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Help CenterMarine Cast Iron Dual Plate Check Valve DN400 PN10 With Mill Test Report Stainless Steel Disc EPDM Seal BV RINA
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016 and based in Shanghai, China, is a professional manufacturer dedicated to producing high-quality valve solutions for global markets. Our Marine Cast Iron Dual Plate Check Valve DN400 PN10 is specifically engineered to meet the demanding requirements of marine and industrial applications. With annual exports exceeding US$1 million, we supply to North America, Europe, Southeast Asia, Africa, Oceania, and beyond. This check valve combines robust cast iron construction, stainless steel disc, and EPDM seal, delivering reliable backflow prevention even in harsh marine environments. Each valve is supplied with a Mill Test Report to ensure material traceability and performance integrity.
Our dual plate check valve features a compact, lightweight wafer design that saves space and reduces installation cost. The spring-assisted dual plates close instantly when flow reverses, preventing water hammer and protecting downstream equipment. The stainless steel disc resists corrosion and wear, while the EPDM elastomer seal provides tight shut-off against seawater, oil, and a wide range of fluids. This valve is ideal for ballast systems, cooling water lines, fire-fighting systems, and other marine piping networks.
Key Product Features & Benefits
- Durable Cast Iron Body: High tensile strength and excellent resistance to seawater corrosion (with appropriate coating). Suitable for long-term marine service.
- Stainless Steel Disc (SS304/SS316): Lightweight yet strong, ensures quick closing action and minimal pressure drop. Optional SS316 for higher corrosion resistance.
- EPDM Seal: Excellent elasticity and chemical resistance, performs well in temperatures from -20°C to +120°C. Suitable for water, seawater, and many chemical media.
- Low Pressure Drop: Streamlined dual plate design allows full bore flow when open, reducing energy loss.
- Non-Slam Operation: Spring-assisted closure eliminates water hammer, protecting pipes and pumps.
- Compact Wafer Style: Fits between flanges, saving weight and space compared to swing check valves. Easy to install and maintain.
- Mill Test Report Included: Provides certified material chemical composition and mechanical properties, ensuring quality assurance for procurement and engineering.
- ISO9001 Certified Manufacturing: Our production process follows strict quality management standards, ensuring consistent product reliability.
Technical Specifications
| Attribute | Value |
| Nominal Diameter | DN400 (16 inch) |
| Pressure Rating | PN10 (10 bar / 145 psi) |
| Body Material | Cast Iron (GG25 / ASTM A48 Class 35) |
| Disc Material | Stainless Steel (CF8 / CF8M) |
| Seal Material | EPDM (For temperature range -20°C ~ +120°C) |
| Connection Type | Wafer (DIN/ANSI flanges compatible) |
| Test Pressure (Shell) | 1.5 x PN (15 bar) |
| Test Pressure (Seat) | 1.1 x PN (11 bar) |
| Standard | ISO9001, Mill Test Report included; Design per API 594 or equivalent |
| Available Options | Disc lock, lever, counterweight, position indicator (upon request) |
Our dual plate check valve is rigorously hydrostatically tested in our facility to ensure no leakage and reliable performance. The Mill Test Report for each valve traces the raw material batch, assuring you of consistent quality. Whether you need it for shipbuilding, marine retrofitting, or industrial water systems, this valve offers an optimal balance of durability, cost-efficiency, and ease of maintenance.
Why Choose Shanghai Zhibang Valve?
- 8+ Years Manufacturing Experience – Founded in 2016, we have exported to over 15 countries and regions worldwide, earning trust from shipyards, EPC contractors, and OEMs.
- Global Shipping Network – We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports, ensuring fast delivery to any major port.
- ISO9001 Certified Quality System – Our quality control covers raw material inspection, in-process checks, and final testing. Every valve is individually pressure tested before shipment.
- Annual Export Value US$1M+ – Our sustained growth and repeat orders prove our product reliability and customer satisfaction.
- Flexible Customizations – We can adjust disc material, seal elastomer, and add accessories (such as position indicator, counterweight) based on your specific project requirements. Contact our sales team for tailored solutions.
Choosing a check valve for a marine application means prioritizing safety and longevity. Our DN400 PN10 dual plate check valve, with its proven design and traceable materials, minimizes downtime and maintenance costs. We invite you to request a quote today and experience the reliability that has made Shanghai Zhibang Valve a preferred supplier in the marine valve sector.
Frequently Asked Questions
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Q: Is this check valve suitable for seawater application?
A: Yes, the cast iron body is coated with marine-grade epoxy paint, and the stainless steel disc (optional SS316) combined with EPDM seal provides excellent resistance to seawater corrosion. We recommend specifying SS316 disc for long-term ballast or cooling water service. -
Q: What does the Mill Test Report contain?
A: The Mill Test Report includes the chemical composition and mechanical test results (tensile strength, yield, elongation) for the cast iron and stainless steel materials used in your valve. It provides full traceability and meets typical ship classification requirements. -
Q: Can this valve be installed between ANSI 150 flanges?
A: The DN400 PN10 valve is designed for DIN PN10 flanges. However, it can be used with ANSI 150 flanges if proper gasket and bolt alignment are provided. Please confirm with our engineering team for your specific flange standard. -
Q: What is the maximum working temperature?
A: The EPDM seal can handle temperatures from -20°C to +120°C. For higher temperature applications, we offer Viton or other elastomers upon request. -
Q: Do you offer a warranty?
A: Yes, we provide a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranty can be negotiated for large orders. -
Q: Can you provide DN400 check valves with other pressure ratings like PN16 or PN25?
A: Yes, we can manufacture the same valve in PN16 or higher ratings by adjusting body thickness and material. Please specify your required pressure class during inquiry. -
Q: How long does it take to ship?
A: For standard DN400 PN10 valves in stock, we can ship within 7-15 days after order confirmation. For custom orders, lead time is typically 25-35 days, depending on quantity and specifications.
For further technical data, a copy of the Mill Test Report sample, or a quotation, please contact our sales department. Shanghai Zhibang Valve is ready to support your marine and industrial projects with quality products and responsive service.
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