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Help CenterZhibang Valve Dual Plate Check Valve for Seawater, 1 Year Warranty, Mill Test Report Included
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Shanghai Zhibang Valve Manufacture Co., Ltd., an ISO9001-certified manufacturer established in 2016, proudly presents the Zhibang Valve Dual Plate Check Valve specially designed for seawater applications. With an annual export value of US$1–1.5 million and a global footprint across North America, Europe, Asia, Africa, and Oceania, our company combines engineering excellence with cost-effective manufacturing. This dual plate check valve offers reliable backflow prevention in corrosive seawater environments, backed by a 1-year warranty and a comprehensive Mill Test Report to assure every customer of its quality and performance.
Key Features & Benefits
- Seawater-resistant materials – Constructed from high-grade stainless steel 316L or optional duplex alloys to withstand chloride pitting and crevice corrosion.
- Dual plate spring-assisted design – Quick closing action minimizes water hammer and protects downstream equipment.
- Wafer type body – Compact and lightweight, reduces installation space and piping costs.
- Low pressure drop – Streamlined flow path ensures efficiency in pumping systems.
- Full compliance with API 594 – Meets international standards for wafer check valves.
- Mill Test Report included – Provides material traceability and mechanical property verification for every batch.
- 1-year warranty – Covers manufacturing defects, offering peace of mind for long-term operations.
Technical Specifications
| Parameter | Details |
|---|---|
| Size Range | 2" – 24" (DN50 – DN600) |
| Pressure Rating | Class 150, Class 300 (PN10 – PN50) |
| Body Material | SS316L, SS316, Duplex 2205 (optional) |
| Disc Material | SS316L / Duplex |
| Seal Material | PTFE, EPDM, or Viton (for seawater) |
| Connection | Wafer type between flanges (ASME B16.5) |
| Working Temperature | -20°C to +180°C (depending on seal) |
| Test Standard | API 598 (hydrostatic & pneumatic) |
Why Choose This Valve?
The Zhibang Valve Dual Plate Check Valve is specifically engineered for seawater systems such as desalination plants, offshore platforms, marine ballast lines, and coastal cooling circuits. Its dual plate design reduces wear on seat surfaces and provides a reliable seal even under low flow conditions. The included Mill Test Report documents the chemical and mechanical properties of the materials used, giving you full traceability – a critical requirement in many marine and industrial projects. Moreover, our factory in Shanghai ensures strict quality control throughout the manufacturing process, from raw material inspection to final pressure testing.
Trusted by global clients: With an annual export value exceeding US$1 million and a presence in over 10 international markets including North America, Eastern Europe, and Southeast Asia, Shanghai Zhibang Valve has established a reputation for reliable delivery and consistent quality. Our ISO9001 certification further validates our commitment to continuous improvement. Every dual plate check valve is shipped with a 1-year warranty against manufacturing defects, and our technical team is always available for installation support and after-sales service.
Frequently Asked Questions (FAQ)
-
Q: Is this valve suitable for high-salinity seawater?
A: Yes, the standard SS316L material offers excellent resistance in most seawater environments. For higher chloride concentrations, we recommend optional Duplex 2205. -
Q: What is included in the Mill Test Report?
A: The report includes chemical composition analysis, tensile strength, yield strength, elongation, and hardness values for the body and disc materials. -
Q: Can the valve be used in vertical pipes?
A: Yes, the spring-assisted dual plates allow installation in both horizontal and vertical upward flow orientations. -
Q: What is the typical lead time?
A: For standard sizes (2"–10"), the lead time is 15–20 working days. Custom sizes or materials may take 25–30 days. -
Q: Do you provide third-party inspection?
A: Yes, we can arrange inspection by BV, Lloyd's, or other agencies upon request at an additional cost. -
Q: How does the dual plate design differ from single plate?
A: Dual plates reduce inertia, close faster, and generate less water hammer, making them ideal for seawater systems with fluctuating flow. -
Q: What is the pressure drop across the valve at full open?
A: Typically less than 0.02 bar for water at nominal velocity, thanks to the streamlined disc profiles. -
Q: Is the valve non-slam?
A: Yes, the spring-assisted closure ensures a non-slam operation, protecting the system from pressure surges.
Contact Shanghai Zhibang Valve Manufacture Co., Ltd. today for a competitive quotation or technical datasheet. We ship from Shanghai, Guangzhou, and Hong Kong ports to destinations worldwide. Experience the reliability of a valve that comes with full documentation and a 1-year warranty – your seawater system deserves nothing less.
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