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Help CenterDN50-DN600 Marine Wafer Duo-Eccentric Butterfly Valve, No Actuator
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As a specialized manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our DN50-DN600 Marine Wafer Duo-Eccentric Butterfly Valve. Engineered for demanding marine and offshore applications, this valve combines robust construction with the precise, leak-resistant performance of a double eccentric design. With an annual export value exceeding US$1 million and certifications like ISO9001 ensuring consistent quality, we supply reliable fluid control solutions to global markets, including North America, Southeast Asia, and Europe. Our valve is designed to offer superior sealing, reduced maintenance, and easy installation, making it a trusted component for shipbuilding, water treatment, and industrial piping systems.
The core of this valve is its duo-eccentric (double eccentric) design. This means the disc axis is offset from both the seat axis and the valve centerline. This ingenious geometry minimizes wear and friction during operation, ensuring a longer service life for the sealing components. When closed, the disc cams into the seat, creating a tight seal without excessive force. Key advantages include:
- Excellent Sealing Performance: The offset design allows for a progressive, compressive seal, significantly reducing the risk of leakage, even under variable pressure conditions.
- Low Operating Torque: Reduced friction between the disc and seat means the valve requires less force to open or close, which is crucial for manual operation and extends the life of the gearbox if used.
- Extended Seat Life: By minimizing abrasive contact, the resilient seat (typically PTFE or EPDM) lasts much longer compared to concentric butterfly valves.
- Compact and Lightweight: The wafer design eliminates the need for flange bolts, making the valve lighter and easier to install between two flanges, saving space and labor.
This valve is built to handle the harsh environments of marine applications. The body is typically constructed from durable carbon steel or cast iron, while the disc is made from corrosion-resistant stainless steel. The choice of seat material—PTFE for wide chemical resistance or EPDM for excellent water and steam service—can be tailored to your specific media. The valve is manually operated via a lever or a gearbox, providing reliable control without the complexity of an actuator. Below is a summary of typical specifications:
| Parameter | Details / Range |
|---|---|
| Nominal Diameter (DN) | DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Pressure Rating (PN) | PN10, PN16 (customizable upon request) |
| Body Material | Carbon Steel WCB, Cast Iron |
| Disc Material | Stainless Steel 304/316 |
| Seat Material | PTFE, EPDM (options available) |
| Operation | Manual Lever, Manual Gearbox (no actuator included) |
| Connection | Wafer Type (installed between flanges) |
| Design | Double Eccentric (Duo-Eccentric) |
For clients, the benefits are tangible: reduced downtime due to longer component life, lower installation costs from the wafer design, and improved system reliability in critical marine piping. It is suitable for seawater cooling lines, ballast systems, firefighting systems, and general service water lines on vessels and offshore platforms.
Shanghai Zhibang's commitment to quality is backed by our ISO9001 certified manufacturing processes, ensuring every valve meets stringent standards. Our products reach clients across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, and more, facilitated by efficient shipment from ports like Shanghai, Guangzhou, and Hong Kong. With years of expertise and a focus on the marine sector, we deliver valves that perform reliably in challenging conditions. Choose our DN50-DN600 Marine Wafer Duo-Eccentric Butterfly Valve for a balance of durability, performance, and value. Contact us today to discuss your specifications or request a quotation.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a "duo-eccentric" design over a standard butterfly valve?
A: The double eccentric design offsets the disc axis twice, which drastically reduces friction and wear between the disc and seat during operation. This leads to a tighter seal, lower operating torque, and a significantly extended lifespan for the sealing seat, especially important for frequent cycling or abrasive media.
Q2: Can this valve be used with seawater or other corrosive fluids?
A: Yes, it is designed for marine applications. The disc is typically made from stainless steel (304 or 316), which offers good corrosion resistance. The seat material (like PTFE) also resists many chemicals. For specific corrosive media, we can advise on the optimal material combination.
Q3: Does "Wafer" type mean I don't need flange bolts?
A: Correct. A wafer butterfly valve is designed to be installed between two pipeline flanges. The flanges' bolts clamp the valve in place. This makes installation quicker, reduces weight, and saves space compared to lug or flanged-end valves.
Q4: The title says "No Actuator." Can an actuator be added later?
A: Absolutely. This valve is supplied with a manual operator (lever or gearbox). The stem design is standardized, allowing you to easily mount an electric, pneumatic, or hydraulic actuator later if automated control is required. We can provide compatible actuators upon request.
Q5: What pressure ratings are available?
A: Standard pressure ratings are PN10 and PN16. These are suitable for many marine and industrial water systems. For higher pressure requirements, please consult us as customized designs with different materials or reinforcements may be available.
Q6: How do I choose between PTFE and EPDM seat material?
A: PTFE (Teflon) offers excellent chemical resistance and a wide temperature range. EPDM is particularly good for water, steam, and some mild chemicals, and often provides a tighter seal at lower temperatures. We can recommend based on your fluid type, temperature, and pressure.
Q7: What is the typical delivery time for these valves?
A: For standard sizes and materials, we often have stock or short production lead times. Delivery depends on order quantity and specifications. Our shipments are efficiently handled from major ports like Shanghai, Guangzhou, or Hong Kong, facilitating timely delivery to global markets.
Q8: Does your company provide after-sales support or warranty?
A: Yes, as a manufacturer with ISO9001 certification, we ensure product quality and provide technical support. Specific warranty terms are provided with the order. We are committed to resolving any issues and providing guidance for installation and maintenance.
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