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Help CenterHigh Strength Ductile Iron Dual Plate Check Valve for Marine PN16 Wafer Connection Epoxy Coated
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly introduces our High Strength Ductile Iron Dual Plate Check Valve, specifically engineered for demanding marine applications. With a PN16 rating, wafer connection design, and an epoxy-coated finish, this valve offers exceptional durability against corrosion and high-pressure conditions. Since 2016, our factory has delivered over 50,000 valves worldwide, backed by ISO9001 quality management system and annual export value exceeding US$1 million. This check valve is designed to prevent backflow efficiently in seawater piping systems, ballast water lines, and cooling water circuits, ensuring reliable operation in the harshest marine environments.
Our dual plate check valve combines the strength of ductile iron with a streamlined wafer design, resulting in a lightweight yet high-strength solution that saves installation space and reduces piping stress. The epoxy coating (both internal and external) provides superior protection against corrosion, making it ideal for brackish water, treated sewage, and industrial effluents. Each valve undergoes rigorous pressure testing and spot-checking to meet international marine standards, giving you peace of mind on every voyage.
Key Features & Technical Specifications
- Body Material: High-strength ductile iron (GJS400/GGG40) – tensile strength ≥400 MPa, elongation ≥12%.
- Pressure Class: PN16 (max. 16 bar at ambient temperature) – also available PN10/PN25 upon request.
- Connection Type: Wafer style (face-to-face dimensions per API 594 or EN 558) – easy to install between flanges without additional supports.
- Disc Design: Dual spring-loaded plates – provide fast closing action, minimizing water hammer and pressure surges.
- Seat Material: NBR (Buna-N) – suitable for oil/water mixtures, with optional EPDM or FKM for aggressive media.
- Coating: Epoxy (fusion-bonded) – minimum thickness 250 microns, salt spray resistance over 720 hours.
- Temperature Range: -20°C to +120°C (with NBR seat).
- Application Areas: Marine (ballast water, seawater cooling, firefighting), shipbuilding, desalination plants, offshore platforms, water treatment, HVAC, and general industrial pipelines.
| Parameter | Value |
|---|---|
| Nominal Diameter (DN) | 150 |
| Max Operating Pressure | 16 bar @ 20°C |
| Body Test Pressure | 24 bar (water) |
| Seat Test Pressure | 17.6 bar |
| Face-to-Face Dimension | 56 mm (API 594 Table 1) |
| Weight (approx.) | 12.5 kg |
Why Choose Shanghai Zhibang’s Dual Plate Check Valve?
- Superior Mechanical Strength: Ductile iron body withstands high water hammer forces, ensuring long service life in marine cyclic systems.
- Corrosion Resistance: Fusion-bonded epoxy coating (FDA-approved for potable water) resists chlorides, sulfides, and UV exposure – perfect for ballast water tanks.
- Efficient Fluid Dynamics: Streamlined dual-plate design reduces pressure drop by up to 30% compared to conventional swing check valves, saving pumping energy.
- Low Maintenance: No internal hinges or pins that could wear; seat replacement is simple with two halves bolted together.
- Custom Options: Available in sizes DN50–DN600, with different seat materials (EPDM, FKM, PTFE), and optional VCI anti-corrosion packaging for long overseas transit.
As a dedicated manufacturer with ISO9001 certification, Shanghai Zhibang Valve ensures every dual plate check valve is individually pressure-tested and inspected before dispatch. Our valves have been installed on ships built to ABS, DNV, and CCS standards, and are widely used in marine fleets operating in North America, Europe, and Southeast Asia. With annual exports reaching US$1.5 million, we serve both OEM and aftermarket clients with prompt delivery from Shanghai, Guangzhou, or Hong Kong ports.
We understand that valve failure at sea is unacceptable. That’s why each unit comes with a 12-month warranty against material defects, and our technical team is available 24/7 for installation guidance or troubleshooting. Contact us today for a quote on your specific PN16 wafer check valve requirements – let our expertise protect your marine operations.
Frequently Asked Questions (FAQ)
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Q: What materials are used for the discs and springs?
A: Discs are made of ductile iron (same as body) or optional stainless steel (SS304/316). Springs are stainless steel (AISI 301) for corrosion resistance. -
Q: Can this valve be used for seawater applications?
A: Yes, the epoxy coating and NBR seat are suitable for seawater. For high salinity or S&W conditions, we recommend FKM seat and optional anti-corrosion disc coating. -
Q: What is the minimum working pressure for proper sealing?
A: The spring-loaded plates provide positive sealing even at near-zero backpressure. For low-pressure lines ( -
Q: Do you provide combined flanges (PN16/150#) for retrofit?
A: Yes, we offer custom face-to-face dimensions to suit both PN16 and Class 150 flanges. Please specify when ordering. -
Q: What is the typical lead time for a DN200 PN16 valve?
A: For standard sizes (DN50–DN300), lead time is 15–20 working days. Larger or non-standard orders may take 30–45 days, depending on quantity. -
Q: Is the coating suitable for potable water systems?
A: Yes, our epoxy coating is formulated to meet NSF/ANSI 61 standards for drinking water. A certificate of compliance can be provided upon request. -
Q: How do you test the valve before shipment?
A: Each valve undergoes a shell hydrostatic test at 1.5× rated pressure and a 10-minute seat leakage test at 1.1× rated pressure. Test records are included with the shipment. -
Q: Can I get a sample before bulk order?
A: Absolutely. Sample orders are welcome; cost will be deducted from the first bulk order. We can also arrange third-party inspection (e.g., SGS, BV) at buyer’s cost.
Experience the durability of Shanghai Zhibang's dual plate check valves – trusted by shipyards and marine engineers worldwide. With rigorous quality control and competitive pricing, we ensure your piping systems operate safely and efficiently. Request your customized PN16 wafer check valve now by contacting our sales team at [email protected] or WeChat +86-136XXXXXXXX.
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