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Help CenterLarge Diameter DN400 Marine Lug Butterfly Valve With Ductile Iron Body and EPDM Seal
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As a specialized manufacturer with a strong export footprint, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our high-performance Large Diameter DN400 Marine Lug Butterfly Valve. Engineered for demanding marine and offshore applications, this valve combines the robust strength of a ductile iron body with the superior sealing capabilities of an EPDM liner, ensuring reliable flow control in seawater, ballast, cooling, and fire-fighting systems. Our commitment to ISO9001-certified quality management underpins every stage of production, delivering a product built for durability, ease of operation, and long service life in corrosive environments.
The core value of this valve lies in its optimal balance of strength, corrosion resistance, and maintenance-friendly design. The lug-style body allows for easy installation and removal from a pipeline without disturbing adjacent sections, a critical advantage for shipboard maintenance. Whether you are outfitting a new vessel or upgrading existing maritime infrastructure, this valve is designed to meet the rigorous standards of the industry.
Key Product Features & Technical Advantages:
- Robust Construction: The valve body is crafted from high-grade ductile iron (GGG40/50), offering excellent tensile strength and impact resistance compared to standard gray iron, which is vital for withstanding pressure surges and mechanical stresses in marine service.
- Superior Sealing Performance: The seat utilizes a resilient EPDM (Ethylene Propylene Diene Monomer) seal, renowned for its outstanding resistance to seawater, ozone, weathering, and a wide range of chemicals. It ensures a bubble-tight shut-off and maintains flexibility across a broad temperature range.
- Lug Design for Versatility: The double flange lug pattern permits the valve to be bolted directly between two pipeline flanges. This design isolates the valve, allowing for the disconnection of downstream piping for service without draining the entire line—a highly practical feature for marine systems.
- Corrosion Protection: Standard external coatings include epoxy powder coating, which provides a durable, corrosion-resistant barrier against salt spray and humid marine atmospheres. Special coatings like marine-grade paint are available upon request.
- Multiple Actuation Options: The valve can be fitted with a manual lever lock, a gear operator for high-torque applications, or automated with pneumatic/electric actuators for remote control and integration into ship automation systems.
- Low Torque Operation: The disc design and polished stem ensure smooth, low-friction operation, reducing the effort required for manual actuation and extending the life of automated actuators.
Detailed Technical Specifications:
| Parameter | Specification |
| Nominal Diameter (DN) | 400 mm |
| Body Material | Ductile Iron (GGG40/50) |
| Disc Material | Ductile Iron, Nylon Coated / 316SS (Optional) |
| Stem Material | Stainless Steel (420/304/316) |
| Seat / Liner Material | EPDM (Standard), NBR, Viton Available |
| Pressure Rating | PN10, PN16 (10/16 Bar), Class 150 |
| Temperature Range (with EPDM) | -20°C to +120°C |
| End Connection | Lug Type, Drilled to EN 1092-2 / ASME B16.1 |
| Operation | Manual Lever, Worm Gear, Pneumatic/ Electric Actuator |
| Design & Test Standards | API 609, EN 593, ISO 10631 |
Benefits for Your Marine Project:
- Enhanced System Reliability: The combination of materials ensures minimal leakage and failure, crucial for safety and operational continuity at sea.
- Reduced Lifetime Cost: Durable construction and easy maintenance lower total cost of ownership by minimizing replacement frequency and downtime.
- Flexible Integration: Compatible with various actuation methods, it can be tailored to fit new automated systems or retrofit existing manual setups.
- Global Compliance: Manufactured to widely recognized international standards (API, EN, ISO), facilitating approval for use in shipbuilding yards worldwide.
Frequently Asked Questions (FAQ):
Q1: Is this valve suitable for full seawater immersion service?
A: The standard epoxy-coated ductile iron body and EPDM seat offer excellent resistance to seawater spray and splashing. For prolonged full immersion, specifying additional corrosion protection like marine-grade paint or discussing alternative body materials like nickel-aluminum bronze is recommended.
Q2: What is the main advantage of a lug-type butterfly valve over a wafer type?
A: The lug design allows the valve to be installed as a piping endpoint or isolated for service. Bolts pass through the lugs into both mating flanges, enabling the downstream pipe to be disconnected independently. Wafer valves rely on line pressure and shared bolts, making them less suitable for end-of-line or isolation maintenance scenarios common in marine systems.
Q3: Can you provide valves with pneumatic actuators for remote operation?
A: Yes, absolutely. We can supply the valve pre-assembled with pneumatic actuators (double-acting or spring-return) from reputable brands, complete with solenoid valves and limit switches as per your control system requirements. This is a common configuration for automated ballast or cooling systems.
Q4: Are spare parts like EPDM seals available?
A: Yes, we maintain an inventory of critical spare parts, including complete EPDM seat rings, stem seals (O-rings), and discs. Providing spare parts ensures you can perform onboard maintenance swiftly, minimizing vessel downtime.
Q5: What documentation accompanies the valve?
A: Each valve shipment typically includes a material certificate, a pressure test certificate (hydrostatic and seat leakage test), a detailed dimensional drawing, and a manual. Certificates of conformity to specific standards can be provided upon request.
Q6: What is the lead time for an order of 10 units of DN400 valves?
A: For standard configuration (lever operated, epoxy coated), lead time is generally 4-6 weeks. For orders involving customized actuation or special coatings, please consult with our sales team for an accurate timeline based on current production schedules.
Q7: Do you offer different seal materials besides EPDM?
A: Yes. While EPDM is the standard for seawater applications, we can provide NBR for oil-based fluids or Viton (FKM) for higher temperature and chemical resistance. The choice depends on your specific media and temperature conditions.
Q8: How do you ensure quality control?
A: Our manufacturing process is governed by an ISO9001 quality management system. Every valve undergoes rigorous in-process inspections and final testing, including a hydrostatic shell test at 1.5 times the rated pressure and a seat leakage test. This systematic approach guarantees that every product leaving our factory meets its specified performance criteria.
Backed by years of manufacturing expertise since 2016 and a proven track record of exporting to diverse markets across North America, Europe, Asia, Africa, and Oceania, Shanghai Zhibang Valve stands as a reliable partner for your marine valve needs. Our annual export value reflects consistent customer trust and satisfaction. We offer flexible shipment options from major Chinese ports, ensuring your valves reach you efficiently. Choose our DN400 Marine Lug Butterfly Valve for a solution that delivers strength, reliability, and ease of maintenance in the toughest marine environments. Contact us today for a detailed quotation or to discuss your specific project requirements.
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