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Help CenterDN400 Lug Butterfly Valve for Marine Applications, Gear Operated With PN16 Rating
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As a leading manufacturer with a strong foundation since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance industrial valves for global markets. Our DN400 Lug Butterfly Valve is engineered specifically for the demanding conditions of marine applications, offering reliable flow control for seawater cooling, ballast, firefighting, and other critical shipboard systems. With an annual export value demonstrating our international reach and commitment to quality backed by ISO9001 certification, we deliver valves that ensure operational safety, durability, and efficiency for shipbuilders and marine engineers worldwide.
This gear-operated lug butterfly valve is designed to meet the rigorous standards of the maritime industry. Its robust construction and precise engineering make it an ideal choice for isolating or regulating fluid flow in pipelines aboard vessels and offshore platforms.
- Superior Marine-Grade Construction: The valve body is typically crafted from durable materials like ductile iron with corrosion-resistant coatings (e.g., epoxy) to withstand harsh saline environments, UV exposure, and fluctuating temperatures. The disc is often made from stainless steel for excellent corrosion resistance and strength.
- Lug-Type Design for Easy Installation & Maintenance: The lug-style body features threaded inserts, allowing the valve to be installed between two flanges without needing long through-bolts. This design facilitates easy removal for inspection or maintenance without disturbing the entire pipeline, a critical advantage in space-constrained engine rooms.
- Efficient Gear Operation for High Torque Applications: The manual gear operator provides significant mechanical advantage, enabling smooth and effortless opening/closing of the large DN400 valve even under high differential pressure. It reduces operator fatigue and ensures reliable shut-off, which is essential for safety-critical systems.
- PN16 Pressure Rating for Robust Performance: Rated for PN16 (16 bar), this valve is suitable for a wide range of working pressures commonly found in marine piping systems, ensuring leak-tight performance and system integrity.
- Versatile Seat Options for Various Media: The valve seat is available in different elastomers like EPDM (for fresh and seawater, good temperature range) or NBR (for oils and fuels). PTFE seats are an option for more aggressive chemicals or higher temperatures, providing flexibility for different shipboard fluids.
Beyond its core features, this valve offers significant benefits for your operations:
- Enhanced System Safety: Reliable bubble-tight shut-off prevents backflow and contamination between systems, crucial for ballast and bilge management.
- Reduced Lifetime Costs: The durable materials and gear operator minimize wear, leading to lower maintenance frequency, fewer replacements, and reduced total cost of ownership.
- Operational Flexibility: The lug design and gear operation allow for safe isolation of specific sections of piping for repair, enhancing overall system uptime and operational flexibility.
Key technical specifications for the DN400 Lug Butterfly Valve are summarized below:
| Parameter | Specification |
| Valve Type | Lug Style Butterfly Valve |
| Nominal Diameter (DN) | 400 mm |
| Pressure Rating (PN) | 16 |
| Connection Type | Lug, for flange mounting per ISO 5211 |
| Operation Type | Manual Gear Operator |
| Body Material (Typical) | Ductile Iron (GGG40/50) with Epoxy Coating |
| Disc Material (Typical) | Stainless Steel (CF8/CF8M) or Ductile Iron Coated |
| Seat Material Options | EPDM, NBR, PTFE, or others upon request |
| Stem Material | Stainless Steel (AISI 420/304/316) |
| Temperature Range | Depends on seat material (e.g., -10°C to 120°C for EPDM) |
| Applicable Standards | ISO 10631, API 609, EN 593 |
Shanghai Zhibang Valve leverages nearly a decade of manufacturing expertise and a proven global supply chain, with products shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing to key markets across North and South America, Europe, Asia, Africa, and Oceania. Our ISO9001-certified quality management system ensures every valve, including this DN400 marine butterfly valve, meets stringent performance and reliability standards. Trust in our experience and commitment to deliver valves that enhance the safety and efficiency of your marine applications. Contact us today to discuss your specific requirements, request a detailed quotation, or learn more about our comprehensive valve solutions for the shipping industry.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a lug-type design over a wafer-type butterfly valve for marine use?
A: The lug-type design features threaded lugs on the valve body. This allows the valve to be bolted directly between two flanges, creating a dead-end service capability. It can be removed for maintenance without dismantling the entire pipeline section, which is highly beneficial in complex and compact marine piping systems.
Q2: Why is a gear operator preferred for a DN400 valve instead of a simple lever?
A: A DN400 valve has a large disc, requiring significant torque to operate, especially under system pressure. A gear operator provides a high mechanical advantage, making it much easier and safer for personnel to open or close the valve completely, ensuring a proper seal and reducing the risk of operator injury.
Q3: Can this valve handle seawater effectively?
A: Yes, when configured with appropriate materials. We typically recommend a corrosion-resistant body coating (like epoxy) and a stainless steel disc. For the seat, EPDM is a common and suitable elastomer for seawater service, offering good resistance and a wide temperature range.
Q4: Is the PN16 rating sufficient for most marine piping systems?
A> PN16 (16 bar) is a standard and commonly specified pressure rating for many shipboard systems, including cooling water, ballast, general service, and fire mains. It is suitable for a wide range of applications. For higher-pressure duties, other ratings can be discussed.
Q5: What certifications does this valve carry?
A> Our manufacturing process is certified under ISO9001, ensuring consistent quality control. The valve itself is designed and manufactured to meet international standards such as ISO 10631, API 609, and EN 593. Specific product certifications (like CE, ABS, DNV) can be provided as optional or upon request, depending on project requirements.
Q6: What is the typical lead time for an order of these valves?
A> Lead times vary based on order quantity and specific material configurations. As a manufacturer with established production lines, we can provide competitive lead times. Please contact our sales team with your required quantity and specifications for an accurate delivery schedule.
Q7: Do you offer different end connection standards besides ISO flanges?
A> Yes. While ISO/EN flanges are standard for marine applications, we can accommodate other flange standards (such as ANSI/ASME) or face-to-face dimensions upon request to ensure compatibility with your existing piping.
Q8: Can the valve be equipped with an actuator for remote operation?
A> Absolutely. The gear operator is designed to be compatible with various pneumatic, electric, or hydraulic actuators. We can supply the valve as a manual unit or as a complete actuated package tailored to your automation needs.
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