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Help CenterZhibang Valve Marine Ductile Iron Dual Plate Check Valve DN50-DN600 PN16, Wafer Connection, Epoxy Coated
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016 and headquartered in Shanghai, China, is a dedicated manufacturer specializing in high-performance valve solutions. With an annual export value between US$ 1 million and US$ 1.5 million, we have built a solid reputation serving markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. Our Zhibang Valve Marine Ductile Iron Dual Plate Check Valve (DN50-DN600, PN16, Wafer Connection, Epoxy Coated) is engineered to deliver reliable backflow prevention in demanding marine and industrial applications. Combining robust ductile iron construction with a compact wafer design and corrosion-resistant epoxy coating, this valve offers exceptional durability, minimal maintenance, and long service life.
The dual plate check valve features a spring-loaded, two-plate disc that closes quickly upon flow reversal, effectively preventing water hammer and protecting downstream equipment. Its wafer body allows for easy installation between flanges, saving space and reducing overall system weight. Available in sizes from DN50 to DN600 with a PN16 pressure rating, this valve is suitable for a wide range of working conditions including fresh water, seawater, oil, and gas. The epoxy coating (both internal and external) provides excellent resistance to corrosion, abrasion, and chemical attack, making it an ideal choice for marine environments and harsh industrial settings.
| Parameter | Specification |
|---|---|
| Body Material | Ductile Iron (GGG40.3 / GGG50) |
| Disc Material | Ductile Iron / Stainless Steel (optional) |
| Seat Material | NBR / EPDM / Viton (optional) |
| Size Range | DN50 – DN600 (2" – 24") |
| Pressure Rating | PN16 (Class 150 also available upon request) |
| Connection | Wafer type between flanges (EN 1092-2 / ASME B16.5) |
| Face to Face | EN 558 Series 20 / ISO 5752 |
| Coating | Epoxy, internal & external (min. 250 μm) |
| Working Temperature | -20°C to +120°C (depending on seat material) |
Key Features & Benefits
- Durable Ductile Iron Construction: Offers higher strength and impact resistance than cast iron, ensuring long-term reliability even under high pressure surges.
- Compact Wafer Design: Saves space and reduces weight; easy to install between flanges with simple centering lugs.
- Spring-Loaded Dual Disc: Provides quick closing response, minimizing water hammer and protecting piping systems.
- Full Epoxy Coating: Superior corrosion protection for both internal and external surfaces – ideal for seawater, wastewater, and chemical environments.
- Low Pressure Drop: Streamlined flow path and lightweight disc design reduce head loss, improving system efficiency.
- Versatile Seat Options: Choose NBR, EPDM, or Viton to suit different media and temperature requirements.
- Bi-Directional Flow Capability (optional): Can be configured for dual-direction sealing upon request.
- Maintenance-Free Operation: No external moving parts; hinge pin and spring are fully enclosed and corrosion-resistant.
Technical Advantages for Your Application
Our dual plate check valve is designed to meet the rigorous demands of marine systems including ballast water management, cooling water lines, and fire-fighting networks. It also excels in industrial sectors such as water treatment, HVAC, oil & gas, and power generation. The wafer configuration allows direct installation between standard flanges (EN or ASME), eliminating the need for additional gaskets or support brackets. With pressure testing per ISO 5208, each valve undergoes rigorous shell and seat leak tests to ensure zero leakage. The epoxy coating complies with DIN 30677 or similar standards, providing long-term protection against aggressive media.
Customers benefit from reduced installation time, lower spare parts inventory (due to interchangeability), and lower total cost of ownership thanks to the valve's extended service life. We also offer customization options such as different disc materials (SS304, SS316), special coatings, and non-standard face-to-face dimensions. For high-temperature or critical applications, consult our engineering team for tailored solutions.
Why Choose Shanghai Zhibang Valve?
As a ISO9001-certified manufacturer since 2016, we have built a dedicated production system that ensures consistent quality and on-time delivery. Our annual export volume of US$1-1.5 million reflects the trust of customers across North America, South America, Europe, Asia, Africa, and Oceania. We ship from major Chinese ports including Shanghai, Guangzhou, Hong Kong, and Beijing, offering flexible logistics solutions. Our commitment to continuous improvement, competitive pricing, and responsive technical support makes us a reliable partner for OEMs, distributors, and EPC contractors worldwide. We invite you to contact us for a quotation, sample testing, or any technical inquiries. Let us help you optimize your fluid control system with a high-quality, cost-effective check valve.
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 open and close quickly, reducing water hammer and requiring less space. Swing check valves have a single disc that swings open; they are larger and more prone to slamming. Dual plate valves are ideal for compact installations and higher cycle applications.
2. Can this valve be installed vertically or horizontally?
Yes, the spring-loaded dual plate design allows for installation in both horizontal and vertical (upward flow) orientations. For optimal performance in vertical lines, ensure flow is upward.
3. What seat materials are available for different media?
Standard seat is NBR (suitable for oil, water, air). Optional EPDM is for hot water, steam, and mild chemicals; Viton is for aggressive chemicals and high temperatures. Contact us for compatibility with your specific fluid.
4. Is the epoxy coating suitable for seawater?
Yes, our epoxy coating (≥250 μm) provides excellent corrosion resistance in seawater environments. For extended submersion, we recommend stainless steel discs and additional cathodic protection if needed.
5. What pressure testing do you perform?
Each valve is hydraulically tested according to ISO 5208: shell test at 1.5× rated pressure and seat test at 1.1× rated pressure. A test certificate is provided upon request.
6. Can you supply Class 150 (PN20) flanges instead of PN16?
Yes, the same wafer body can be adapted for ASME Class 150 flanges. Please specify your requirement when ordering, and we will confirm the face-to-face dimensions and drilling pattern.
7. What is the lead time for standard sizes?
For DN50-DN300, typical lead time is 15-25 working days after order confirmation. Larger sizes (DN350-DN600) may require 25-35 working days depending on coating and material availability.
8. Do you offer customization for non-standard face-to-face lengths?
Yes, we can manufacture special face-to-face dimensions according to your drawing or specific standard. A minimum order quantity may apply. Contact our sales team for details.
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