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Help CenterMarine Wafer Duo-Eccentric Butterfly Valve, No Actuator, Extended Warranty Available
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As a leading manufacturer with ISO 9001 certified production since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering high-performance, reliable fluid control solutions for demanding global markets. Our Marine Wafer Duo-Eccentric Butterfly Valve is engineered specifically to meet the rigorous challenges of marine and offshore applications, offering superior sealing performance, exceptional durability, and long-term cost-effectiveness. We understand the critical need for dependable valve operation in harsh saltwater environments, and this product is a direct result of our commitment to quality and innovation. With an annual export value reflecting our global reach across North America, South America, Europe, Asia, Africa, and Oceania, we are your trusted partner for marine-grade valve solutions shipped efficiently from major ports like Shanghai, Guangzhou, and Hong Kong.
This valve is designed with a duo-eccentric (double-offset) disc configuration, which significantly reduces wear on the seat by minimizing friction during operation. This key feature translates to a longer service life and more reliable shut-off, even after thousands of cycles. The wafer-style design allows for easy installation between ANSI or DIN standard flanges, saving on space and weight—a crucial advantage in marine vessel design. Offered without an actuator, this valve body provides the flexibility for system integrators to select the most suitable pneumatic, hydraulic, or electric actuation package based on specific project requirements and control philosophies.
Core Technical Features & Advantages:
- Superior Sealing Integrity: The duo-eccentric geometry ensures the disc lifts completely away from the seat before rotating, eliminating sliding contact and seat abrasion. This guarantees a bubble-tight seal and consistent performance over time.
- Corrosion Resistance for Marine Use: Available in a range of materials including coated carbon steel, stainless steel (CF8/CF8M), and duplex steels to combat corrosion from seawater, bilge systems, ballast control, and other marine fluids.
- High Pressure & Temperature Capability: The robust design and metal-seated options allow this valve to handle higher pressure classes (up to Class 300) and a wider temperature range compared to standard concentric butterfly valves.
- Low Operating Torque: The offset shaft design dramatically lowers the torque required to operate the valve, which allows for the use of smaller, more cost-effective actuators and reduces overall system energy requirements.
- Bi-Directional Flow Shut-off: Engineered to provide reliable sealing against flow from either direction, enhancing system safety and flexibility in piping layout.
- Extended Service Intervals: Reduced wear on critical components means less frequent maintenance, lower lifecycle costs, and increased uptime for critical marine systems.
Detailed Specifications & Options:
| Parameter | Specification / Options |
| Design Standard | API 609, MSS SP-67, ISO 5752 |
| Face-to-Face | Per API 609 / ISO 5752 Standard |
| Flange Connection | Wafer type, conforms to ANSI B16.5, DIN, JIS, BS |
| Pressure-Temperature Rating | As per selected material class per ASME B16.34 |
| Stem Design | One-piece or two-piece stem, sealed with multiple O-rings/bushings |
| Leakage Class | Zero Leakage (Soft Seat) per MSS SP-61 / ANSI FCI 70-2 Class VI |
| Test Standards | Shell Test & Seat Test per API 598 / ISO 5208 |
| Optional Features | Locking Device, Position Indicator, Drain/Vent Ports, Special Coatings |
Application Scenarios & Customer Benefits: This valve is ideally suited for a wide array of marine systems where reliability is non-negotiable. Primary applications include seawater cooling lines, firefighting systems, fuel oil transfer, ballast water management, tank venting, and cargo handling systems. For shipyards and marine engineers, the benefits are clear: a robust valve that reduces total cost of ownership through extended warranty availability, minimizes downtime due to its durable construction, and offers design flexibility by being supplied as a body-ready for custom actuation. This simplifies inventory management and allows for standardized valve bodies across a fleet with different automation needs.
Choosing Shanghai Zhibang means partnering with a dedicated manufacturer whose quality systems are internationally recognized. Our ISO 9001 certification underpins every valve we produce, ensuring consistent quality from raw material inspection to final testing. The optional extended warranty we offer is a testament to our confidence in the durability and performance of this marine-grade duo-eccentric butterfly valve. Supported by our established supply chain from Shanghai and other major ports, we guarantee reliable delivery to keep your projects on schedule. Contact us today to discuss your specific requirements for size, pressure rating, and material selection, and let us provide you with a valve solution that stands up to the toughest conditions at sea.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a 'duo-eccentric' design over a standard butterfly valve?
A1: The duo-eccentric (double-offset) design introduces two axes of offset: one for the shaft and one for the disc seat axis. This geometry allows the disc to cam away from the seat during the first few degrees of opening, eliminating friction and wear. This results in a longer-lasting seal, higher pressure capability, and lower operating torque.
Q2: Why is this valve listed with 'No Actuator'?
A2: We supply the valve body separately to provide maximum flexibility for system integrators and shipbuilders. This allows you to select and source an actuator (pneumatic, electric, hydraulic) that perfectly matches your control system voltage, speed, fail-safe requirements, and local supplier preferences, potentially optimizing cost and lead time.
Q3: What materials are recommended for typical seawater service?
A3: For seawater applications, we commonly recommend a stainless steel body (CF8M/316) with an EPDM or PTFE soft seat. For more corrosive or high-erosion services, duplex stainless steel or nickel-aluminum bronze bodies with specialized metal seats are available upon request.
Q4: Can this valve be used for throttling control in marine systems?
A4: While primarily designed for reliable on/off service, the duo-eccentric design offers improved flow characteristics over concentric valves. It can be used for moderate throttling duties, especially when paired with a high-quality positioner on the actuator. For precise control, please consult our engineering team for specific CV characteristics.
Q5: What does the 'Extended Warranty Available' entail?
A5: Beyond our standard warranty, we offer an optional extended warranty program that covers specific components like the seat and stem seals for a longer period. Terms and conditions vary based on application, media, and cycle frequency. Please inquire for a detailed warranty proposal tailored to your project.
Q6: Are your valves suitable for cryogenic services on LNG carriers?
A6: Standard models are designed for general marine service. For cryogenic applications such as LNG, specially engineered versions with extended stems, low-temperature materials (like CF8M for body), and deep-cold tested seats are required. We can develop such custom solutions based on your detailed specifications.
Q7: What documentation is provided with the valve?
A7> Each valve is supplied with a comprehensive data pack including Material Test Certificates (MTC/CMTR), a detailed dimensional drawing, a pressure test certificate compliant with API 598 or ISO 5208, a manual, and a packing list. Certificates of Origin and other shipping documents are also provided.
Q8: How do I determine the correct size and pressure class for my application?
A8> You will need your pipeline size (NPS/DN), the design pressure and temperature of the system, and the fluid media. Our technical sales team can then assist you in selecting the appropriate valve size, pressure rating (PN/Class), and optimal material combination to ensure safe and reliable operation.
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