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Help CenterJIS F7481 5K Wafer Butterfly Valve DN50 DNV BV Approved for Marine Applications
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As a specialized manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our JIS F7481 5K Wafer Butterfly Valve DN50, designed specifically for demanding marine and offshore applications. This valve is engineered to meet the rigorous standards of the maritime industry, featuring DNV BV approval, which signifies its compliance with stringent safety and performance criteria for shipboard use. With our commitment to quality backed by ISO9001 certification, we deliver reliable flow control solutions that ensure operational integrity in critical marine systems, from ballast and cooling water to fuel oil and general service lines.
Product Overview & Core Design
This wafer-style butterfly valve is constructed for compact installation between ANSI or JIS standard flanges, making it ideal for space-constrained engine rooms and piping systems on vessels. The 5K pressure rating (approximately equivalent to PN10) provides a robust working pressure capability suitable for a wide range of shipboard services.
- Superior Sealing Performance: The valve utilizes a precision-machined disc and a resilient seat (options include EPDM for fresh/sea water, NBR for oils, or PTFE for chemicals) to ensure bubble-tight shut-off, minimizing leakage and preventing system contamination.
- Corrosion Resistance: Critical components like the disc and stem are typically manufactured from stainless steel (304/316), offering excellent resistance to saltwater corrosion, extending service life, and reducing maintenance frequency in harsh marine environments.
- Robust & Compact Wafer Design: The wafer design provides a lightweight yet sturdy solution that simplifies installation and reduces the overall weight burden on ship piping—a crucial factor in marine engineering.
- Versatile Actuation: Available with a standard lever for manual operation, a gearbox for higher torque applications, or prepared for the installation of pneumatic/electric actuators for remote or automated control systems.
- Low Torque Operation: The optimized disc design ensures low operating torque, allowing for easier manual operation or enabling the use of smaller, more cost-effective actuators.
Technical Specifications & Configuration
The following table outlines key specifications and available options for this marine-grade butterfly valve. Specific material grades and seat options can be customized based on your application's fluid media and operational parameters.
| Specification | Details |
| Design Standard | JIS F7481 (Japanese Industrial Standard for Ship Valves) |
| Nominal Diameter | DN50 (2") |
| Pressure Class | 5K (Max. Working Pressure: ~1.0 MPa) |
| Face-to-Face | As per JIS B 2032 / ISO 5752 Series 14 |
| Flange Standard | JIS B 2212 5K RF Flange (compatible with ANSI 150#) |
| Body Material Options | Cast Iron (FC200), Ductile Iron (FCD450), Stainless Steel CF8/CF8M |
| Disc Material Options | Stainless Steel 304 (CF8), Stainless Steel 316 (CF8M), Aluminum Bronze |
| Stem Material | Stainless Steel 420/304/316, Monel (optional) |
| Seat Material Options | EPDM (Water), NBR (Oil), PTFE/Viton (Chemicals/High Temp) |
| Temperature Range | Dependent on seat material: EPDM (-20°C to 120°C), PTFE (-20°C to 200°C) |
| Operation | Lever Handle, Worm Gear Operator, Pneumatic/ Electric Actuator (Optional) |
| Approval | DNV BV Type Approval Certificate for Marine Use |
Benefits for Your Marine Operations
- Enhanced System Reliability: The DNV BV approval is a globally recognized mark of quality and safety in the maritime sector, giving you confidence in the valve's performance and compliance with classification society rules.
- Reduced Lifetime Cost: Durable materials and a robust design minimize the risk of failure and the need for frequent replacements, leading to lower total cost of ownership.
- Global Supply Chain Compatibility: Conforming to JIS F7481 ensures interchangeability and compatibility with existing Japanese and international shipbuilding standards, simplifying procurement and maintenance.
- Flexibility for Various Services: Suitable for a broad spectrum of shipboard applications including ballast water, seawater cooling, firefighting systems, fuel oil, lubricating oil, and bilge lines.
- Streamlined Installation & Maintenance: The wafer design allows for quick installation between flanges without needing nuts on the valve side, and the simple design facilitates easy inspection and seat replacement if necessary.
With an annual export value ranging between US$1 Million and US$1.5 Million and a presence in key global markets including North America, Europe, Southeast Asia, and the Middle East, Shanghai Zhibang has established itself as a trusted partner for marine valve solutions. Our products are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics to shipyards and marine equipment suppliers worldwide. Choosing our JIS F7481 DNV-approved butterfly valve means investing in a component that prioritizes safety, durability, and performance under the toughest conditions at sea. Contact us today to discuss your specific requirements, request a detailed quotation, or learn more about our full range of marine-certified valves.
Frequently Asked Questions (FAQ)
Q1: What does "5K" pressure rating mean in practical terms?
A1: The "5K" designation is a Japanese Industrial Standard (JIS) pressure class. It indicates a nominal pressure rating of approximately 0.98 MPa (10 kgf/cm²), which is roughly equivalent to PN10 or ANSI Class 150. This means the valve is suitable for working pressures up to this level in marine service.
Q2: Is this valve only suitable for new shipbuilding, or can it be used for retrofitting existing vessels?
A2: It is perfectly suited for both. Its compliance with JIS F7481 ensures it meets common standards used in shipbuilding, making it an ideal direct replacement for existing valves in maintenance, repair, and overhaul (MRO) operations on older vessels that use JIS or compatible flange standards.
Q3: What is the significance of the DNV BV approval?
A3: DNV (Det Norske Veritas) and BV (Bureau Veritas) are leading international marine classification societies. Their approval means the valve design has been reviewed and tested, and the manufacturing process is audited to ensure it consistently meets specific safety, material, and performance standards required for use on ships classed by these societies.
Q4: Can this valve be supplied with different seat materials? What is the standard?
A4> Yes, seat material is customizable. The standard offering is typically EPDM for general water service due to its good seawater resistance. For oil-based fluids, NBR is common. For aggressive chemicals or higher temperatures, PTFE or Viton seats are available upon request. The choice depends entirely on your specific fluid media.
Q5: Does the "wafer" design mean it has lower pressure resistance than a lug-type butterfly valve?
A5: Not necessarily for this pressure class. The wafer design is compact and relies on the line flanges to hold it in place and absorb pipeline loads. For DN50 size at 5K pressure, the wafer design is fully adequate, cost-effective, and lighter. Lug-type valves are often used for end-of-line service or where the valve needs to be a pipeline anchor point.
Q6: Are actuators available directly from you?
A6> We can supply the valve prepared for actuator mounting (with a squared drive shaft and mounting pads). We also offer optional pneumatic or electric actuators from reputable brands. We can provide a complete, assembled package tailored to your automation requirements.
Q7: What is the typical lead time for an order of these valves?
A7> For standard configurations with common materials (e.g., cast iron body, SS disc, EPDM seat), lead times are generally competitive. Exact lead times depend on order quantity and current production schedule. We provide clear timelines upon receipt of your inquiry to facilitate your project planning.
Q8: Do you provide documentation like test certificates and approval papers?
A8> Yes. For DNV BV approved products, we provide the relevant type approval certificate copies. We also supply standard material test reports (MTRs) and can provide factory acceptance test (FAT) reports, including shell test and seat leak test results, as per customer request.
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