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Help CenterCast Iron Marine Dual Plate Check Valve for Compressed Air, DN50-DN200, PN1.0-1.6MPa, Wafer, Rubber Seal, CCS Certified
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Shanghai Zhibang Valve Manufacture Co., Ltd. (established 2016) is a professional manufacturer of industrial valves with annual export value of US$1-1.5 million. Our cast iron marine dual plate check valve is specifically engineered for compressed air systems on ships and offshore platforms. Combining robust cast iron body with dual spring-loaded plates and rubber seal, this valve ensures reliable backflow prevention, low pressure drop, and easy wafer installation between flanges. With CCS certification and ISO9001 quality system, it meets the highest marine industry standards.
This valve is available in sizes DN50 to DN200 and pressure ratings PN1.0 to PN1.6 MPa. The compact wafer design reduces weight and installation space, making it ideal for confined marine piping. Rubber sealing ensures bubble-tight shut-off even under low pressure conditions. Below are the key technical specifications:
| Parameter | Value |
|---|---|
| Body Material | Cast Iron (GG25) |
| Disc Material | Stainless Steel (SS304/SS316 optional) |
| Seal Material | NBR (standard) / EPDM / Viton (optional) |
| Operating Temperature | -10°C to +80°C (standard rubber) |
| Design Standard | API 594 / BS EN 1868 |
| Flange Standard | ANSI B16.5 / DIN 2501 / JIS B2210 |
Product Features & Benefits
- Dual Plate Design: Two spring-loaded discs close quickly to prevent water hammer, offering quiet and reliable operation even in vertical or horizontal pipelines.
- Wafer Type Construction: Compact and lightweight, installed between two flanges without dedicated support brackets, saving space and cost.
- Rubber Sealing: Soft seal ensures zero leakage at low pressure differentials, essential for compressed air systems where backflow could cause contamination.
- Cast Iron Body: Durable and corrosion-resistant for marine environments; optional epoxy coating available for extra protection.
- Full Port Design: Low flow resistance (pressure drop comparable to gate valve) reduces energy consumption in compressed air networks.
- Easy Maintenance: Cartridge-type internal assembly allows disc and spring replacement without removing the entire valve from the pipeline.
- Wide Size and Pressure Range: DN50 to DN200, PN1.0 to PN1.6 MPa cover most marine compressed air applications.
Why Choose Shanghai Zhibang Valve?
As a direct manufacturer with ISO9001 certification, we control every step from casting to final assembly. Our factory in Shanghai has been producing valves since 2016, exporting to over 20 countries including North America, Europe, and Southeast Asia. We have supplied valves for numerous marine projects—our CCS-certified dual plate check valves are trusted by shipyards and engineering companies. With prompt shipment from Shanghai, Guangzhou, Hong Kong, or Beijing ports, you can expect timely delivery. Our annual export value of US$1-1.5 million reflects our commitment to quality and customer satisfaction. Contact us today for a competitive quote and technical support!
Frequently Asked Questions
- Q: Can this valve be used for seawater applications? A: The standard cast iron body with rubber seal is suitable for compressed air and non-corrosive fluids. For seawater, we recommend upgrading to ductile iron or bronze with EPDM seal. Please consult our sales team for customized options.
- Q: Is the CCS certification valid for all sizes? A: Yes, our CCS certification covers the entire size range DN50-DN200 and pressure ratings PN1.0-PN1.6 MPa. We can provide the certification documents upon request.
- Q: What is the pressure drop across this valve at maximum flow? A: The pressure drop is very low due to the full port design. For a typical compressed air system, it is less than 0.02 MPa at DN100. Detailed CV charts are available in our technical datasheet.
- Q: Can I install this valve vertically with downward flow? A: Yes, the dual spring-loaded plates allow installation in any orientation. For vertical lines with downward flow, the springs ensure discs close against gravity, preventing backflow.
- Q: What is the sealing performance at very low pressure (e.g., 0.05 MPa)? A: Our rubber seal provides bubble-tight shut-off even at differential pressure as low as 0.01 MPa. This makes it ideal for compressed air systems where even slight leakage is unacceptable.
- Q: Do you offer custom flange drilling patterns? A: Yes, we can customize facing and drilling according to your flange standard (ANSI, DIN, JIS, etc.). Please specify your requirements when ordering.
- Q: What is the lead time for a typical order? A: For standard sizes (DN50-DN150) in stock, lead time is 7-10 days. For larger sizes or special materials, it is 15-25 days. We can arrange express delivery if needed.
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