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Help CenterJIS F7481 Butterfly Valve for Marine Applications, With Manual Gearbox or Pneumatic Actuator
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents the JIS F7481 Butterfly Valve for Marine Applications, a high-performance solution designed to meet the rigorous demands of shipbuilding and offshore industries. Manufactured under ISO9001 quality management system since 2016, our valves are exported to over 15 countries and regions worldwide, including North America, Europe, Southeast Asia, and Oceania. With annual export value exceeding US$1 million, we combine advanced engineering with reliable service to deliver valves that ensure leak-free operation and long service life in seawater, ballast, cooling water, and fire-fighting systems.
This butterfly valve complies with JIS F7481 (Japanese Industrial Standard for shipbuilding) and is available with either a manual gearbox or pneumatic actuator to suit different operational environments. The manual gearbox provides precise throttling and easy manual override, while the pneumatic actuator enables remote control and automation, ideal for integrated vessel management systems. Both options are engineered for corrosion resistance and low maintenance, making them a cost-effective choice for marine engineers.
Key Features & Technical Specifications
- Compliance with JIS F7481: Ensures dimensional interchangeability and compatibility with Japanese-standard marine piping systems.
- Durable construction: Body and disc available in cast iron, ductile iron, or stainless steel (SS304/SS316); seat options include EPDM, PTFE, and Viton for a wide range of fluid compatibility.
- Bidirectional sealing: Zero leakage at low pressure, meeting marine safety requirements.
- Flexible operation: Choose manual gearbox for cost-effective local control or pneumatic actuator for automated systems (double-acting or spring-return).
- Corrosion-resistant coating: Epoxy coating with NACE or shipyard standards available upon request.
- Easy installation: Wafer or lug-style connection fits between standard JIS flanges; compact design saves space.
- Low torque operation: Optimized disc profile reduces actuation force, prolonging actuator life.
| Parameter | Value |
|---|---|
| Size Range | DN50 – DN600 (2" – 24") |
| Pressure Rating | JIS 5K / 10K / 16K |
| Face-to-Face Dimension | Per JIS F7481 / ISO 5752 |
| Test Pressure (Shell) | 1.5 x Rated Pressure |
| Test Pressure (Seat) | 1.1 x Rated Pressure |
| Applicable Media | Fresh water, sea water, ballast, bilge, fire-fighting |
| Temperature Range | -20°C to +120°C (EPDM seat); up to +200°C (PTFE/Viton) |
| Actuator Options | Manual gearbox with handwheel; pneumatic actuator (double-acting/spring-return) with solenoid valve, limit switch, positioner (optional) |
Advantages for Marine Applications
- Seawater Resistance: Disc and seat materials specifically selected to withstand corrosive marine environments; optional nickel-aluminum bronze disc for extreme conditions.
- Space-Saving Design: Butterfly valves are inherently compact and lightweight compared to gate or globe valves, reducing piping support requirements.
- Low Maintenance: Few moving parts and a resilient seat reduce the need for frequent servicing. The manual gearbox requires only occasional lubrication; pneumatic actuators have long-life seals.
- Automation Ready: Pneumatic actuator version can be integrated with ship automation systems for remote monitoring and control, enhancing safety and operational efficiency.
Why Choose Shanghai Zhibang Valve?
Since 2016, we have been dedicated to manufacturing valves that meet international standards. Our ISO9001 certified factory ensures consistent quality through strict raw material inspection, CNC machining, assembly, and hydrostatic/pneumatic testing. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports, offering flexible logistics to clients across North America, South America, Europe, Africa, Oceania, and Asia. With annual export value of US$1–1.5 million, we have built long-term partnerships with shipyards, offshore contractors, and marine equipment distributors. Our technical team provides free consultation on valve selection, actuator sizing, and special coating requirements. Every valve comes with a test certificate and 12-month warranty. Contact us now for a quote or sample testing!
Frequently Asked Questions (FAQ)
Q1: What is the difference between JIS F7481 and other butterfly valve standards?
A: JIS F7481 is specifically designed for marine applications in Japan and aligns with shipbuilding requirements. It defines specific face-to-face dimensions, pressure-temperature ratings, and materials suitable for seawater systems. It differs from API 609 or BS EN 593 in dimensional standards.
Q2: Can I use this valve for fuel oil or hydraulic oil systems?
A: Yes, but proper seat material selection is critical. We recommend PTFE or Viton seats for hydrocarbon fluids. Please provide media details, and our engineers will advise on compatibility.
Q3: How do I choose between manual gearbox and pneumatic actuator?
A: Manual gearbox is suitable for valves that are operated infrequently or in locations where power is unavailable. Pneumatic actuator is ideal for automated systems, remote operation, or when quick emergency shut-off is required. We can also supply both options for the same valve size.
Q4: What is the typical lead time for this valve?
A: For standard sizes (DN50–DN300) with common materials and manual gearbox, lead time is 15–20 days. For pneumatic actuator and larger sizes, 25–35 days depending on actuator specifications. We can expedite orders for urgent projects.
Q5: Is the valve suitable for below-waterline installation?
A: Yes, our butterfly valves are designed for marine applications including ballast tanks and sea chests. However, we recommend using stainless steel disc and shaft for below-waterline service to prevent galvanic corrosion. Optional extensions for deep installation are available.
Q6: Do you offer customization for end connections (e.g., grooved ends or special flange drilling)?
A: We offer lug-style connections as standard, and wafer-style is also available. Special flange drilling (ANSI, PN, etc.) can be customized per request, but lead time may increase. Please contact us with your specific requirements.
Q7: How do you ensure valve quality before shipment?
A: Every valve undergoes hydrostatic shell test, seat leak test, and visual inspection per ISO9001 procedures. Pneumatic actuators are functionally tested with air supply. A test certificate is issued for each batch. Third-party inspection (e.g., BV, DNV) is available at additional cost.
Q8: What is the warranty period for this product?
A: We provide a 12-month warranty from the date of shipment against manufacturing defects. For actuator accessories (solenoid, limit switch), standard warranty is 6 months. Extended warranty options can be negotiated.
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