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Help CenterWafer Type Dual Plate Check Valve for Marine, Cast Steel Body, Stainless Steel Disc, PN16-40
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Welcome to Shanghai Zhibang Valve Manufacture Co., Ltd. – your trusted partner in fluid control solutions. As a professional manufacturer established in 2016, we specialize in producing high-quality industrial valves for global markets. Our Wafer Type Dual Plate Check Valve for Marine, Cast Steel Body, Stainless Steel Disc, PN16-40 represents a perfect balance of robust engineering and cost-efficiency. Designed specifically for marine applications, this valve ensures reliable backflow prevention, minimal pressure drop, and exceptional durability even in harsh seawater environments. With annual exports exceeding US$1 million and a presence across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East, we take pride in delivering products that meet international standards.
The wafer-type dual plate check valve is an advanced non-return valve that uses two spring-loaded plates to close automatically when flow reverses. Compared to traditional swing check valves, it offers a shorter face-to-face dimension, lighter weight, and lower installation cost. The cast steel body provides high strength and corrosion resistance, while the stainless steel disc ensures long service life in marine settings. Our valves are rated PN16 to PN40, covering a wide range of pressure requirements.
Key Features & Technical Specifications
- Compact Design: Wafer-type installation between flanges saves space and reduces piping weight.
- Dual Plate Mechanism: Two spring-loaded plates ensure rapid closure, minimizing water hammer and noise.
- Durable Materials: Cast steel body (ASTM A216 WCB or equivalent) with stainless steel disc (SS304 or SS316) resists corrosion from seawater and chemicals.
- Wide Pressure Range: Available in PN16, PN25, PN40 (Class 150 to Class 300) to suit various system pressures.
- Low Pressure Drop: Streamlined flow path reduces energy loss, making it ideal for pumping systems.
- Easy Maintenance: No external moving parts; all internal components are serviceable without removing the valve from the pipeline.
- Versatile Applications: Suitable for water, oil, gas, and steam lines in marine, shipbuilding, offshore, and industrial systems.
Technical Parameters (Typical Range)
| Parameter | Value |
|---|---|
| Nominal Diameter (DN) | DN50 – DN600 (2" – 24") |
| Pressure Rating | PN16 / PN25 / PN40 (Class 150 / 300) |
| Body Material | Cast Steel (ASTM A216 WCB / WCC) |
| Disc Material | Stainless Steel (SS304 / SS316 / SS316L) |
| Seat Material | Stainless Steel / Hard Faced Stellite (Optional) |
| Spring Material | Inconel / Stainless Steel |
| Temperature Range | -20°C to +350°C (Options for higher/lower) |
| Connection Standard | Wafer type per API 594 / ASME B16.5 / EN 1092-1 |
| Operating Fluid | Water, Oil, Gas, Steam, Seawater |
Advantages for Marine & Industrial Use
- Space Saving: The wafer design fits snugly between flanges, reducing installation footprint by up to 50% compared to swing check valves.
- Reduced Water Hammer: The dual disc springs close instantly upon flow reversal, preventing pressure surges that can damage piping and equipment.
- Corrosion Resistance: Stainless steel disc and optional stainless steel seat provide excellent resistance to seawater and acidic fluids, extending valve life in marine environments.
- Cost Effective: Lower material usage and simpler installation lower total ownership cost without compromising performance.
- Low Maintenance: Simple construction with only a few moving parts means fewer failures and easier upkeep. The valve can be fully serviced in-line.
- Wide Applicability: Suitable for both horizontal and vertical pipelines (flow upward orientation).
Whether you are building a new vessel, upgrading an offshore platform, or maintaining a coastal industrial plant, our wafer dual plate check valve delivers reliable, long-lasting performance. We offer customization options such as different disc materials (SS316, duplex), special coatings, and extended temperature ranges to meet specific project requirements.
Why Choose Shanghai Zhibang Valve?
Since our founding in 2016, we have dedicated ourselves to manufacturing valves that exceed industry expectations. Our factory is ISO9001 certified, ensuring strict quality control at every stage – from raw material inspection to final pressure testing. We ship from major Chinese ports (Shanghai, Guangzhou, Hong Kong, Beijing) and have served over 30 countries across North America, South America, Europe, Africa, Oceania, and Asia. With annual export revenues of US$1 million to US$1.5 million, we have built a reputation for on-time delivery, competitive pricing, and responsive after-sales support. Our team of experienced engineers is ready to assist with technical questions and provide customized solutions. Contact us today for a quotation or more information – let us be your reliable valve supplier for marine and industrial applications.
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 plates that close faster, reducing water hammer and allowing wafer installation (compact). Swing check valves have a single heavy disc that swings open, requiring more space and creating more pressure drop.
Q2: Can this valve be used in vertical pipelines?
A: Yes, the dual plate check valve can be installed in vertical lines with upward flow. The spring mechanism ensures proper closure even in vertical orientation.
Q3: What materials are suitable for seawater applications?
A: For seawater, we recommend stainless steel disc (SS316 or duplex) combined with a stainless steel or hard-faced seat. The cast steel body can be epoxy-coated for extra protection. We offer these options upon request.
Q4: What are the standard face-to-face dimensions?
A: Our valves conform to API 594 and ASME B16.10 face-to-face dimensions for wafer dual plate check valves. Please provide the size and pressure class for exact dimensions.
Q5: Do you provide pressure test certificates?
A: Yes, each valve is hydrostatically tested per API 598 and we issue a test certificate. Additional NDT (UT, MT) can be arranged upon request.
Q6: What is the minimum order quantity (MOQ)?
A: We have flexible MOQ – typically 1 piece for small sizes, but we can accommodate trial orders. For standard sizes and materials, we maintain stock for quick delivery.
Q7: How long is the warranty period?
A: We offer a standard 12-month warranty from the date of shipment against defects in material and workmanship. Extended warranty options are available on request.
Q8: Can I get a customized pressure rating (e.g., PN63)?
A: While standard ratings are PN16-PN40, we can design custom valves for higher pressures. Please contact our sales team with your specific requirements.
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