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Marine Double Eccentric Butterfly Valve for Seawater Cooling and Ballast Systems
Product Spotlights
Specifically engineered for harsh marine environments, this double eccentric butterfly valve ensures bubble-tight sealing and long life in seawater cooling and ballast systems. Its offset design minimizes seat wear, offers low operating torque, and supports bidirectional flow. Constructed from corrosion-resistant marine-grade materials, it reduces maintenance and lifecycle costs while meeting international standards for shipbuilding applications.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Application:
Other, Seawater Cooling and Ballast Systems
Type:
Double Eccentric Butterfly Valve
Body Material:
Cast Steel, Duplex Stainless Steel, Nickel Aluminum Bronze
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Application
Other, Seawater Cooling and Ballast Systems
Type
Double Eccentric Butterfly Valve
Body Material
Cast Steel, Duplex Stainless Steel, Nickel Aluminum Bronze
Disc Material
316 Stainless Steel, Duplex Stainless Steel
Seat Material
EPDM, NBR, PTFE, or Metal Seats
Size Range
DN50 to DN1200 (2“ to 48“)
Pressure Rating
PN10/16, Class 150/300
Operation Type
Manual Gear, Electric Actuator, Pneumatic Actuator
Connection Type
Wafer, Lug, Flanged
Standards
ISO, API, DIN, JIS, GB
As a professional valve manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our specialized Marine Double Eccentric Butterfly Valve. Designed specifically for the demanding environments of seawater cooling and ballast systems, this valve offers superior sealing performance, exceptional corrosion resistance, and long-term operational reliability. Our years of expertise since 2016 in serving global maritime markets ensure that this product meets the stringent requirements of shipbuilding and offshore applications.
The core innovation lies in its double eccentric (double-offset) design. Unlike concentric butterfly valves, the disc's shaft is offset from both the centerline of the valve body and the seat centerline. This geometry minimizes wear by ensuring the disc only contacts the seat during the final degrees of closure, significantly extending service life, especially in abrasive seawater applications.
Key Product Features & Technical Advantages:
- Superior Sealing for Critical Systems: Provides bubble-tight shut-off even after prolonged cycling, crucial for ballast control and cooling circuit isolation.
- Enhanced Corrosion & Erosion Resistance: Available in a range of marine-grade materials like Duplex Stainless Steel and Nickel Aluminum Bronze to withstand chlorides, sulfates, and abrasive particles in seawater.
- Low Torque & Easy Operation: The eccentric design reduces operating torque by up to 60% compared to concentric valves, allowing for smaller, more cost-effective actuators and smoother manual operation.
- Bidirectional Sealing Capability: Engineered to seal effectively against pressure from either direction, providing flexible installation in complex piping layouts.
- Minimal Maintenance: The wear-compensating seat design and robust construction reduce the need for frequent adjustments or replacements, lowering total lifecycle costs.
- Compact & Lightweight Design: Offers significant space and weight savings compared to gate or globe valves, a critical factor in ship design.
Technical Specifications & Configuration Options:
| Parameter | Specification / Option |
| Design Standard | ISO 10631, API 609, DIN 3354, JIS B 2024, GB/T 12238 |
| Size Range (Nominal Diameter) | DN50 to DN1200 (2" to 48") |
| Pressure Rating | PN10, PN16 / Class 150, Class 300 |
| Temperature Range | -20°C to +200°C (depending on seat material) |
| Body Material (Typical) | WCB, CF8M (316SS), Duplex 2205, C95800 (NiAl Bronze) |
| Disc Material (Typical) | 316 Stainless Steel, Duplex Stainless Steel, Coated Carbon Steel |
| Seat Material | EPDM, NBR, PTFE, Metal Seat (Stainless Steel) |
| Operation | Manual Lever, Manual Gearbox, Electric Actuator, Pneumatic Actuator |
| End Connection | Wafer, Lug, Double Flanged |
Benefits for Your Marine Operations:
- System Integrity: Reliable isolation prevents cross-contamination between ballast tanks and ensures efficient cooling system performance.
- Reduced Downtime: Durable construction and easy maintenance access contribute to higher system availability and lower repair costs.
- Operational Safety: Positive sealing under varying pressures enhances the safety of ballast operations and critical cooling circuits.
- Cost Efficiency: Lower initial cost than gate valves, combined with reduced maintenance and actuator costs, delivers an excellent return on investment.
Shanghai Zhibang's commitment to quality is backed by our ISO9001 certification and proven track record of exporting to major markets worldwide, including North America, Europe, Southeast Asia, and the Middle East. With an annual export value ranging between US$1-1.5 Million, we have established trust with shipyards, marine engineers, and system integrators globally. Our strategic location with multiple shipment ports (Shanghai, Guangzhou, Hong Kong, Beijing) ensures flexible and timely logistics. Choose our Marine Double Eccentric Butterfly Valve to equip your vessels with a component known for its durability, performance, and value—contact us today for a detailed quotation or technical consultation.
Frequently Asked Questions (FAQ)
-
Q: Why choose a double eccentric design over a standard concentric butterfly valve for seawater?
A: The double eccentric design drastically reduces wear on the seat because the disc cam-action lifts away from the seat during operation. This is critical in seawater with abrasive particles, leading to a much longer service life and more reliable sealing. -
Q: What is the most suitable seat material for chlorinated seawater service?
A: For typical seawater temperatures, EPDM offers good chemical resistance. For higher temperatures or more demanding services, PTFE or specially formulated polymers are recommended. Metal seats are available for high-temperature or fire-safe applications. -
Q: Can this valve be used for both ballast tank filling/emptying and cooling water supply?
A: Yes, its bidirectional sealing capability and corrosion-resistant material options make it suitable for both applications. However, material selection (e.g., bronze vs. stainless steel) should be optimized based on the specific fluid velocity and debris content. -
Q: Are electric or pneumatic actuators available, and can they be fitted locally?
A: Yes, we offer a range of compatible electric and pneumatic actuators. They can be supplied mounted and tested at our factory, or the valve can be supplied separately for local actuator fitting, depending on your preference and project requirements. -
Q: What standards do your marine butterfly valves comply with?
A: Our valves are manufactured to international standards including ISO, API, DIN, JIS, and GB. Specific certification documentation is available upon request. -
Q: What is the typical delivery lead time for a custom-sized valve?
A: Lead times vary based on size, material, and quantity. Standard sizes are often available from stock. For custom orders, a typical lead time ranges from 4 to 8 weeks. We provide accurate timelines upon order confirmation. -
Q: Do you provide testing certificates for the valves?
A> Yes, we can provide standard factory test reports (e.g., shell test, seat test). More comprehensive testing, such as according to specific classification society rules (e.g., ABS, DNV, LR), can be arranged upon request. -
Q: How do I select the correct material combination for my application?
A> Our technical team can assist you. Key factors include seawater temperature, flow velocity, presence of sand/silt, required pressure class, and any specific classification society material guidelines for your project.
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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