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Help CenterOffshore Seawater Dual Plate Check Valve, Cast Iron Body, 316L Disc, BV Certified
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Shanghai Zhibang Valve Manufacture Co., Ltd. has been a dedicated manufacturer of high-performance industrial valves since 2016. Our Offshore Seawater Dual Plate Check Valve with Cast Iron Body and 316L Disc is specifically engineered to withstand the harsh corrosive environment of offshore seawater applications. This valve combines robust construction with advanced sealing technology, ensuring reliable backflow prevention and long service life. Backed by BV Certification and ISO9001 quality management system, our product meets the highest international standards for marine and offshore industries.
The dual plate design offers a compact, lightweight solution compared to traditional swing check valves, reducing installation costs and piping stress. The cast iron body provides excellent strength at an economical price, while the 316L stainless steel disc resists pitting and crevice corrosion in chloride-rich seawater. With an annual export value of US$1 million to US$1.5 million and shipments from major Chinese ports (Shanghai, Guangzhou, Hong Kong, Beijing), we serve global markets including North America, South America, Europe, Asia, Africa, and Oceania. Our engineers have optimized this valve for non-slam operation, minimizing water hammer and protecting downstream equipment.
Key Features & Technical Specifications
- Body Material: Cast Iron (GG25/GGG40) – durable, cost-effective, suitable for seawater with proper coating.
- Disc Material: 316L Stainless Steel – superior corrosion resistance, low carbon content prevents intergranular corrosion.
- Seat Material: Reinforced NBR/EPDM or optional Viton for high-temperature applications.
- Design Standard: API 594 / API 6D / BS 5153 – ensures interchangeability and performance.
- Connection Type: Wafer or lug type – easy installation between flanges, available in ANSI B16.5 or DIN flanges.
- Pressure Rating: PN10 to PN40 (Class 150 to Class 300) – covers low to medium pressure systems.
- Temperature Range: -20°C to +120°C (standard), custom options up to +200°C upon request.
- Non-slam Feature: Spring-assisted closure prevents disc slamming, reducing noise and hammer.
- Low Pressure Drop: Streamlined flow path minimizes energy loss.
- Certifications: BV (Bureau Veritas) Type Approval, ISO9001:2015, available for other global certifications.
| Nominal Diameter (DN) | Overall Length (L) mm | Flange Diameter (D) mm | Bolt Circle (K) mm | Weight (kg) |
|---|---|---|---|---|
| DN80 | 60 | 200 | 160 | 4.5 |
| DN100 | 65 | 220 | 180 | 6.2 |
| DN150 | 75 | 285 | 240 | 11.5 |
| DN200 | 95 | 340 | 295 | 18.0 |
| DN300 | 115 | 445 | 400 | 35.5 |
Detailed Benefits for Your Application:
- Corrosion Resistance: The 316L disc and optional epoxy coating on the cast iron body ensure long-term performance even in highly saline seawater.
- Space & Weight Savings: Dual plate design reduces length and weight by 40-60% compared to conventional check valves, simplifying installation in confined offshore skids.
- Low Maintenance: Fewer moving parts, no external hinges, and self-lubricating bearings reduce downtime and lifecycle costs.
- Versatile Mounting: Can be installed in vertical or horizontal lines with upward or downward flow (spring selection dependent).
- Global Compliance: BV certified for marine use, meeting requirements of major classification societies (DNV, ABS, LR available upon request).
- Customizable: Options include NACE MR0175 compliance, special trim materials, and pressure class upgrades.
Our factory in Shanghai employs advanced CNC machining and testing equipment, with a monthly production capacity exceeding 5,000 units. Each valve undergoes a 100% hydrostatic shell test (1.5x rated pressure) and seat leakage test (air or water) per API 598. With a robust supply chain, we can deliver small orders within 15 days and large project quantities within 30-45 days. Our technical team provides full after-sales support, including installation guidance and troubleshooting.
Since 2016, Shanghai Zhibang Valve has exported to over 30 countries, gaining trust from major EPC contractors and shipyards. Our commitment to quality is reflected in our ISO9001:2015 certification and BV product certification. With an annual export value of US$1 million - US$1.5 million, we continue to invest in R&D to improve valve performance. Choose our Offshore Seawater Dual Plate Check Valve for a reliable, cost-effective solution that meets the toughest marine standards. Contact our sales team today for a competitive quotation or sample request.
Frequently Asked Questions (FAQ)
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Q: What is the maximum working pressure for this valve?
A: The standard pressure rating is PN10 to PN40 (Class 150 to Class 300). Higher ratings such as PN63 can be custom designed. -
Q: Can this valve be used for potable water?
A: Yes, but we recommend a nylon or rubber-lined cast iron body to avoid iron contamination. The 316L disc is safe for potable water. -
Q: What does BV certification cover?
A: BV (Bureau Veritas) certifies that our valves meet the strict requirements for marine applications, including material traceability, design verification, and production inspection. -
Q: Is the cast iron body suitable for seawater immersion?
A: Cast iron is suitable when coated with epoxy or other anti-corrosion coatings. For fully submerged applications, we recommend ductile iron (GGG40) with fusion-bonded epoxy. -
Q: What is the typical lead time?
A: Standard sizes (DN50-DN300) have a lead time of 15-20 working days. Larger sizes or special materials require 25-35 working days. -
Q: Do you provide test certificates?
A: Yes, we provide material certificates (EN 10204 3.1), hydrostatic test reports, and BV inspection certificates as needed. -
Q: Can the valve be installed horizontally?
A: Yes, the dual plate check valve can be installed in any orientation. For horizontal lines with gravity closing, ensure the spring is selected properly. -
Q: What is the warranty period?
A: We offer a standard 12-month warranty from the date of shipment covering manufacturing defects. Extended warranty available on request.
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