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DNV Approved Marine Butterfly Valve DN50-DN300 Corrosion Resistant for Sewage
Product Spotlights
DNV-certified marine butterfly valves (DN50-DN300) designed for harsh sewage and seawater service. Features corrosion-resistant construction with materials like coated ductile iron/SS316, bubble-tight sealing, and low-torque operation. Available in wafer/lug/flanged types with EPDM/NBR/Viton seats. Ensures regulatory compliance, reduces lifecycle costs, and enhances system reliability for ballast, bilge, and sewage applications. ISO9001 manufacturer with global export reach.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
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Application:
Other, Marine sewage systems
Material:
Corrosion resistant alloy/cast iron/ductile iron
Size Range:
DN50 to DN300 (2“ to 12“)
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Application
Other, Marine sewage systems
Material
Corrosion resistant alloy/cast iron/ductile iron
Size Range
DN50 to DN300 (2“ to 12“)
Approval
DNV (Det Norske Veritas) Approved
Connection Type
Wafer, Lug, Flanged (options available)
Seat Material
EPDM, NBR, Viton (optional)
Operation
Lever, gear, pneumatic, electric actuator
Pressure Rating
PN10, PN16, Class 150 (customizable)
Design Standard
ISO 5752, API 609, MSS SP-67
Temperature Range
-20°C to +120°C (depending on seat)
As a professional valve manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance, certified fluid control solutions for demanding marine and industrial applications. Our DNV Approved Marine Butterfly Valves, designed specifically for sewage and corrosive media handling, represent our commitment to quality, reliability, and meeting stringent international maritime standards. With an annual export value reflecting our global reach across North America, Europe, Asia, and beyond, we understand the critical need for durable valves that ensure operational safety and environmental compliance on vessels worldwide.
This series of corrosion-resistant butterfly valves is engineered to deliver exceptional service life in harsh marine environments, particularly in sewage, ballast, and bilge systems where reliability is non-negotiable.
Core Product Features & Technical Advantages:
- DNV Certification Assurance: Each valve is manufactured and tested in compliance with Det Norske Veritas standards, providing documented proof of suitability for marine use. This certification is crucial for vessel classification and insurance purposes.
- Superior Corrosion Resistance: Constructed from specially selected materials and coatings to withstand aggressive sewage, saline water, and chemical-laden fluids. Key wetted parts are designed to resist pitting, crevice corrosion, and erosion.
- Robust & Leak-Tight Design: Features a precision-machined disc and a resilient seat that ensures a bubble-tight seal in both directions, preventing leakage and contamination—a critical factor for sewage and environmental control systems.
- Low Torque & Easy Operation: The streamlined disc design and low-friction seat material minimize operating torque, allowing for smooth manual operation with a lever or gearbox, and reducing the size requirement for automated actuators.
- Versatile Configuration Options: Available in wafer, lug, or double-flanged body styles to suit different piping system requirements. Multiple seat and seal material options (EPDM, NBR, Viton) allow customization for specific fluid compatibility and temperature ranges.
- Low Maintenance & Long Service Life: The simple design with minimal moving parts reduces the need for frequent maintenance. The corrosion-resistant materials extend the valve's lifespan even in constant exposure to challenging media.
Primary Technical Specifications:
| Parameter | Specification / Range |
| Valve Size (Nominal Diameter) | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 |
| Pressure Rating | PN10, PN16, Class 150 (Standard). Higher ratings available upon request. |
| Body Material | Ductile Iron (epoxy coated), Cast Iron, Cast Steel, Stainless Steel (316/316L) |
| Disc Material | Stainless Steel (304/316), Ductile Iron with Ni-plating or coating |
| Stem Material | Stainless Steel (416/304/316) for high strength and corrosion resistance |
| Seat Material | EPDM (Standard for water/sewage), NBR, Viton, PTFE (Optional) |
| Operation Type | Lever Handle, Gear Operator, Pneumatic Actuator, Electric Actuator |
| Temperature Range (with EPDM seat) | -20°C to +120°C |
| Face-to-Face Dimension | Complies with ISO 5752 / API 609 / MSS SP-67 standards |
| Flange Standard | ISO, DIN, ANSI, JIS, BS (Specify requirement) |
Key Benefits for Your Project:
- Regulatory Compliance: The DNV approval facilitates smoother vessel surveys and certifications, reducing project delays and compliance risks.
