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Help CenterMarine Wafer Duo-Eccentric Butterfly Valve, GB/T3037 Standard, No Actuator
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As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance fluid control solutions for demanding industrial and marine applications. Our Marine Wafer Duo-Eccentric Butterfly Valve, engineered to the GB/T3037 standard, is a testament to our commitment to quality, reliability, and durability. This valve is specifically designed to meet the rigorous challenges of marine environments, offering superior sealing performance and long service life. We understand the critical nature of valve performance on board vessels, and our product is built to ensure safe and efficient operation of piping systems. With an annual export value reflecting our global reach, we are a trusted partner for clients across North America, South America, Europe, Asia, Africa, and Oceania.
This valve is engineered with a duo-eccentric (double-offset) design, which significantly reduces wear on the seat and disc by minimizing friction during operation. The design principles ensure a tight, bubble-tight seal even after numerous cycles, making it ideal for isolation and regulation services in seawater, ballast, cooling, and other shipboard systems. The wafer-style body allows for easy installation between flanges, saving space and weight—a crucial factor in marine design.
Key Features and Technical Advantages:
- Duo-Eccentric Design: The double-offset stem placement ensures the disc lifts away from the seat immediately upon opening, eliminating sliding contact and drastically reducing seat wear and torque requirements.
- Robust Construction: Available in a range of body materials like ductile iron and cast steel, with options for stainless steel for corrosive services. The disc is typically made from corrosion-resistant stainless steel.
- High-Performance Sealing: Utilizes resilient seat materials such as PTFE or EPDM, which provide excellent chemical resistance and reliable sealing across a wide temperature range.
- Compliance with GB/T3037: Manufactured in strict accordance with Chinese national standards for butterfly valves, ensuring dimensional interchangeability, pressure integrity, and performance reliability.
- Manual Operation (Standard): Supplied without an actuator for manual operation via a lever, gearbox, or handwheel, offering simplicity and direct control. Actuator mounting pads are standard for future automation if required.
- Space and Weight Efficient: The wafer design provides a compact profile, reducing the overall weight and space required in the piping system compared to lug or flanged valves.
Technical Specifications Table:
| Parameter | Specification |
| Design Standard | GB/T3037 |
| Connection Type | Wafer |
| Body Material | Ductile Iron (GGG40), Cast Steel (WCB), Stainless Steel (CF8/CF8M) |
| Disc Material | Stainless Steel (SS304, SS316), Ductile Iron with Ni-plating |
| Seat Material | PTFE, EPDM, NBR (Optional) |
| Stem Material | Stainless Steel (17-4PH, SS416) |
| Size Range (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1200 |
| Pressure Rating (PN) | 10, 16, 25 |
| Temperature Range | -20°C to +150°C (depending on seat material) |
| Leakage Class | Class A (Bubble-tight) per relevant standards |
| Operation | Manual (Lever/Gear). Actuator mounting pad standard. |
Benefits for Your Project: By choosing our Marine Wafer Duo-Eccentric Butterfly Valve, you gain a component that enhances system reliability, reduces maintenance downtime due to its wear-resistant design, and ensures compliance with marine specifications. Its compact form factor contributes to optimized ship design and lower lifecycle costs. The valve's adaptability allows it to handle various media, from fresh and seawater to mild chemicals, making it a versatile choice for multiple shipboard applications.
Backed by our ISO9001 quality management system and nearly a decade of manufacturing expertise since our establishment in 2016, Shanghai Zhibang Valve guarantees product consistency and performance. Our significant annual export volume to diverse markets including North America, Europe, and Southeast Asia is a strong testament to the global acceptance and reliability of our valves. We support seamless logistics with major shipment ports like Shanghai, Guangzhou, and Hong Kong. For your next marine or industrial project requiring dependable, standards-compliant valving, our GB/T3037 Marine Wafer Duo-Eccentric Butterfly Valve presents a technically sound and commercially wise solution. Contact us today to discuss your specifications or request a detailed quotation.
Frequently Asked Questions (FAQ):
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Q: What is the main advantage of the duo-eccentric design in this butterfly valve?
A: The duo-eccentric (double-offset) design ensures that the disc cam-lifts away from the seat upon the first few degrees of opening. This action eliminates constant rubbing friction, which greatly reduces seat wear, lowers operating torque, and extends the valve's service life, ensuring reliable sealing over many cycles. -
Q: Can this valve be used for throttling control in marine systems?
A: While primarily designed for reliable on/off isolation, the duo-eccentric design offers improved flow characteristics compared to concentric valves. It can be used for moderate throttling applications. For precise flow control, we recommend consulting our engineering team to select the appropriate trim and actuator package. -
Q: The product title states 'No Actuator'. Can an actuator be fitted later?
A: Absolutely. The valve is supplied as a manual unit for cost-effectiveness and flexibility. It comes with a standardized actuator mounting pad (ISO 5211 or similar), allowing for easy retrofitting of pneumatic, electric, or hydraulic actuators in the field whenever automation is required. -
Q: How does compliance with GB/T3037 benefit international buyers?
A: GB/T3037 is a well-recognized Chinese national standard that specifies dimensions, materials, pressure ratings, and testing methods. Compliance ensures the valve is manufactured to consistent, high-quality benchmarks. The dimensions are often compatible with international flange standards (like ANSI, DIN, JIS), facilitating integration into global projects. -
Q: What are the typical applications for this valve on a ship?
A: This valve is suitable for a wide range of shipboard services, including but not limited to seawater cooling lines, ballast water systems, firefighting lines, bilge and drain systems, fuel oil transfer lines (compatible grades), and general service water lines. -
Q: What seat material is recommended for seawater service?
A: For seawater applications, EPDM (Ethylene Propylene Diene Monomer) is a commonly recommended seat material due to its excellent resistance to saltwater, ozone, and weathering. PTFE seats offer wider chemical resistance and a lower friction coefficient for higher temperature services. -
Q: What is your lead time for standard sizes like DN150 or DN300?
A: For standard configurations in common sizes and materials, we typically maintain stock or can offer competitive lead times. Exact lead times depend on the specific material grade, pressure rating, and current order volume. Please inquire with your required specifications for an accurate delivery schedule. -
Q: Do you provide technical support and documentation like test reports?
A: Yes, as a professional manufacturer, we provide comprehensive technical data sheets, material certificates, and can supply factory acceptance test (FAT) reports, including shell test and seat leakage test reports, upon request to support your project documentation and quality assurance processes.
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