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Help CenterCast Iron Lug Butterfly Valve DN400, Marine Grade, Manual Gearbox Operation
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As a professional manufacturer with a strong commitment to quality and reliability, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Cast Iron Lug Butterfly Valve DN400, engineered specifically for demanding marine and industrial applications. Established in 2016, we have built a solid reputation by exporting high-performance valves to global markets, supported by our ISO9001 certified quality management system. This valve is designed to offer robust performance, ease of operation, and long-term durability in critical fluid control systems. We understand the challenges of marine environments, and this product is a testament to our dedication to providing solutions that meet stringent operational requirements.
This Marine Grade butterfly valve is constructed with a durable cast iron body, providing excellent strength and corrosion resistance. The lug-style design allows for easy installation and removal from the pipeline without disturbing adjacent components, making it ideal for system maintenance. The valve features a manual gearbox operation, which provides significant mechanical advantage, allowing for smooth and effortless opening and closing even under high differential pressures. The gear operator ensures precise flow control and reliable shut-off, reducing operator fatigue and enhancing safety.
Key Features and Technical Advantages:
- Superior Corrosion Resistance: The marine-grade specifications include enhanced surface treatments and material selections to withstand harsh saline environments, splash zones, and other corrosive conditions commonly found in offshore and shipboard applications.
- Robust Manual Gearbox: The integrated gear operator multiplies torque, enabling secure seating and unseating of the disc. It often includes a visual position indicator and a lockable handle for safety and security.
- Reliable Sealing Performance: Equipped with a resilient seat (options like EPDM or NBR are available) that ensures bubble-tight shut-off and long service life with minimal maintenance.
- Versatile Application: Suitable for a wide range of media including seawater, fresh water, air, and oils in cooling systems, ballast systems, firefighting lines, and general industrial service.
- Durable Disc Design: The disc is strategically designed for low torque operation and high flow efficiency, minimizing pressure drop across the valve.
Detailed Technical Specifications:
| Parameter | Specification |
| Valve Type | Lug Type Butterfly Valve |
| Nominal Diameter (DN) | 400 |
| Body Material | Cast Iron (GG25/GGG40) |
| Disc Material | Ductile Iron / Stainless Steel (Optional) |
| Seat Material | EPDM, NBR, or other elastomers (Optional) |
| Stem Material | Stainless Steel (e.g., SS420, SS304) |
| Operation | Manual Gearbox (Ratio customizable) |
| Pressure Rating | PN10, PN16 (or equivalent ANSI Class 125/150) |
| Temperature Range | Depends on seat material (e.g., -10°C to 120°C for EPDM) |
| End Connection | Lug, drilled to standard flange patterns (e.g., ISO, ANSI) |
| Gearbox Mounting | ISO 5211 standard pad |
| Surface Treatment | Marine-grade epoxy coating or other anti-corrosion treatment |
Benefits for Your Operations:
- Reduced Maintenance Costs: The robust construction and corrosion-resistant features lead to a longer service interval and lower lifetime costs.
- Enhanced System Safety: The reliable shut-off capability and secure gear operation prevent leaks and ensure process safety.
- Installation Flexibility: The lug design offers installation versatility, serving as a dead-end service valve or as a regular isolation valve.
- Global Compliance: Designed to meet common international standards for dimensions and performance, facilitating use in projects worldwide.
Backed by Shanghai Zhibang Valve's experience in serving diverse markets across North America, South America, Europe, Asia, Africa, and Oceania, this valve represents a reliable choice for engineers and procurement specialists. Our annual export value reflects the trust placed in our products by international clients. We ensure consistent quality through our ISO9001 processes and offer flexible shipment options from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing. Choosing our DN400 Marine Grade Butterfly Valve means investing in a component that delivers performance, durability, and value. Contact us today to discuss your specific requirements, request a detailed quotation, or learn more about our full valve portfolio.
Frequently Asked Questions (FAQ):
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Q: What does "Marine Grade" specifically mean for this butterfly valve?
A: "Marine Grade" indicates that the valve is designed with enhanced corrosion protection to withstand harsh marine environments. This typically involves special surface coatings (like epoxy), material selections resistant to saltwater, and sometimes specific design features to prevent galvanic corrosion, making it suitable for offshore platforms, ships, and coastal facilities. -
Q: Can this lug valve be used as an end-of-line valve?
A: Yes, absolutely. The lug design features threaded inserts or through-holes on both sides of the valve body. This allows the valve to be bolted between two flanges without nuts on the downstream side, making it perfect for dead-end service where the valve needs to hold pressure from one direction only. -
Q: What is the advantage of a manual gearbox over a simple lever operator for a DN400 valve?
A: A manual gearbox provides a significant mechanical advantage (gear reduction), making it much easier to operate a large-diameter valve, especially under high pressure. It allows for finer control during throttling, reduces required hand force, and often includes a position indicator. For a DN400 valve, a gear operator is highly recommended for safe and efficient operation. -
Q: Are the seat and disc materials customizable?
A: Yes. We offer various elastomer options for the seat (such as EPDM for water, NBR for oils) and different disc materials (like ductile iron with coating or stainless steel) to match your specific media, temperature, and pressure conditions. Please specify your requirements when inquiring. -
Q: What pressure standards does this valve conform to?
A: This valve is typically rated for PN10 and PN16 pressure ratings, which are common European standards. Equivalent ratings like ANSI Class 125 or 150 are also available. The specific pressure rating will be confirmed based on your order specifications and the selected materials. -
Q: Is the gearbox compliant with any actuator mounting standard?
A: The gearbox is equipped with an ISO 5211 standard mounting pad. This allows for future automation if needed. You can easily mount an electric, pneumatic, or hydraulic actuator onto the same gearbox without modifying the valve, offering great flexibility for system upgrades. -
Q: What is the typical lead time for this product?
A: Lead time varies based on order quantity and specific customization. For standard configurations, we generally maintain stock or offer competitive production schedules. We provide accurate lead time estimates with every quotation to help you plan your project timeline effectively. -
Q: Do you provide documentation and certifications with the valve?
A: Yes. Along with the product, we can provide essential documentation such as a material test report, certificate of conformity, and operation manual. Our manufacturing facility is ISO9001 certified, ensuring consistent quality control processes.
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