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Help CenterCB/T3591 Marine Gate Valve For Freshwater, Ductile Iron Body With Epoxy Coating, DN50-DN300
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As a leading manufacturer with a strong commitment to maritime fluid control solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our specialized CB/T3591 Marine Gate Valve. Engineered specifically for freshwater applications aboard ships and offshore platforms, this valve combines the robust strength of ductile iron with superior corrosion protection, ensuring reliable isolation and flow control in demanding marine environments. Our years of expertise, backed by a systematic ISO9001 quality management process, are focused on delivering valves that meet the precise needs of shipbuilders, repair yards, and marine equipment suppliers worldwide. This product exemplifies our dedication to providing durable, specification-compliant components that contribute to the safety and efficiency of vessel operations.
This marine gate valve is designed as a critical component for managing freshwater lines, including potable water, cooling water, and ballast systems. Its construction and features are tailored to withstand the unique challenges of the maritime industry.
- Robust Construction with Superior Protection: The valve body is crafted from high-grade ductile iron, known for its excellent tensile strength and impact resistance. To combat corrosion from salt-laden atmospheres and varying water qualities, the interior and exterior surfaces are coated with a high-performance epoxy coating. This coating provides a durable, non-porous barrier that significantly extends the valve's service life compared to standard painted finishes.
- Precise Flow Control and Tight Shut-off: Featuring a rising stem design with a non-rotating stem tip, the valve ensures smooth, low-friction operation. The wedge disc, typically faced with bronze or stainless steel, mates with a similarly faced seat to provide a bubble-tight seal when closed, preventing leakage and ensuring system integrity.
- Designed for Marine Serviceability: The valve is built for easy maintenance and operation in confined engine room spaces. A standard handwheel offers manual control, while a gearbox operator is available as an option for larger sizes (typically DN200 and above) or applications requiring reduced operating torque. The flanged ends conform to common marine standards, facilitating straightforward installation into existing piping networks.
- Compliance and Reliability: Manufactured in accordance with the Chinese CB/T3591 standard for marine valves, this product is developed to meet the general requirements for design, materials, and testing in shipboard applications. This adherence to a recognized standard provides assurance of its suitability for marine use.
Key Technical Specifications:
| Parameter | Specification |
| Product Standard | CB/T3591 |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300 |
| Pressure Rating | PN10, PN16 (Standard) |
| Body Material | Ductile Iron (QT450-10) |
| Coating | Epoxy Powder Coating (~250μm) |
| Stem Material | Stainless Steel (2Cr13 or equivalent) |
| Seat & Disc Seal | Bronze / Stainless Steel |
| Packing | Graphite-based or PTFE |
| Test Standards | Shell Test, Seat Test per relevant standards |
Advantages and Customer Benefits:
- Enhanced Durability: The epoxy-coated ductile iron construction offers a cost-effective solution with far better corrosion resistance than standard cast iron, reducing replacement frequency and lifecycle costs.
- Operational Reliability: The robust design ensures consistent performance and tight shut-off, which is crucial for system isolation during maintenance or emergencies on a vessel.
- Global Supply Chain Support: With annual export values between US$1-1.5 million and major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely and efficient logistics to key maritime markets including North America, Europe, Southeast Asia, and Africa.
- Quality Assurance: Our ISO9001 certification underpins every stage of production, from material sourcing to final testing, giving you confidence in the consistency and quality of every valve you receive.
For shipowners, naval architects, and marine engineers, choosing the Shanghai Zhibang CB/T3591 Marine Gate Valve means selecting a component backed by nearly a decade of manufacturing specialization. Our established presence in over a dozen global markets, from Eastern Europe to Oceania, is a testament to the reliability and acceptance of our products. We understand the critical nature of marine components and build our valves to deliver unwavering performance. Let our expertise in marine valve solutions contribute to the success of your next project. Contact us today for detailed quotations, technical data sheets, or to discuss custom requirements for your specific freshwater system needs.
Frequently Asked Questions (FAQ)
Q1: Is this valve suitable for seawater applications?
A1: No, this specific model is designed and recommended for freshwater systems only, such as potable water, cooling freshwater, and tank filling lines. The epoxy coating provides excellent protection against general corrosion and some chemicals but is not typically specified for continuous seawater service. We offer other valve models with materials like bronze or super duplex stainless steel for seawater duties.
Q2: What are the temperature and pressure limits for this valve?
A2: The standard pressure ratings are PN10 and PN16. The operational temperature range is typically from -10°C to 120°C, making it suitable for most ambient and heated freshwater applications on vessels. For specific high-temperature uses, please consult our technical team.
Q3: Are the flanges drilled to a specific standard?
A3: Yes, the flanges are generally drilled to common marine and industrial standards such as ISO 7005-2 or ANSI B16.5 (upon request). It is crucial to specify your required flange standard (e.g., PN10/16, Class 150) at the time of inquiry to ensure compatibility with your existing piping.
Q4: Do you offer actuators for automated operation?
A4: While the valve is supplied with a manual handwheel or optional gear operator, it can be configured to accept electric, pneumatic, or hydraulic actuators. Actuator mounting kits and specific actuator models are available upon request as part of a customized package.
Q5: What is the lead time for an order of DN200 valves?
A5: Lead times vary based on order quantity and current production schedule. For standard specifications, typical lead times range from 4 to 8 weeks. We recommend contacting our sales department with your specific quantity and delivery requirements for an accurate timeline.
Q6: What documentation is provided with the valves?
A6: Each shipment is accompanied by a commercial invoice, packing list, and a certificate of conformity. Material certificates and test reports (e.g., for shell and seat pressure tests) can be provided upon request.
Q7: Can you provide valves with different end connections, like threaded ends?
A7: The standard design features flanged ends. Threaded ends (NPT, BSP) can be accommodated for smaller sizes, typically up to DN80, as a special order. Please discuss your connection requirements during the quotation process.
Q8: How does the epoxy coating compare to galvanizing?
A8: Epoxy powder coating generally offers superior adhesion, chemical resistance, and a more uniform, pinhole-free finish compared to hot-dip galvanizing. It provides excellent barrier protection against corrosion and is less prone to damage during handling and installation. For marine atmospheric exposure, a quality epoxy coating is often the preferred choice.
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