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Home > Industrial Equipment & Components > Valve > Check Valve > Marine Duplex Check Valve, Factory Direct Price, Full Traceability, DN50-DN200, PN1.6-10MPa
Marine Duplex Check Valve, Factory Direct Price, Full Traceability, DN50-DN200, PN1.6-10MPa
Product Spotlights
Factory direct pricing with full traceability from DN50 to DN200, PN1.6–10MPa. Dual-plate design reduces water hammer; corrosion-resistant materials for marine systems. ISO9001 certified manufacturer with global shipping ports and 1M+ USD annual export. Customizable materials and classification society approvals available.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Material:
Other, Cast Iron / Ductile Iron / Stainless Steel (optional)
Size Range:
DN50 – DN200
Pressure Rating:
PN1.6 – PN10.0 MPa (150# – 600# available)
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 / Stainless Steel (optional)
Size Range
DN50 – DN200
Pressure Rating
PN1.6 – PN10.0 MPa (150# – 600# available)
Connection Type
Wafer / Flanged (customizable)
Applicable Medium
Sea water, fresh water, oil, gas, chemical fluids
Operating Temperature
-20°C to +80°C (higher on request)
Design Standard
API 594 / BS 5154 compliant
Model Series
ZB-MDCV Series
Brand
Shanghai Zhibang
Traceability
Full material & production traceability
Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in high-quality marine valves for global shipbuilders and offshore operators. Our Marine Duplex Check Valve is engineered to provide reliable backflow prevention in demanding seawater, oil, and gas systems. With a factory-direct pricing model and full traceability from raw material to finished product, we ensure that every valve meets rigorous marine standards while offering cost savings for B2B buyers.
Available in sizes from DN50 to DN200 and pressure ratings from PN1.6 to PN10.0 MPa (compatible with Class 150 to Class 600), this dual-plate check valve features a compact wafer design that minimizes space and weight in piping systems. The spring-loaded plates close quickly upon flow reversal, reducing water hammer and protecting downstream equipment. Whether for ballast systems, cooling water circuits, or fuel oil lines, our valve delivers consistent performance with minimal maintenance.
Key Features & Technical Specifications
- Dual Plate Design: Lightweight, short face-to-face length, easy to install between flanges.
- Full Traceability: Each valve has a unique serial number; material certificates and test reports are available upon request.
- Corrosion Resistance: Standard cast iron body with epoxy coating; stainless steel plates and springs optional for aggressive media.
- Low Pressure Drop: Streamlined disc profile minimizes turbulence and energy loss.
- Versatile Installation: Suitable for horizontal or vertical pipelines (upward flow).
- Factory Direct Price: No middlemen, competitive pricing for bulk orders and OEM projects.
| Parameter | Available Options |
|---|---|
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200 |
| Pressure Class (PN) | 1.6, 2.5, 4.0, 6.4, 10.0 MPa |
| Flange Standard | EN 1092-1, ASME B16.5 (custom) |
| Body Material | Cast Iron (GG25), Ductile Iron (GGG40), Stainless Steel (CF8/CF8M) |
| Plate Material | Ductile Iron + NBR coating, Stainless Steel 316 |
| Seal Material | NBR, EPDM, Viton (for high temperature/oil) |
| Spring Material | Stainless Steel 301/316 |
Why Choose Shanghai Zhibang’s Marine Duplex Check Valve?
- Cost Efficiency: As a direct manufacturer (established 2016), we eliminate distributor markups. Annual export value of US$1–1.5 million reflects competitive pricing and volume capability.
- Global Delivery: Convenient shipping ports in Shanghai, Guangzhou, Hong Kong, and Beijing—fast logistics to North America, Europe, Southeast Asia, Middle East, and Africa.
- Quality Assurance: Our factory is ISO9001 certified. Every valve undergoes hydrostatic and seat leakage testing before shipment. Full traceability documentation included.
- Versatility: Suitable for marine ballast, cooling water, firefighting, bilge, and cargo handling systems. Customizable materials for sour gas or high-temperature applications.
- Low Maintenance: Spring-assisted closure reduces wear; no external moving parts. Long service life even in continuous duty.
With presence in over 15 markets including domestic China, South America, Eastern Europe, and Oceania, Shanghai Zhibang has built a reputation for reliability and customer support. Our technical team provides sizing recommendations, installation guidance, and after-sales service.
Frequently Asked Questions
-
Q: What is the difference between a duplex check valve and a swing check valve?
A: A duplex (dual-plate) check valve has two spring-loaded plates that close rapidly, offering a shorter face-to-face length and lower weight. It reduces water hammer better than traditional swing checks, making it ideal for marine applications where space is limited. -
Q: Can this valve be used in vertical pipes?
A: Yes. Our marine duplex check valve is designed for both horizontal and vertical upward flow. For vertical downward flow, please consult our technical team for special spring selection. -
Q: What material do you recommend for seawater service?
A: For seawater, we typically recommend a ductile iron body with EPDM seals and stainless steel plates/springs (316SS). Epoxy coating provides additional corrosion protection. We can also provide full stainless steel construction upon request. -
Q: What documentation do you provide for traceability?
A: Each valve includes a unique serial number. We can supply material certificates (MTC), pressure test reports, and a certificate of conformity. Full traceability records are maintained for 10 years. -
Q: What is the delivery time for a standard order?
A: For common sizes (DN50–DN150) and standard materials, lead time is typically 15–25 working days after confirmation. Custom materials or larger quantities may require 30–40 days. We always confirm the schedule with you before production. -
Q: Do you offer valves with classification society approvals?
A: Yes, we can manufacture valves meeting requirements of major classification societies (DNV, LR, ABS, BV, CCS, etc.) as per customer specification. Please provide the required certification when inquiring. -
Q: How do you ensure the valve performs well under high flow velocity?
A: Our valve design features a streamlined disc profile and optimized spring force to minimize dynamic torque. Computational Fluid Dynamics (CFD) analysis is available for critical applications to ensure stable operation. -
Q: Can I get a sample valve for testing before bulk order?
A: Absolutely. We support sample orders for qualification. The sample price is factory cost plus shipping, and we will deduct part of it from your first bulk order. Please contact our sales team for details.
We are confident that Shanghai Zhibang’s Marine Duplex Check Valve will exceed your expectations in performance, price, and reliability. With our factory-direct model, full traceability, and ISO9001 quality system, you gain a partner who values long-term cooperation. Contact us today for a quotation or technical discussion—your marine systems deserve the best protection.
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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