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Help CenterCast Steel Marine Double Eccentric Butterfly Valve DN50-DN1200 PN10
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As a leading manufacturer with over 8 years of specialized experience, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Cast Steel Marine Double Eccentric Butterfly Valve. Engineered for the demanding environments of marine and offshore applications, this valve series from DN50 to DN1200 is designed to deliver exceptional reliability, superior sealing, and long service life in critical flow control systems. Our commitment to quality, backed by ISO9001 certification, ensures that every valve meets the rigorous standards required for global maritime operations, providing our clients with a dependable solution for seawater cooling, ballast, firefighting, and fuel oil systems.
The core of this valve's performance lies in its double eccentric (double-offset) design. Unlike concentric butterfly valves, the shaft is positioned behind the disc centerline and offset from the seat center, creating a cam action during operation. This ingenious mechanism ensures that the disc only contacts the seat in the final few degrees of closure, virtually eliminating wear during operation and providing a tight, bubble-tight seal. This design is particularly advantageous for handling abrasive media like seawater and slurries, common in marine settings. The use of high-grade cast steel (typically A216 WCB) for the body provides excellent strength and corrosion resistance, essential for withstanding the harsh, saline atmosphere.
Key Technical Features & Advantages:
- Robust Construction: The cast steel body and disc offer high mechanical strength and durability against water hammer and pipeline stresses.
- Superior Sealing Performance: The metal-to-metal seat (often Stellite or 316SS overlay) ensures reliable shut-off even under high temperatures and pressures, with a service life far exceeding that of soft-seated valves in abrasive services.
- Low Operating Torque: The eccentric design drastically reduces friction, allowing for easier operation with smaller actuators, which translates to lower overall system costs and energy consumption.
- Bidirectional Sealing: Capable of providing effective sealing against flow from either direction, enhancing system design flexibility.
- Minimal Maintenance: The wear-minimizing design and robust construction lead to significantly reduced maintenance intervals and downtime.
- Versatile Actuation: Available with manual lever, gearbox, electric, or pneumatic actuators to suit any level of automation required.
The following table outlines the primary specifications for this valve series:
| Parameter | Specification |
|---|---|
| Design Standard | API 609, EN 593, ISO 10631 |
| Face-to-Face Dimension | Per API 609 / EN 593 |
| Pressure-Temperature Rating | PN10 (10 bar) at corresponding temperature limits |
| Test Standards | Shell Test: Per API 598 / EN 12266-1 Seat Test: Per API 598 / EN 12266-1 |
| Disc Material | Cast Steel WCB with CF8/CF8M (SS304/SS316) optional |
| Stem Material | Stainless Steel (17-4PH or 416/420 equivalent) |
| Seat Material | Stainless Steel with Stellite overlay or equivalent hard-facing |
For shipbuilders, offshore platform operators, and port facility managers, the benefits are clear. This valve offers a cost-effective and reliable alternative to more expensive gate or globe valves for on/off and throttling services. Its compact design saves valuable space and weight on vessels, a critical factor in marine engineering. The long service life and low maintenance requirements directly contribute to lower total cost of ownership (TCO) and increased operational uptime. Furthermore, its compatibility with various international standards ensures seamless integration into both new builds and retrofit projects worldwide.
Trust is built on a foundation of proven performance and global reach. Since our establishment in 2016, Shanghai Zhibang Valve has consistently delivered quality products, with an annual export value ranging between US$1 Million and US$1.5 Million, serving diverse and demanding markets across North and South America, Europe, Asia, Africa, and Oceania. Our valves are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. Choosing our Cast Steel Marine Double Eccentric Butterfly Valve means partnering with a certified manufacturer dedicated to providing durable, high-performance flow control solutions that stand the test of time and tide. Contact us today to discuss your specific requirements and experience the Zhibang advantage.
Frequently Asked Questions (FAQ):
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Q: What is the main advantage of a double eccentric design over a standard butterfly valve?
A: The double offset design minimizes friction and wear by ensuring the disc only contacts the seat at the point of final closure. This results in lower operating torque, a longer service life, and a more reliable seal, especially for abrasive media and high-cycle applications. -
Q: Is this valve suitable for seawater applications?
A: Absolutely. The combination of a cast steel body (with optional coatings), stainless steel stem, and hardened metal seat materials provides excellent corrosion resistance against seawater, making it ideal for ballast, cooling, and firefighting systems on ships and offshore platforms. -
Q: Can this valve be used for throttling or flow control?
A: Yes, the double eccentric design offers improved flow characteristics and better control compared to concentric valves. However, for precise throttling, it is recommended to consult with our engineers to select the appropriate disc profile and actuator. -
Q: What types of actuators are compatible?
A: The valve is designed to be compatible with a wide range of actuators. We can supply it as a manual valve (lever or gear operated) or pre-fitted with electric, pneumatic, or hydraulic actuators based on your system's automation requirements. -
Q: What is the typical delivery time for an order?
A: Delivery time varies based on the size, quantity, and actuator specification. Standard sizes often have shorter lead times. Please contact our sales team with your specific needs for an accurate delivery schedule. -
Q: Do you provide custom modifications or special materials?
A> Yes. While we offer a standard range, modifications such as special trim materials (like duplex stainless steel), extended stems, different face-to-face dimensions, or specific painting/coating requirements can be accommodated. Please inquire for customization options. -
Q: What documentation is provided with the valves?
A: Each valve shipment is typically accompanied by essential documentation, which may include a material test certificate (MTC), certificate of conformity, pressure test reports, and detailed installation & maintenance manuals.
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