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Help CenterZhibang Valve Marine Ductile Iron Dual Plate Check Valve CCS Certified 24-Month Warranty Mill Test Report
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Shanghai Zhibang Valve Manufacture Co., Ltd. (established in 2016, ISO9001 certified) is a professional manufacturer specializing in high-performance industrial valves. Our Marine Ductile Iron Dual Plate Check Valve is specifically engineered for demanding marine and offshore environments. With CCS (China Classification Society) certification, a 24-month warranty, and a detailed Mill Test Report, this valve delivers reliable backflow prevention and long-term durability. Backed by an annual export value of US$1 – US$1.5 million, we supply to over 20 countries including North America, Europe, Southeast Asia, and the Middle East.
The dual-plate design offers a compact, lightweight solution that minimizes pressure loss and reduces water hammer. Made from ductile iron with stainless steel disc options, the valve withstands corrosive seawater, saline atmospheres, and high-pressure systems. Each unit undergoes rigorous testing and comes with a Mill Test Report for full traceability.
Key Features & Benefits
- Dual Plate Design – Fast closing action reduces reverse flow and water hammer, protecting piping systems.
- Ductile Iron Body – High tensile strength and excellent corrosion resistance for marine use.
- CCS Certified – Meets stringent requirements of China Classification Society for shipboard applications.
- 24-Month Warranty – Covers manufacturing defects, giving you peace of mind.
- Mill Test Report Included – Provides chemical composition, mechanical properties, and pressure test data.
- Low Pressure Drop – Streamlined flow path ensures minimal energy loss.
- Maintenance-Free Operation – Self-cleaning design with no external moving parts.
- Customizable Options – Disc materials (SS316, Duplex), seat elastomers (NBR, EPDM, Viton), and connection types (wafer, lug) available.
Technical Specifications
| Parameter | Value |
|---|---|
| Body Material | Ductile Iron (GGG40/GGG50) |
| Disc Material | Stainless Steel (CF8M, SS316 or Duplex upon request) |
| Seat Material | NBR, EPDM, or Viton (customizable) |
| Pressure Rating | PN10 – PN40 (150# – 300#) |
| Size Range | DN50 – DN600 (2″ – 24″) |
| Connection Standard | Wafer or Lug (ASME B16.5 / EN 1092) |
| Temperature Range | -20°C to +120°C (higher with special materials) |
| Certification | CCS, ISO9001 (other classification available on request) |
| Warranty | 24 months |
Why Choose Our Marine Check Valve?
This dual plate check valve is designed to operate in seawater cooling systems, ballast water lines, fire-fighting systems, and oil transfer piping on ships and offshore platforms. The ductile iron body provides excellent strength-to-weight ratio, reducing installation costs. The CCS certification ensures compliance with international maritime safety standards.
Customers benefit from:
- Reduced downtime – reliable sealing prevents leakage even under extreme pressure fluctuations.
- Lower total cost of ownership – minimal maintenance and long service life.
- Full documentation – Mill Test Report and material certificates accompany every shipment.
- Global logistics – shipped from Shanghai, Guangzhou, Hong Kong, or Beijing ports.
As a factory with ISO9001 quality management and CCS type approval, we produce each valve under strict quality control. Our annual export value of US$1 – US$1.5 million reflects trusted partnerships with clients from North America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. We offer competitive pricing, prompt delivery, and after-sales technical support.
Choose Zhibang Valve for your marine check valve needs. Contact us today for a quote or to discuss custom requirements. Your satisfaction is backed by our 24-month warranty and extensive industry experience.
Frequently Asked Questions (FAQ)
Q1: Is this check valve suitable for seawater applications?
Yes. The ductile iron body with stainless steel disc (SS316 or Duplex) and NBR/EPDM seat is specifically designed for seawater and brackish water. Optional coatings are available for extra corrosion protection.
Q2: What certifications are included?
The valve comes with CCS (China Classification Society) type approval certificate and a Mill Test Report. ISO9001 certification applies to our factory. Other marine classification (DNV, ABS, LR, etc.) can be arranged upon request.
Q3: What is the warranty period?
We offer a standard 24-month warranty against manufacturing defects. Extended warranty options are available for large projects.
Q4: What sizes and pressure ratings are available?
Standard sizes range from DN50 to DN600 (2″ – 24″) with pressure ratings from PN10 to PN40. Custom sizes and higher pressure ratings (e.g., PN63) can be manufactured with lead time.
Q5: Can I get a sample before bulk order?
Yes, sample orders are accepted. We can produce a prototype with your specifications and provide a Mill Test Report for verification.
Q6: What is the typical lead time?
For standard sizes in stock, delivery within 7–15 days. For custom orders, lead time is 25–45 days depending on quantity and complexity.
Q7: Do you provide installation and maintenance instructions?
Yes. Each valve is shipped with an instruction manual covering proper installation orientation (horizontal or vertical), torque values for bolting, and maintenance guidelines.
Q8: How is the Mill Test Report provided?
The report is included in the shipping documents. It contains chemical analysis, tensile test results, hardness test, and hydrostatic test data for the specific valve batch.
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