- Reduced Lifecycle Cost: High durability and low maintenance requirements lead to significant savings on repair, replacement, and downtime over the valve's operational life.
- Enhanced System Reliability: Reliable performance in critical sewage and ballast systems minimizes the risk of system failure, environmental spills, and operational disruptions.
- Design Flexibility: The wide range of sizes, materials, and actuator options allows engineers to select the optimal valve for each specific point in the piping system.
- Global Supply & Support: Sourced from an ISO9001-certified manufacturer with established export channels through major ports like Shanghai, Guangzhou, and Hong Kong, ensuring reliable delivery to global shipyards and marine projects.
Frequently Asked Questions (FAQ):
-
Q: What does "DNV Approved" mean for this butterfly valve?
A: "DNV Approved" indicates that the valve's design, materials, manufacturing process, and testing procedures have been assessed and certified by Det Norske Veritas, a leading international maritime classification society. This approval is often required for valves used on classified vessels to ensure they meet specific safety, performance, and quality standards for marine service. -
Q: Is this valve suitable for seawater ballast systems as well as sewage?
A: Yes, absolutely. The corrosion-resistant materials and construction that make it suitable for aggressive sewage also make it an excellent choice for seawater ballast, bilge, and other saltwater service applications. Material selection (e.g., 316 stainless steel components) can be optimized for the specific fluid. -
Q: Can I get these valves with pneumatic or electric actuators?
A: Yes. The valves are designed to be compatible with a wide range of quarter-turn actuators. We can supply the valve as a manual unit (lever or gear) or as a complete package with a mounted pneumatic or electric actuator. Please specify your required torque, control signal, and fail-safe mode when inquiring. -
Q: What is the lead time for an order of DN50-DN300 valves?
A: Lead time depends on the order quantity, specific material configuration, and actuator requirements. Standard material configurations are typically available from stock or have shorter production cycles. We provide accurate lead time estimates with every quotation to help with your project planning. -
Q: Do you provide documentation with the valves, such as test certificates?
A: Yes. Each valve shipment is accompanied by essential documentation, which typically includes a material certificate, a hydrostatic test certificate, and for DNV-approved units, the relevant DNV certification documents. This paperwork is crucial for your quality records and regulatory compliance. -
Q: How do I select the right seat material (EPDM, NBR, Viton) for my application?
A: Seat material selection is based on the fluid's chemical composition and temperature. EPDM is standard for fresh water, sewage, and seawater up to 120°C. NBR is suitable for oils and fuels at moderate temperatures. Viton (FKM) offers superior resistance to a broader range of chemicals and higher temperatures. Our technical team can assist you in selecting the optimal material. -
Q: Are spare parts like seals and discs available for future maintenance?
A: Yes. As the manufacturer, we maintain an inventory of critical spare parts for our valve models. We recommend identifying the valve model and serial number (provided with the valve) when ordering spare parts to ensure perfect compatibility. -
Q: What packaging is used for export shipment to prevent damage?
A: Valves are carefully packed in wooden crates or strong export cartons. Flanges and mating surfaces are protected with covers. Actuators, if attached, are secured to prevent movement during transit. We have extensive experience shipping to global destinations via our main ports.
Backed by our ISO9001 quality management system and a proven track record of supplying valves across six continents—from North America and Western Europe to Southeast Asia and Africa—Shanghai Zhibang offers more than just a product; we offer a reliable partnership for your marine fluid control needs. Our consistent annual export performance demonstrates our capability to meet international quality expectations and delivery schedules. Choose our DNV Approved Marine Butterfly Valves to integrate certified reliability, robust corrosion resistance, and manufacturer-direct value into your vessel's critical systems. Contact us today with your size, pressure, and material requirements for a detailed quotation and technical support.
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1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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