optional) |
| Nominal Diameter | DN400 (16 inches) |
| Pressure Rating | PN1.6MPa (16 bar / 232 psi) |
| End Connections | Wafer (lugged or flanged available upon request) |
| Design Standard | API 594, ISO 9001 quality system |
| Testing | 100% hydrostatic test, shell test 1.5x rated pressure |
Advantages for Marine Applications
- Corrosion Resistance: Ductile iron body with epoxy paint (2-coat) and stainless steel internals resist saltwater corrosion effectively.
- Space-Saving: Dual plate design requires only 1/3 the face-to-face length of swing check valves.
- Low Maintenance: Fewer moving parts and self-cleaning disc design reduce overhaul frequency.
- Versatile Installation: Can be mounted horizontally or vertically without additional supports.
- Noise Reduction: Spring-assisted closure minimizes water hammer and operational noise.
- Customizable: Options for different disc materials (e.g., alloy steel, monel), seat elastomers, and coatings available upon request.
Our manufacturing process strictly follows ISO9001:2015 quality management system. Each valve undergoes rigorous inspection including dimensional check, material traceability, and pressure testing. We serve a global customer base with ports of shipment in Shanghai, Guangzhou, Hong Kong, and Beijing, and our products have been exported to North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Middle East, and beyond.
Why choose Shanghai Zhibang? With over 8 years of valve manufacturing experience and an annual export value exceeding US$1 million, we are committed to delivering durable, compliant, and cost-effective solutions. Our team can adapt the valve to meet specific class society requirements (e.g., CCS, DNV, ABS) upon request. We invite you to contact us for detailed quotations, drawings, or sample testing.
Frequently Asked Questions (FAQ)
The valve is rated PN1.6MPa (16 bar). Higher pressure ratings (e.g., PN2.5MPa or PN4.0MPa) can be produced upon request.
Yes, the stainless steel disc (SS316 recommended) and ductile iron body with epoxy coating provide excellent resistance to seawater corrosion. For aggressive media, alternative elastomers like Viton are available.
Standard temperature range is -20°C to +120°C. For higher temperatures (up to 250°C), we can use special disc coatings or seat materials.
Yes, the spring-loaded dual plate design allows installation in both horizontal and vertical pipelines (flow direction upward).
We can arrange classification society inspection (e.g., DNV, BV, ABS, CCS) as an optional service. The valve is already manufactured under ISO9001 procedures.
For DN400 wafer type, typical length is 229 mm per API 594. Please contact us for detailed dimensional drawings.
MOQ is 1 piece for stock sizes. For special materials or custom designs, minimum quantity may apply. We offer sample orders for qualification.
Standard DN400 valves are usually available within 15-25 days. Custom orders may require 30-45 days depending on complexity.
With our proven track record and dedicated after-sales support, we ensure your satisfaction. Contact us today to discuss your marine check valve requirements.
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