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Help CenterCast Iron Body Marine Butterfly Valve for Seawater, GB/T3036 Compliant, DN50 to DN600 Sizes
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As a leading manufacturer in the valve industry since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing robust and reliable fluid control solutions for demanding marine environments. Our Cast Iron Body Marine Butterfly Valve is engineered specifically to handle the corrosive challenges of seawater systems, offering exceptional durability and long service life. Designed in compliance with the GB/T3036 standard and available in a comprehensive size range from DN50 to DN600, this valve is a cornerstone for shipbuilding, offshore platforms, and coastal industrial applications where failure is not an option. We combine rigorous manufacturing processes under our ISO9001 quality management system with a deep understanding of maritime requirements to deliver products that global partners can trust.
This valve stands out due to its specialized design and material selection. The cast iron body provides excellent structural integrity and corrosion resistance, which is further enhanced by high-quality internal coatings or linings suitable for seawater. The compact and lightweight butterfly valve design ensures easy installation and maintenance, even in the confined spaces typical of ship engine rooms and piping systems.
- Superior Corrosion Resistance: The valve body and components are treated or coated to withstand the highly corrosive nature of seawater, brine, and other marine fluids, significantly reducing maintenance frequency and costs.
- Robust and Leak-Tight Sealing: Features a resilient seat (options like EPDM, NBR, or PTFE) that ensures a bubble-tight seal in both directions, preventing seawater ingress and ensuring system integrity.
- Easy Operation and Low Torque: The disc design and bearing system minimize operating torque, allowing for smooth manual operation with a lever or gearbox, and enabling efficient actuation with pneumatic or electric actuators.
- Versatile Configuration Options: Available in wafer or lug body styles to suit different piping connection requirements. Various disc and seat material combinations are offered to match specific fluid compatibility and temperature needs.
- Long Service Life: Engineered for durability with minimal wear parts, ensuring reliable performance over extended periods, which is critical for marine applications where downtime is costly.
The technical specifications of our marine butterfly valve are tailored for performance. Below is a summary of key parameters:
| Parameter | Details |
| Product Standard | GB/T3036 |
| Size Range (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600 |
| Pressure Rating (PN) | PN10, PN16 (Other ratings available upon request) |
| Body Style | Wafer Type, Lug Type (Optional) |
| Seat Material Options | EPDM, NBR, PTFE, or other resilient materials |
| Disc Material Options | Cast Iron, Ductile Iron, Stainless Steel (e.g., CF8, CF8M) |
| Stem Material | Stainless Steel (Standard) |
| Test Standards | Shell Test, Seat Leakage Test per relevant standards |
For clients, the primary benefits are clear: enhanced system reliability leading to reduced operational risks, lower total cost of ownership through durability and easy maintenance, and design flexibility with multiple configuration choices to fit exact project specifications. Whether it's for ballast water systems, cooling seawater lines, firefighting systems, or general service aboard vessels, this valve provides a dependable shut-off and regulating solution.
Shanghai Zhibang's commitment to quality is demonstrated by our ISO9001 certification, ensuring consistent production standards. With an annual export value ranging between US$1 Million to US$1.5 Million, we have established a strong global presence, serving markets across North and South America, Europe, Asia, Africa, and Oceania from key ports like Shanghai, Guangzhou, and Hong Kong. This extensive experience in international trade means we understand the documentation, logistics, and technical support needs of diverse clients. Choose our Cast Iron Body Marine Butterfly Valve for a product backed by manufacturing expertise, a proven quality system, and a track record of supplying reliable components to the global maritime industry. Contact us today to discuss your project requirements or to request detailed quotations and technical data sheets.
Q1: Is this valve suitable for full immersion in seawater?
A1: The cast iron body offers good corrosion resistance, but for full immersion or highly aggressive conditions, we recommend specifying additional protective coatings (like epoxy) or alternative disc/stem materials (like stainless steel) to ensure optimal longevity. Please consult our technical team for specific application details.
Q2: What is the difference between wafer and lug type body styles?
A2: A wafer-style valve is installed between two pipe flanges using long bolts. A lug-style valve has threaded inserts (lugs) on the valve body, allowing it to be bolted directly to each flange, which can support the valve weight and allow downstream piping removal. The choice depends on your system design and maintenance requirements.
Q3: Can this valve be operated automatically?
A3: Yes. The valve is designed to be compatible with various pneumatic or electric actuators. We can supply the valve as a manual unit or as a complete package with an actuator, positioner, and other accessories based on your automation needs.
Q4: How does compliance with GB/T3036 benefit me if I'm not in China?
A4: GB/T3036 is a recognized Chinese national standard for butterfly valves that specifies dimensions, materials, pressure ratings, and testing methods. It ensures the product is manufactured to a consistent and verifiable technical specification, providing assurance of quality and interchangeability, which is valued in international projects.
Q5: What seat material is best for seawater service?
A5: EPDM (Ethylene Propylene Diene Monomer) is a common and cost-effective choice for seawater within its temperature range, offering good resistance. For higher temperatures or different chemical exposures, NBR or PTFE may be recommended. Our sales engineers can help you select the most suitable material.
Q6: Do you offer customization for special sizes or pressures?
A6: While our standard range is DN50 to DN600 in PN10/PN16, we have the capability to develop valves for non-standard sizes or higher pressure ratings (like PN25) based on customer project requirements. Please inquire with your specific needs for feasibility and lead time.
Q7: What kind of testing is performed on each valve?
A7: Each valve typically undergoes a shell strength test (hydrostatic test) and a seat leakage test to ensure it meets the specified pressure class and sealing performance standards before shipment. Certified test reports can be provided upon request.
Q8: What is your typical lead time for an order?
A8: Lead time depends on the order quantity, specific configuration, and current production schedule. For standard configurations in moderate quantities, lead time is generally competitive. We provide estimated lead times with every quotation and strive to meet project deadlines.
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