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Help CenterMarine Wafer Dual Plate Check Valve With Mill Test Report, Multiple Classification Society Approved
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016 and operating from Shanghai, China, is a professional manufacturer dedicated to supplying high-quality valve solutions for global marine and industrial applications. With an annual export value of US$1 million – US$1.5 million, we have shipped our products to more than 20 countries across North America, South America, Europe, Africa, Oceania, the Middle East, and Asia. Our marine wafer dual plate check valve is designed to meet the demanding requirements of shipbuilding and offshore engineering. Every valve comes with a comprehensive Mill Test Report and is available with approvals from multiple classification societies (ABS, DNV, BV, Lloyd's, etc.) upon request, ensuring full traceability and compliance with international marine standards.
Our wafer dual plate check valve features a compact, lightweight design with a short face-to-face dimension, making it ideal for installation in tight spaces common on ships and offshore platforms. The dual plate mechanism provides rapid closure, minimal pressure drop, and reduced water hammer compared to traditional swing check valves. The valve body and plates are manufactured from high-strength materials such as stainless steel, duplex stainless steel, or carbon steel, with customizable trim options to suit different media (seawater, fresh water, oil, gas). Each valve undergoes strict quality control, including hydrostatic testing, shell testing, and seat leakage testing, as documented in the Mill Test Report.
Key Features & Technical Specifications
- Compact Wafer Design – Saves space and reduces installation costs, fits between standard flanges (ANSI B16.5 / DIN EN 1092).
- Dual Plate Construction – Two spring-loaded plates ensure quick closing and minimize reverse flow, protecting pumps and other equipment.
- Low Pressure Drop – Streamlined flow path reduces energy loss, improving system efficiency.
- Non-Slam Operation – Spring-assisted closure prevents slamming and water hammer, extending valve life.
- Mill Test Report Included – Full material traceability, mechanical properties, and pressure test results are provided with every valve.
- Multiple Classification Society Approval – Approved by ABS, DNV, BV, Lloyd's, CCS, RINA, etc. (subject to requirement), meeting SOLAS and other marine regulations.
- Wide Material Options – Body: Cast Iron, Ductile Iron, Cast Steel, Stainless Steel (CF8, CF8M, CF3M). Plates: Stainless Steel, Duplex SS, Nickel Alloy. Seals: EPDM, NBR, Viton, Metal-to-Metal.
- High Pressure & Temperature Capability – Suitable for Class 150 up to Class 900 (PN10 to PN160), operating temperature range from -20°C to +250°C.
- Easy Maintenance – Simple design with few moving parts, no external lever or hinge pins, reducing maintenance downtime.
- Corrosion Resistance – Suitable for seawater, ballast water, fire-fighting systems, and other marine applications.
Product Parameter Table (Typical)
| Parameter | Value / Range |
|---|---|
| Nominal Diameter (DN) | DN50 – DN600 (2″ – 24″) |
| Pressure Range | PN10 / PN16 / PN25 / PN40 / Class 150 / Class 300 / Class 600 / Class 900 |
| Face-to-Face Standard | API 594 / BS 5153 / ISO 5752 |
| Test Pressure (Shell) | 1.5 x PN (or 1.5 x Class Rating) |
| Test Pressure (Seat) | 1.1 x PN (or 1.1 x Class Rating) |
| Material (Body) | WCB (A216), CF8 (A351), CF8M, Ductile Iron (A536), Cast Iron (A126) |
| Material (Disc) | SS304, SS316, Duplex SS, Bronze (optional) |
| Seal Material | EPDM, NBR, Viton, PTFE, Metal to Metal |
| Spring Material | SS304 / SS316 / Hastelloy (custom) |
| Applicable Standards | API 594, API 602, ASME B16.34, ISO 17292 |
Benefits to Customers
- Reliability in Harsh Marine Environments – Tested for seawater resistance, vibration, and thermal cycling, ensuring long service life.
- Full Traceability & Compliance – Mill Test Report provides material certificates, chemical composition, and mechanical properties. Classification society approval simplifies shipyard inspection.
- Cost-Effective Installation – Wafer design eliminates the need for additional gaskets and reduces flange bolt length, saving installation time and material.
- Low Maintenance – Dual plate design with self-lubricating bearings and corrosion-resistant springs reduces the frequency of replacement.
- Versatility – Suitable for horizontal or vertical piping, bidirectional flow (with appropriate options), and a wide range of media.
Trust & Assurance from Shanghai Zhibang Valve
As a manufacturer with ISO9001:2015 certification, we implement strict quality management throughout the production process—from raw material inspection to final testing. Since 2016, we have served clients in over 10 industries, and our marine valves have been installed on vessels operating in North America, Europe, the Middle East, and Asia. Our annual export value of US$1 million – US$1.5 million demonstrates our growing reputation. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring flexible logistics. Each valve is individually pressure-tested and inspected before shipment; the Mill Test Report is included as standard documentation. If you require specific classification society approval (ABS, DNV, BV, Lloyd's, CCS, etc.), we can arrange third-party inspection and certification. Our dedicated engineers provide technical support before and after the sale.
Choose Shanghai Zhibang Valve for your next marine project. Contact us for a quotation, and let our wafer dual plate check valve deliver reliable performance with full documentation.
FAQ – Frequently Asked Questions
Q1: What is included in the Mill Test Report?
A: The Mill Test Report includes material chemical composition, mechanical properties (tensile, yield, elongation), hardness test results, and pressure test results for shell and seat. It also contains heat number traceability and manufacturing date.
Q2: Can you provide classification society approval certificates?
A: Yes, we can arrange approval from ABS, DNV, BV, Lloyd's, CCS, RINA, or other societies upon request. Additional cost and lead time may apply. Please specify your requirements when ordering.
Q3: What sizes and pressure ratings are available?
A: Standard sizes range from DN50 to DN600 (2″ to 24″). Pressure ratings include PN10/16/25/40/100 and Class 150/300/600/900. Custom sizes and ratings are available upon request.
Q4: Can this valve be used for horizontal piping?
A: Yes, the wafer dual plate check valve can be installed in horizontal or vertical piping. For vertical installations with upward flow, the spring assist ensures proper closing. For downward flow, please consult our engineering team.
Q5: Is the valve suitable for seawater?
A: Yes, with the correct material selection. For seawater applications, we recommend duplex stainless steel or super duplex discs with EPDM or Viton seals. We can also provide coatings for additional protection.
Q6: How do you ensure the product meets marine standards?
A: We adhere to international standards such as API 594, BS 5153, and ISO 5752. Our ISO9001 quality system ensures consistent manufacturing and testing. The Mill Test Report and optional third-party inspection provide verified compliance.
Q7: What is the delivery time?
A: Standard delivery time is 15–30 working days after confirmation of order and payment. For large quantities or special materials, please allow 30–45 working days. We work with shipping ports in Shanghai, Guangzhou, Hong Kong, and Beijing for fast logistics.
Q8: Do you provide after-sales support?
A: Yes, we offer 12-month warranty against manufacturing defects. Our technical team is available for installation guidance, troubleshooting, and replacement parts. We aim to respond within 24 hours.
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