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Home > Industrial Equipment & Components > Valve > Check Valve > Marine Large Diameter Dual Plate Check Valve DN300-DN600 With Mill Test Report and 12-Month Warranty
Marine Large Diameter Dual Plate Check Valve DN300-DN600 With Mill Test Report and 12-Month Warranty
Product Spotlights
ISO9001 manufacturer providing marine large diameter dual plate check valves DN300-DN600 with Mill Test Report and 12-month warranty. Features low pressure drop, minimal water hammer, wafer style for easy installation, and corrosion-resistant materials. Trusted by global shipyards and backed by US$1–US$1.5 million annual exports.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Material:
Other, Cast Iron / Ductile Iron / Carbon Steel (customizable)
Application:
Other, Marine industry
Standard:
Other, Design to API 594 / BS EN 16767, manufactured under ISO9001
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Material
Other, Cast Iron / Ductile Iron / Carbon Steel (customizable)
Application
Other, Marine industry
Standard
Other, Design to API 594 / BS EN 16767, manufactured under ISO9001
Size Range
DN300 to DN600
Valve Type
Dual Plate Check Valve
End Connection
Wafer type (available with lug or flanged on request)
Working Pressure
PN10, PN16, PN25 (available upon request)
Temperature Range
-20°C to +120°C (optional high-temperature version)
Warranty
12 months
Test Report
Mill test report provided with each valve
Shanghai Zhibang Valve Manufacture Co., Ltd proudly presents our Marine Large Diameter Dual Plate Check Valve in sizes DN300 to DN600. As an ISO9001-certified manufacturer established in 2016, we specialize in producing high-performance valves for demanding marine environments. Each valve is delivered with a Mill Test Report and backed by a 12-Month Warranty, ensuring reliability and compliance with international standards. Our dual plate check valve is engineered to prevent backflow in large-bore piping systems, reducing water hammer and minimizing pressure drop – essential for ballast water, cooling water, and seawater intake applications on ships and offshore platforms.
Product Features & Technical Specifications
- Dual Plate Design: Two spring-loaded plates close quickly against reverse flow, reducing slamming and water hammer. Ideal for high-velocity pipelines.
- Large Diameter Range: Manufactured in DN300, DN350, DN400, DN450, DN500, DN550, and DN600 to fit major marine pipeline systems.
- Robust Materials: Standard construction in ductile iron (ASTM A536) or carbon steel (WCB), with optional stainless steel plates for seawater corrosion resistance. Seat materials include EPDM, NBR, or Viton® based on fluid compatibility.
- Compact Wafer Style: Lightweight and easy to install between flanges, saving space and reducing support structure requirements.
-
Performance Parameters:
Size DN300 – DN600 Pressure Rating PN10 / PN16 / PN25 (customizable up to Class 150) Temperature Range -20°C to +120°C (seawater service); higher temp versions on request Flange Standard DIN / EN 1092, ANSI B16.5, or JIS B2220 Design Standard API 594, BS EN 16767 Testing Hydrostatic shell test, seat leakage test per API 598 - Mill Test Report: Each valve is supplied with a comprehensive MTR covering chemical composition, mechanical properties, and dimensional inspection, ensuring full traceability.
- 12-Month Warranty: We stand behind our product quality with a one-year warranty against defects in material and workmanship.
- Optional Features: Available with lever and weight, counterweight, or dashpot for controlled closing; NACE MR0175 compliance on request.
Customer Benefits
- Minimized Water Hammer: The dual plate design with torsion spring ensures rapid closing, protecting pumps and pipelines from damaging pressure surges.
- Low Pressure Drop: Streamlined plates and full bore design result in lower head loss compared to swing check valves, reducing energy consumption.
- Easy Installation & Maintenance: Wafer style allows direct mounting between flanges without additional supports; no special tools required for servicing.
- Corrosion Resistance for Marine Use: Materials selected specifically for seawater, brackish water, and aggressive fluids – extended service life in harsh environments.
- Global Compliance: Meets international standards, making it suitable for newbuild and retrofit projects in shipyards worldwide.
Company Strength & Trust-Backed Assurance
Shanghai Zhibang Valve Manufacture Co., Ltd has been a dedicated valve manufacturer since 2016, with an annual export value of USD 1 million to USD 1.5 million. Our products are shipped from major Chinese ports (Shanghai, Guangzhou, Hong Kong, Beijing) to markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. We hold the ISO9001 quality management system certification, ensuring consistent product quality and process control. Every Marine Large Diameter Dual Plate Check Valve undergoes rigorous inspection, and we provide a Mill Test Report for full material traceability. With a 12-month warranty and responsive after-sales support, you can buy with confidence. Experience reliable backflow prevention for your maritime operations – contact us today for a quotation or technical discussion.
Frequently Asked Questions (FAQ)
- Q: What is the maximum size you can manufacture for this dual plate check valve? A: Our standard range is DN300 to DN600. For custom sizes up to DN800, please inquire with our sales team.
- Q: Do you provide the valve with flanged ends or only wafer type? A: The standard version is wafer type for compact installation. Lug-type and flanged-end configurations are available on request, with delivery times depending on specifications.
- Q: Can the valve be used for saltwater (seawater) applications? A: Yes, we offer different material grades: ductile iron with epoxy coating is standard; stainless steel (316/316L) plates are recommended for long-term seawater exposure. Please specify your fluid conditions.
- Q: What does the Mill Test Report include? A: Each MTR covers chemical analysis of materials, tensile strength, yield strength, elongation, hardness, and dimensional inspection results. It is traceable to the heat number.
- Q: How long is the warranty period? A: We offer a 12-month warranty from the date of shipment against defects in material and workmanship under normal use and service conditions.
- Q: Which payment terms do you accept? A: We accept T/T (30% deposit, 70% before shipment) and L/C at sight. For established partners, other terms can be discussed.
- Q: What is the typical lead time for DN400 valves? A: Standard sizes (DN300–DN600) are usually delivered within 15–25 working days after confirming the order and receiving the deposit. Custom materials or coatings may require 30–40 days.
- Q: Do you have any third-party certification for marine use? A: While we are ISO9001 certified, specific marine classification certificates (e.g., DNV, Lloyds, ABS) can be arranged at an additional cost. Please advise your requirements when ordering.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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