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As a professional manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd specializes in producing high-performance industrial valves for demanding applications worldwide. Our Marine Double Eccentric Butterfly Valve represents our commitment to engineering excellence, specifically designed to withstand the harsh conditions of marine environments. With an annual export value reaching US$1-1.5 million and a presence across global markets from North America to Southeast Asia, we understand the critical requirements of shipbuilding and offshore industries. This valve comes complete with a comprehensive Mill Test Report and a robust Warranty, providing documented quality assurance and long-term reliability that marine operators can trust for their most critical fluid control applications.
The double eccentric design of this butterfly valve offers significant advantages over conventional valves in marine applications:
- Reduced Torque Operation: The offset shaft design minimizes friction during opening and closing, requiring less operating torque and extending actuator life.
- Bubble-Tight Sealing: Advanced sealing mechanisms ensure zero leakage even after prolonged operation in corrosive seawater environments.
- Extended Service Life: The eccentric design prevents seat wear by ensuring the disc lifts away from the seat before rotation begins.
- Bi-Directional Flow Capability: Engineered to handle flow in both directions with equal efficiency and sealing performance.
- Corrosion Resistance: Available with various protective coatings and material options specifically selected for saltwater exposure.
- Low Maintenance Design: Simplified construction with fewer wearing parts reduces maintenance requirements and downtime.
Our marine valves undergo rigorous testing to ensure they meet the demanding standards of ship classification societies and international marine regulations. The technical specifications vary based on configuration, but typical parameters include:
| Parameter | Standard Range | Custom Options |
| Size Range | DN50 to DN600 (2" to 24") | Up to DN1200 (48") available |
| Pressure Rating | PN16, Class 150 | PN10 to PN25, Class 150 to 300 |
| Body Materials | Cast Steel, Ductile Iron | Stainless Steel (316, 316L), Aluminum Bronze |
| Seat Materials | PTFE, EPDM | Metal Seated, Special Polymers |
| Operation Methods | Lever, Worm Gear | Electric, Pneumatic, Hydraulic Actuators |
| Temperature Range | -10°C to 120°C | -20°C to 200°C |
| Connection Types | Wafer, Lug | Double Flange, Special Marine Flanges |
The valve's construction features several design elements specifically optimized for marine service:
- Corrosion Protection: Multiple coating options including epoxy, galvanizing, or specialized marine coatings that resist saltwater corrosion.
- Stem Design: Stainless steel stem with double eccentric offset to ensure smooth operation and prevent binding.
- Disc Configuration:
- Disc Configuration: Streamlined disc design minimizes pressure drop and turbulence in fluid systems.
- Sealing System: Multiple sealing points with redundant protection against seawater intrusion.
- Mounting Flexibility: Compatible with various actuator types for integration into automated ship systems.
For shipbuilders and marine operators, choosing our Double Eccentric Butterfly Valve delivers tangible benefits:
- Reduced Operational Costs: Lower torque requirements mean smaller, more economical actuators and reduced energy consumption.
- Enhanced System Reliability: Proven performance in demanding marine applications reduces system failures and associated downtime.
- Simplified Maintenance: Extended service intervals and easy access to internal components minimize maintenance time and costs.
- Regulatory Compliance: Designed to meet relevant marine standards and classification society requirements.
- Documented Quality: Each valve includes a Mill Test Report with complete material traceability and test results.
- Warranty Protection: Comprehensive warranty coverage provides peace of mind and protects your investment.
Our manufacturing facility operates under ISO9001 quality management systems, ensuring consistent product quality and traceability. With shipment capabilities through major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, we efficiently serve customers across our extensive market network spanning North America, South America, Europe, Asia, Africa, and Oceania. The combination of our established manufacturing expertise since 2016, documented quality through Mill Test Reports, and comprehensive warranty support makes this Marine Double Eccentric Butterfly Valve a reliable choice for shipbuilding projects, offshore platforms, and port facilities worldwide. Contact us to discuss how this valve can meet your specific marine application requirements with the quality assurance and performance reliability that has made us a trusted supplier to global markets.
Frequently Asked Questions
Q1: What makes double eccentric design better for marine applications than single eccentric or concentric designs?
A: The double eccentric (double offset) design provides two distinct advantages: first, the shaft is offset from both the pipe centerline and the seat centerline, which allows the disc to completely disengage from the seat during rotation, dramatically reducing wear. Second, this design creates a cam action that requires significantly lower operating torque, which is particularly important in marine systems where actuators may need to operate valves remotely or under challenging conditions.
Q2: What specific corrosion protection measures are taken for seawater service?
A: We offer multiple corrosion protection strategies tailored to seawater exposure: epoxy coatings with minimum 250μm thickness, hot-dip galvanizing, or specialized marine-grade coatings. For more aggressive environments, we recommend stainless steel bodies (316 or 316L) with appropriate cathodic protection compatibility. The specific protection method can be selected based on your water chemistry, temperature, and service conditions.
Q3: Can these valves be used for both seawater and freshwater applications on vessels?
A: Yes, these valves are designed to handle both seawater and freshwater systems commonly found on ships, including ballast systems, cooling water, fire mains, bilge systems, and tank services. Material selections can be optimized based on the specific fluid being handled to ensure maximum service life and performance.
Q4: What information is included in the Mill Test Report?
A: Each valve's Mill Test Report provides complete material traceability including chemical composition and mechanical properties of all major components, results of pressure tests (shell test and seat test), dimensional inspection data, coating thickness measurements, and heat treatment records where applicable. This documentation is essential for regulatory compliance and quality assurance in marine projects.
Q5: What types of actuators are compatible with these valves?
A: The valves are designed to accommodate various actuation methods: manual operation via lever or gearbox, electric actuators (on/off or modulating control), pneumatic actuators (double-acting or spring-return), and hydraulic actuators. We can supply complete packages with actuators pre-mounted and tested, or provide valves alone for integration with your preferred actuator brand.
Q6: What is covered under the warranty, and for how long?
A: Our standard warranty covers defects in materials and workmanship for a specified period from shipment, typically 12-18 months depending on application. The warranty includes repair or replacement of defective components and applies when the valve is used within its specified operating parameters. Extended warranty options may be available for certain applications.
Q7: Are these valves suitable for high-cycle applications like frequent tank filling/emptying?
A: Yes, the double eccentric design is particularly well-suited for high-cycle applications because the reduced friction and wear characteristics extend service life significantly compared to conventional designs. For extremely high-cycle applications, we can recommend specific material combinations and provide cycle life testing data.
Q8: Do you offer emergency delivery for shipyard projects with tight schedules?
A: We maintain inventory of common sizes and configurations to support urgent requirements. With manufacturing facilities in Shanghai and multiple shipping ports available, we can often expedite production and shipment for critical marine projects. Contact us with your specific requirements and timeline for available options.
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