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Help CenterDN50-DN300 Ductile Iron Marine Check Valve PN1.0-1.6MPa Flanged End Epoxy Coated BV Certified Ballast Water
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Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our series of Ductile Iron Marine Check Valves in sizes DN50 to DN300, designed specifically for ballast water systems and other marine applications. Manufactured with high-grade ductile iron and coated with a durable epoxy finish, these valves offer exceptional corrosion resistance and reliable non-return performance under pressures up to PN1.6MPa. With BV (Bureau Veritas) certification and strict adherence to ISO9001 quality management, our check valves ensure safe, long-lasting operation in the demanding marine environment.
Key Features & Technical Specifications:
| Size Range | DN50 – DN300 (2” – 12”) |
| Pressure Rating | PN1.0 – PN1.6MPa (150 – 232 PSI) |
| Material | Ductile Iron (GGG40/GGG50) with Epoxy Coating |
| End Connection | Flanged (RF, FF, or custom) |
| Certification | BV (Bureau Veritas) – Marine & Ballast Water |
| Operation | Automatic (spring-assisted or gravity type) |
Our marine check valves are engineered to prevent backflow in ballast water pipelines, protecting pumps and systems from reverse pressure. The ductile iron body provides high strength and impact resistance, while the internal epoxy coating (minimum 250µm thickness) offers outstanding corrosion protection against seawater and aggressive ballast water chemicals. All valves are tested to ensure zero leakage at rated pressure.
- Durable Construction: Ductile iron provides higher yield strength than cast iron, ideal for high-pressure marine systems.
- Corrosion Resistant Epoxy Coating: Fusion-bonded epoxy inside and out prevents rust and extends service life.
- BV Certified: Each valve carries Bureau Veritas type approval for ballast water treatment systems.
- Low Pressure Drop: Streamlined disc design minimizes flow resistance, reducing energy costs.
- Easy Installation: Flanged ends conform to DIN/ANSI/JIS standards, available upon request.
- Customizable: Options include various trim materials (316SS, bronze), disc types (swing, lift, dual plate), and spring settings.
Benefits for Your Marine Operations:
- Reliable backflow prevention in ballast water pipelines, complying with IMO D2 standards.
- Reduced maintenance frequency thanks to the robust epoxy coating and ductile iron body.
- Compatible with common flanges (PN10/16, Class 150), simplifying retrofit projects.
- Proven performance in thousands of installations worldwide.
As a dedicated manufacturer since 2016, Shanghai Zhibang Valve has exported valves worth over US$1 million annually to markets including North America, Europe, Southeast Asia, and Oceania. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports, ensuring timely delivery. Our ISO9001-certified production line and strict quality control guarantee product consistency. With a strong engineering team, we also offer custom designs to meet specific pressure, temperature, or flange requirements.
Choose our DN50-DN300 Ductile Iron Marine Check Valve for a reliable, BV-approved solution that protects your ballast water system. Contact us today for a quote or technical consultation – we are ready to support your marine projects with competitive pricing and professional after-sales service.
Frequently Asked Questions
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Q: What is the maximum working pressure of this valve?
A: The standard pressure rating is PN1.0 to PN1.6 MPa (150-232 PSI). Higher pressure ratings (e.g., PN2.5) are available upon request as a customization. -
Q: Is BV certification included with every valve?
A: Yes, all standard sizes from DN50 to DN300 are supplied with BV (Bureau Veritas) type approval certification for ballast water systems. Third-party inspection reports can be provided. -
Q: What flange standards do you support?
A: We offer flanges according to DIN PN10/16, ANSI Class 150, JIS 10K, and other standards. Please specify your requirement when ordering. -
Q: Can the epoxy coating withstand seawater and ballast water chemicals?
A: Yes, our epoxy coating is formulated for marine environments. It resists saltwater, hydrocarbons, and common ballast water treatment chemicals (e.g., chlorine, ozone). The minimum coating thickness is 250µm. -
Q: What disc types are available?
A: We mainly supply swing check and spring-loaded disc types. Dual plate check valves are also available for space-saving installations. Contact our sales team for details. -
Q: Do you offer non-standard sizes or custom pressure ratings?
A: Yes, we can customize dimensions, pressure ratings, and materials. Minimum order quantity may apply for non-standard items. -
Q: How long is the delivery time?
A: For standard sizes and quantities (up to 100 pieces), typical delivery is 15-25 working days after order confirmation. Larger orders or custom products may require 30-45 days. -
Q: Do you provide a warranty?
A: Yes, we offer a 12-month warranty from the date of shipment covering manufacturing defects. Extended warranty options are available upon request.
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