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Help CenterMarine Cast Iron Dual Plate Check Valve DN50-DN600 PN1.0-1.6MPa Stainless Steel Disc EPDM Seal Wafer Connection
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our high-performance Marine Cast Iron Dual Plate Check Valve in sizes DN50 to DN600, with pressure ratings PN1.0 to PN1.6 MPa. Designed specifically for demanding marine environments, this valve combines a robust cast iron body with a stainless steel disc and EPDM seal, ensuring reliable backflow prevention and long service life. Our wafer-style connection simplifies installation between flanges, reducing space and weight compared to traditional swing check valves. As an ISO9001-certified manufacturer with over 8 years of experience exporting globally, we guarantee precision engineering and strict quality control for every valve delivered.
The dual-plate design offers a compact profile and quick closing action, minimizing water hammer and protecting downstream equipment. The stainless steel disc resists corrosion in saltwater and chemical-laden fluids, while the EPDM seal provides excellent sealing performance against water, oils, and mild acids. Whether used in shipbuilding, offshore platforms, or coastal water treatment facilities, this check valve delivers dependable operation under high flow and pressure variations.
Key Features & Technical Specifications
- Body Material: Cast Iron (GG25 or equivalent) – high strength and corrosion resistance in marine environments.
- Disc Material: Stainless Steel (SS304/SS316) – excellent durability against seawater and chemicals.
- Seal Material: EPDM (Ethylene Propylene Diene Monomer) – superior elastic recovery and temperature resistance.
- Size Range: DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 – full range coverage.
- Pressure Ratings: PN1.0 MPa (10 bar) and PN1.6 MPa (16 bar) – suitable for standard marine piping systems.
- Connection: Wafer type between flanges (ASME B16.5, DIN or JIS flanges available upon request).
- Operating Temperature: -10°C to +80°C (EPDM seal). For higher temperature applications, optional NBR or FKM seals are available.
- Installation: Horizontal or vertical orientation – flexible mounting without special supports.
| Parameter | Value |
|---|---|
| Body Material | Cast Iron (GG25) |
| Disc Material | Stainless Steel (SS304 / SS316) |
| Seal Material | EPDM (optional NBR, FKM) |
| Size Range | DN50 - DN600 (2" - 24") |
| Pressure Rating | PN1.0 - PN1.6 MPa (10 - 16 bar) |
| Connection Type | Wafer (between flanges) |
| Temperature Range | -10°C to +80°C (EPDM) |
| Compliance | ISO9001:2015 |
Product Advantages & Customer Benefits
- Space-Saving Design: The wafer profile is up to 50% lighter and shorter than swing check valves, ideal for tight marine installations.
- Reduced Water Hammer: Dual plates close quickly with low pressure drop, mitigating surge effects on pipes and pumps.
- Corrosion Resistance: Stainless steel disc and optional SS316 variant provide excellent resistance to saltwater, chlorides, and acids.
- Low Maintenance: Non-seat design and self-centering disc minimize wear, extending service intervals.
- Versatile Installation: Can be mounted vertically or horizontally without special brackets, simplifying piping layouts.
- Customizable: Available with NPT threads, lug style, or special seal materials to meet unique marine or industrial requirements.
Trusted by global customers since 2016: Shanghai Zhibang Valve Manufacture Co., Ltd. has exported over US$1 million annually to markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. Our factory in Shanghai implements strict quality inspections from raw material procurement to final hydraulic testing, ensuring every valve meets ISO9001 standards. With flexible shipping from Shanghai, Guangzhou, Hong Kong, or Beijing ports, we offer competitive lead times and dedicated after-sales support.
For projects requiring reliable backflow prevention in marine systems, water treatment plants, HVAC, or oil and gas pipelines, our Cast Iron Dual Plate Check Valve is the optimal choice. Contact us today for a customized quotation or technical drawings. Experience the Zhibang Valve difference – robust performance, proven durability, and global service.
Frequently Asked Questions (FAQ)
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Q: What is the difference between a dual plate check valve and a swing check valve?
A: Dual plate check valves are more compact and lightweight, with faster closing action and lower pressure drop. They are ideal for space-constrained applications like marine piping, while swing checks require more space and are heavier. -
Q: Can this valve be used for seawater?
A: Yes, the cast iron body and stainless steel disc (especially SS316) are well-suited for seawater. EPDM seal offers excellent resistance to saltwater and ozone. For higher chloride environments, we recommend upgrading disc to SS316. -
Q: What is the maximum operating temperature with EPDM seal?
A: EPDM seal can operate from -10°C to +80°C continuously. For temperatures up to 120°C, we offer NBR (nitrile) as an alternative; for up to 200°C, FKM (Viton) is available upon request. -
Q: Is the valve suitable for vertical pipeline installation?
A: Absolutely. The dual plate design works effectively in both horizontal and vertical orientations, with or without gravity assistance. The spring-loaded plates ensure tight shut-off regardless of orientation. -
Q: What flange standards does this wafer valve match?
A: Standard valves are designed to fit between ASME B16.5 Class 150 flanges. We can also produce to DIN PN10/PN16, JIS 10K/16K, or other international standards. Please specify your flange standard when ordering. -
Q: Do you provide special disc materials like Duplex or Super Duplex?
A: Yes, for high-corrosion environments (e.g., offshore, chemical), we can supply discs in Duplex (2205) or Super Duplex (2507) stainless steel. Modifications are available with extended lead time. -
Q: What is the typical delivery time?
A: Standard sizes (DN50-DN300) are usually shipped within 15-25 working days after order confirmation. Larger sizes (DN350-DN600) may require 25-35 working days. Urgent orders can be expedited based on stock availability. -
Q: How can I get a sample or technical datasheet?
A: Please contact our sales team via the website or email. We provide free technical datasheets, drawings, and sample valves for qualified buyers (sample fee applies and refundable for bulk orders).
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