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As a professional manufacturer with over 8 years of valve production experience, Shanghai Zhibang Valve Manufacture Co., Ltd proudly presents our Ductile Iron Dual Plate Check Valve DN500 Marine Large Diameter Wafer Type PN1.0MPa SS304 Disc. This high-performance check valve is engineered to meet the rigorous demands of marine and industrial applications, offering reliable backflow prevention and minimal pressure loss. Our valve combines the strength of ductile iron body with the corrosion resistance of SS304 disc, ensuring long service life even in harsh seawater environments.
The dual plate design significantly reduces water hammer and provides quick response to flow changes. With a large diameter of DN500 and a compact wafer configuration, this valve is ideal for space-constrained installations in shipbuilding, offshore platforms, and water treatment systems. We strictly adhere to ISO9001 quality management system, guaranteeing consistent performance and safety.
Key Features & Benefits
- Robust Ductile Iron Body: Superior strength and impact resistance, suitable for high-pressure marine environments.
- SS304 Disc & Spring: Excellent corrosion resistance against seawater and chemicals, extending valve lifespan.
- Compact Wafer Design: Lightweight and easy to install between flanges, saving space and reducing support structure costs.
- Low Pressure Drop: Optimized flow path minimizes energy loss, improving system efficiency.
- Non-Slam Operation: Dual plates close quickly and quietly, preventing water hammer and protecting downstream equipment.
- Wide Application Range: Suitable for seawater, freshwater, oil, gas, and various industrial fluids.
- Easy Maintenance: Simple structure allows quick inspection and replacement of internal parts.
Technical Specifications
| Nominal Diameter | DN500 (20 inches) |
| Pressure Rating | PN1.0MPa (10 bar / 145 psi) |
| Body Material | Ductile Iron (ASTM A536 60-40-18 or equivalent) |
| Disc Material | SS304 (AISI 304) |
| Seat Material | EPDM or NBR (optional) |
| Face-to-Face Dimension | Per API 594 / BS 5153 |
| Connection Type | Wafer type (between PN10/PN16 flanges) |
| Operating Temperature | -20°C to +120°C (depending on seat material) |
Design & Quality Assurance
Our dual plate check valve follows the latest industry standards including API 594 and BS 5153. Each valve undergoes rigorous testing: shell hydrostatic test, seat leakage test (air or water), and operating torque verification. The SS304 disc and spring are heat-treated to ensure consistent elasticity and long-term reliability. We offer customizable seat materials (EPDM, NBR, Viton) to suit different fluid compatibility requirements.
For marine applications, the valve body is coated with marine-grade epoxy paint (optional) to provide extra protection against saltwater corrosion. The large diameter DN500 design is specifically optimized for low flow resistance, making it an excellent choice for ballast water systems, cooling water lines, and fire-fighting systems on ships.
Why Choose Shanghai Zhibang Valve?
Established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd has grown into a reliable valve supplier with annual export value of US$1 million to US$1.5 million. Our products are exported to North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market. With an ISO9001 certified quality system, we ensure that every valve meets stringent international standards. Our experienced team provides professional technical support and after-sales service. We are committed to delivering durable, cost-effective, and high-performance valve solutions to customers worldwide.
Contact us today for a quotation or technical consultation. We offer competitive pricing, fast delivery from Shanghai port (also available from Guangzhou, Hong Kong, Beijing), and customized packaging options. Trust Shanghai Zhibang Valve for your next marine or industrial project.
Frequently Asked Questions (FAQ)
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Q: Can this valve be used for seawater applications?
A: Yes, the SS304 disc and spring offer good corrosion resistance in seawater. For more aggressive environments, we recommend a seat material of EPDM or Viton, and the body can be epoxy-coated upon request. -
Q: What is the maximum operating pressure for DN500 PN1.0MPa?
A: The rated pressure is PN1.0MPa (10 bar). It can safely operate up to 1.0 MPa at ambient temperature. Higher pressure ratings (e.g., PN1.6MPa) are available upon request. -
Q: How does the wafer design install between flanges?
A: The valve is sandwiched between two pipe flanges using long bolts. Centering lugs or alignment features ensure correct positioning. No additional gaskets are required if the flange faces are flat. -
Q: Is the valve suitable for vertical or horizontal pipe installation?
A: This dual plate check valve can be installed in both horizontal and vertical pipes (flow upward), as long as the disc axis is horizontal. For vertical downward flow, a spring-assisted model is recommended. -
Q: What is the warranty period?
A: We provide a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranty options are available upon negotiation. -
Q: Can I get a sample before bulk order?
A: Yes, we accept sample orders. The sample cost can be deducted from the first bulk order. Lead time for a sample DN500 valve is typically 15-20 working days. -
Q: Does the valve come with test certificates?
A: Yes, we provide material test certificates (MTC), hydrostatic test reports, and a certificate of conformity. Additional third-party inspection (e.g., by Lloyds or DNV) can be arranged at extra cost. -
Q: What are the packaging and shipping details?
A: Each valve is individually packed in plywood cases or steel pallets according to export standards. We ship from Shanghai port, with options for Guangzhou, Hong Kong, or Beijing. Shipping method can be by sea, air, or courier.
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