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Help CenterMarine Dual Plate Check Valve DN50-DN300 Cast Steel NBR Seal PN1.6-4.0MPa for Oil Systems
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Shanghai Zhibang Valve Manufacture Co., Ltd, established in 2016 with an annual export value of US$1-1.5 million, proudly presents our high-performance Marine Dual Plate Check Valve designed for demanding oil systems. Engineered from high-quality cast steel and featuring a durable NBR seal, this valve offers reliable backflow prevention across a wide pressure range of PN1.6 to 4.0 MPa. Our wafer-style check valve, available from DN50 to DN300, is precision-machined to meet rigorous marine and industrial standards, providing exceptional flow characteristics and long service life.
Each valve is manufactured under strict ISO9001 quality management, ensuring consistent performance in harsh environments. Whether you need to prevent reverse flow in fuel oil lines, lubricating oil circuits, or hydraulic systems, our dual plate check valve delivers low pressure drop, quiet operation, and minimal maintenance. With multiple shipping ports (Shanghai, Guangzhou, Hong Kong, Beijing) and a global customer base across North America, Europe, Asia, and Africa, we are your trusted partner for critical flow control solutions.
Product Features & Technical Specifications
- Robust Construction: Cast steel body (ASTM A216 WCB) provides high strength and corrosion resistance for marine and oil environments.
- Reliable Sealing: NBR (Nitrile) seat ensures excellent oil resistance, tight shut-off, and durability up to +80°C.
- Compact Wafer Design: Short face-to-face dimension saves space and weight, ideal for confined installations.
- Low Pressure Drop: Dual plates open fully with minimal flow resistance, reducing energy loss in pipelines.
- Non-Slam Operation: Spring-assisted closing prevents water hammer and noise, even in pulsating flow conditions.
- Easy Installation: Centering lugs or alignment features for correct positioning between flanges (RF or FF).
- Corrosion Protection: External coating available (epoxy or paint) upon request for additional protection.
| Parameter | Value |
| Size Range | DN50 – DN300 (2″ – 12″) |
| Pressure Rating | PN1.6 / PN2.5 / PN4.0 MPa |
| Body Material | Cast Steel (WCB) |
| Seal Material | NBR (Nitrile) |
| Face-to-Face | API 594 or BS 5153 (as specified) |
| Flange Drilling | EN 1092-1 / ASME B16.5 (optional) |
| Max. Operating Temperature | 80°C (for NBR) |
| Application Medium | Oil, fuel, lubricants, hydraulic fluids |
Advantages for Your Oil Systems
Enhanced System Safety: The dual plate check valve prevents reverse flow that can damage pumps, compressors, and meters. Its spring-assisted closure ensures fast response even at low flow rates, reducing the risk of backflow in oil transfer lines.
Cost-Effective Operation: Low pressure drop across the valve means lower pumping costs over the lifetime of your system. The lightweight wafer design reduces support structure requirements and simplifies installation in existing pipelines.
Durability in Marine Environments: Cast steel body with optional protective coating resists saltwater corrosion, while NBR seal withstands oil degradation. This valve is suitable for shipboard fuel systems, offshore platforms, and refinery piping.
Customizable Options: We offer variations in seat material (e.g., Viton for higher temperature), pressure ratings, and flange standards. Contact our engineering team for tailor-made solutions that match your specific oil system requirements.
Why Choose Shanghai Zhibang Valve?
As an ISO9001 certified manufacturer since 2016, we have exported over US$1 million annually to more than 15 countries across North America, Europe, Asia, Africa, and Oceania. Our valve production is backed by rigorous quality control, including hydrostatic testing, shell testing, and seat leakage testing per API 598. Each valve is individually inspected before shipment from our Shanghai facility.
We understand the critical nature of oil system components and deliver products that meet international standards such as API 594, BS 5153, and EN 1092-1. With convenient shipping from Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to global ports. Our after-sales support includes technical documentation, installation guidance, and a one-year warranty against manufacturing defects.
Take the next step toward reliable flow control. Contact us today for a quotation or technical consultation. Our team will help you select the optimal marine dual plate check valve for your oil system, ensuring safety, efficiency, and long-term value.
Frequently Asked Questions (FAQ)
Q1: What is the difference between a dual plate check valve and a swing check valve?
A: A dual plate check valve uses two spring-loaded half-discs that open when flow is forward and close quickly when flow reverses. It has a shorter face-to-face dimension, lighter weight, and lower pressure drop compared to a swing check valve, making it ideal for tight spaces and low-pressure systems.
Q2: Can this valve be used for high-viscosity oils?
A: Yes, the dual plate design offers relatively low cracking pressure and the NBR seal is compatible with many petroleum-based oils. For extremely viscous or abrasive fluids, we recommend consulting our technical team for a custom material selection.
Q3: What is the standard flange connection for this valve?
A: The valve is designed for wafer installation between flanges. Standard drilling patterns follow EN 1092-1 for PN ratings. ASME B16.5 Class 150/300 drilling is available upon request. Please specify your flange standard when ordering.
Q4: Is the NBR seal suitable for seawater or salt spray?
A: NBR is not recommended for direct seawater contact; however, the cast steel body can be epoxy-coated for marine environments. For sealing in seawater systems, consider an alternative seal material (Viton or EPDM). Contact us for advice.
Q5: How do you test the valve before shipment?
A: Each valve undergoes a shell hydrostatic test at 1.5 times the rated pressure and a seat leakage test (air or water) per API 598. A test certificate is provided with each order.
Q6: What is the typical lead time for DN150 or larger sizes?
A: Standard sizes DN50-DN200 are often in stock. For larger sizes (DN250-DN300) or special materials, lead time is typically 15-30 working days, depending on quantity and customization requirements.
Q7: Can I get a sample before placing a bulk order?
A: Yes, we provide sample orders for evaluation. Sample cost and shipping are negotiable, and we will deduct the sample cost from future bulk orders. Minimum order quantity for custom sizes may apply.
Q8: Do you offer technical support for installation?
A: Absolutely. Our sales engineers can provide installation drawings, operation manuals, and remote guidance. For large projects, on-site support can be arranged upon request.
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