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Help CenterMarine Wafer Duo-Eccentric Butterfly Valve, No Actuator, With Mill Test Report
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As a leading manufacturer with a strong commitment to quality since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance fluid control solutions for demanding global markets. Our Marine Wafer Duo-Eccentric Butterfly Valve is engineered to meet the rigorous requirements of marine and offshore applications, offering superior sealing performance, durability, and reliability in critical service conditions. This valve is designed without an actuator as standard, providing a robust and cost-effective base unit that can be easily automated if required, giving you maximum flexibility for your specific system integration needs.
The duo-eccentric, or double offset, design is the cornerstone of this valve's advanced performance. Unlike concentric butterfly valves, the disc axis is offset from both the seat centerline and the valve body centerline. This ingenious geometry delivers significant advantages:
- Reduced Torque & Extended Seat Life: The offset design ensures the disc cam-action lifts away from the seat immediately upon opening, minimizing friction and wear. This results in lower operating torque and a dramatically longer service life for the sealing components.
- Bubble-Tight Shut-off: The eccentric rotation creates a tight mechanical seal against the seat, achieving reliable shut-off even in applications with moderate pressure differentials, suitable for a wide range of liquids and gases.
- Bi-Directional Sealing: The valve provides effective sealing in both flow directions, enhancing its versatility and installation flexibility within complex piping systems.
Every valve is subjected to rigorous quality control and testing before dispatch. The inclusion of a comprehensive Mill Test Report (MTR) with each unit provides full traceability and verification of material chemical composition and mechanical properties, giving you complete confidence in the product's integrity and compliance with specified standards.
Detailed Technical Specifications & Configuration Options:
| Parameter | Specification / Options |
|---|---|
| Valve Type | Wafer, Duo-Eccentric (Double Offset) Butterfly Valve |
| Body & Disc Materials | Carbon Steel (WCB), Stainless Steel (CF8/CF8M), Duplex Steel; Other materials available upon request. |
| Seat Materials | Standard: PTFE (Teflon), EPDM, NBR. Optional: Metal Seat (Stainless Steel) for high-temperature or abrasive services. |
| Size Range (Nominal Diameter) | DN50 to DN1200 (2 inches to 48 inches) |
| Pressure Ratings | PN10, PN16, PN25; ANSI Class 150 |
| End Connection | Wafer style, conforming to relevant flange standards (DIN, ANSI, JIS, etc.) |
| Standard Operation | Manual operation via lever or gearbox. Note: This specific listing is for the valve body without an actuator. |
| Actuator Compatibility | Designed for easy integration with pneumatic, electric, or hydraulic actuators. Mounting kits and actuators are available as optional accessories. |
| Design Standards | Manufactured in accordance with API 609, ISO 5752, and other relevant international standards. |
| Temperature Range | Dependent on seat material: PTFE up to 200°C, EPDM up to 120°C, Metal Seat for higher temperatures. |
| Applications | Seawater cooling systems, ballast systems, firefighting lines, fuel oil transfer, bilge systems, offshore platforms, and general industrial services. |
Key Benefits for Your Project:
- Enhanced Reliability for Marine Use: Constructed with corrosion-resistant materials and designed to withstand the harsh marine environment, including exposure to saltwater.
- Low Maintenance & Long Lifecycle: The duo-eccentric mechanism minimizes wear, leading to reduced downtime and lower total cost of ownership.
- Documented Quality Assurance: The provided Mill Test Report ensures material traceability and verifies compliance, which is often a critical requirement for shipyards and offshore projects.
- Flexible Configuration: Offered without an actuator, it allows you to select and source the actuation solution that best fits your control system, budget, and power source availability.
- Compact & Lightweight Design: The wafer design provides a space-saving and weight-efficient solution compared to gate or globe valves, which is a crucial advantage in marine vessel construction.
FAQ – Frequently Asked Questions
-
Q: What does "No Actuator" mean in this listing?
A: It means the valve is supplied as a manual valve body only, typically with a lever or gear operator. It does not include a pneumatic, electric, or hydraulic actuator. This allows you the freedom to pair it with an actuator of your choice or use it in manual applications. -
Q: Can I order this valve with an actuator pre-mounted?
A: Yes. While this specific SKU is for the valve body, we offer a full range of compatible actuators and can supply the valve as a complete automated package. Please contact our sales team for a customized quotation. -
Q: Why is the duo-eccentric design preferred for marine applications?
A: Its superior sealing capability and reduced seat wear make it highly reliable for critical shipboard systems like cooling, ballast, and firefighting, where failure is not an option. It handles the pressure variations and corrosive media common in these applications effectively. -
Q: What is included in the Mill Test Report (MTR)?
A: The MTR is a certified document from the material mill. It details the heat/charge number, chemical analysis, mechanical properties (tensile strength, yield strength, etc.), and results of any non-destructive tests performed on the raw materials used for the valve body and disc. -
Q: What flange standards are available?
A: We can manufacture valves to match most common international flange standards, including ANSI, DIN, JIS, BS, and GOST. Please specify your required standard and pressure class when inquiring. -
Q: Is this valve suitable for potable water or food-grade applications?
A: With appropriate material selections, such as stainless steel body/disc and FDA-approved elastomer seats (like EPDM), the valve can be configured for such services. Please discuss your specific media and certification requirements with us. -
Q: What is the lead time for an order?
A: Lead times vary based on size, material, and quantity. Standard configurations typically have shorter lead times. We provide reliable production scheduling and keep you informed throughout the manufacturing process. -
Q: Do you offer any warranty?
A: Yes, our valves come with a standard warranty against defects in material and workmanship. The specific warranty period and terms are provided with the commercial proforma invoice.
Backed by our ISO9001 certified manufacturing processes and an annual export value reflecting consistent global trust, Shanghai Zhibang Valve has established itself as a reliable partner for industrial and marine valve solutions. Our products are shipped worldwide from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics to our customers across North America, Europe, Asia, Africa, and Oceania. Choosing our Marine Wafer Duo-Eccentric Butterfly Valve means investing in a component built for performance, supported by documented quality, and designed to deliver long-term value in your most challenging applications. Contact us today to discuss your project specifications or to request a detailed quotation.
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