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As a specialized manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. leverages its expertise and modern production facilities to deliver high-performance fluid control solutions. Our Ductile Iron Marine Butterfly Valve, engineered in strict compliance with the GB/T3036 standard, is a robust and reliable choice for demanding marine and offshore applications. Designed for durability and ease of operation, this valve ensures secure isolation and regulation of seawater, ballast, cooling, and other shipboard systems. We understand the critical need for corrosion resistance and operational safety in maritime environments, which is why this valve is built to withstand harsh conditions while providing long service life. With a commitment to quality certified by ISO9001, we offer a product that combines technical precision with practical value for shipbuilders, repair yards, and marine equipment suppliers worldwide.
Core Features & Technical Advantages:
- Superior Material Construction: The valve body and disc are manufactured from high-grade ductile iron (nodular cast iron), providing excellent tensile strength, impact resistance, and pressure-bearing capabilities superior to standard cast iron. The stem is typically made of stainless steel (e.g., 304, 316, 17-4PH) for enhanced corrosion resistance and torsional strength.
- Optimized for Marine Service: Specifically designed for seawater, ballast, fire-fighting, and bilge systems. The design minimizes internal cavities to reduce sediment buildup and features corrosion-resistant coatings or material selections to combat saltwater exposure.
- Reliable Sealing Performance: Utilizes a resilient seat (EPDM, NBR, Viton, or PTFE) that ensures bubble-tight shut-off and compensates for minor disc misalignment. The seat is often integrally molded or securely locked to prevent blow-out under pressure or vacuum conditions.
- Compact & Lightweight Design: The wafer or lug style body offers a space-saving and weight-reducing advantage compared to gate or globe valves, simplifying installation in confined engine rooms and piping spaces.
- Versatile Actuation Options: Available with manual lever, gear operator, electric actuator, or pneumatic actuator to suit different levels of automation, remote control needs, and torque requirements for large-diameter valves.
- Low Operating Torque & Easy Maintenance: The symmetrical disc design and low-friction seat/bearing arrangement result in low operating torque. The simple design allows for easy in-line maintenance, often requiring only the removal of the actuator and stem to replace the seat.
Key Technical Specifications:
| Parameter | Specification |
| Body Material | Ductile Iron (GGG40/50), Epoxy Coated |
| Disc Material | Ductile Iron, Nylon Coated or Stainless Steel |
| Stem Material | Stainless Steel (AISI 304, 316, 17-4PH) |
| Seat Material | EPDM, NBR, Viton, PTFE (Standard: EPDM) |
| Design Standard | GB/T 3036, Equivalent to ISO 5752 Basic Series 20 |
| Face-to-Face | As per GB/T 3036 / ISO 5752 |
| Pressure Rating | PN10, PN16, PN25; ANSI Class 150 |
| Temperature Range | -10°C to +120°C (with EPDM seat) |
| Leakage Class | Class A (Zero Leakage) per API 598 / ISO 5208 |
Benefits for Your Business:
- Enhanced System Reliability: Reduces the risk of in-service failure in critical marine systems, minimizing downtime and costly repairs for vessel operators.
- Cost-Effective Lifecycle: The durability of ductile iron and corrosion-resistant components extends maintenance intervals and replacement cycles, lowering total cost of ownership.
- Simplified Procurement & Compliance: Full compliance with GB/T3036 and common international standards (ISO, API) ensures the valve meets the specifications required by many shipyards and classification societies, streamlining your approval process.
- Flexible Supply Chain Support: With annual export experience and major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely and reliable delivery to global markets including North America, Europe, Southeast Asia, and the Middle East.
Shanghai Zhibang Valve Manufacture Co., Ltd. brings nearly a decade of focused manufacturing experience and a proven export track record, with annual exports valued between US$1-1.5 million, serving diverse markets across six continents. Our ISO9001-certified quality management system underpins every stage of production, from raw material inspection to final testing, ensuring each Ductile Iron Marine Butterfly Valve meets stringent performance criteria. We are positioned as a reliable partner for B2B clients seeking quality, compliance, and value. For your next marine project requiring dependable and standards-compliant valves, contact us to discuss your specifications, request a quotation, or arrange for product samples.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of using ductile iron over cast iron for this marine valve?
A: Ductile iron offers significantly higher tensile strength, impact toughness, and elongation compared to gray cast iron. This makes the valve more resistant to shock loads, pressure surges, and potential mechanical damage encountered in marine environments, ensuring greater safety and longevity.
Q2: Is this valve suitable for seawater applications?
A: Yes, it is specifically designed for marine use. We recommend specifying appropriate materials such as a 316 stainless steel stem and an EPDM or Viton seat for optimal corrosion resistance against seawater. The standard epoxy coating on the ductile iron body provides an additional protective barrier.
Q3: Can this valve be operated remotely on a ship?
A: Absolutely. While manual lever and gear operators are standard, this valve can be easily fitted with electric or pneumatic actuators for remote and automated control, which is common in modern shipboard systems for ballast, fuel, and cooling water management.
Q4: What certifications do you provide with the valve?
A> Our manufacturing facility is ISO9001 certified. The valves are produced in compliance with GB/T3036. Specific material certificates (MTC) and test reports (hydrostatic, seat leakage) can be provided upon request to meet classification society requirements (e.g., ABS, DNV, BV, LR).
Q5: What is the delivery lead time for standard sizes?
A> For standard sizes (DN50-DN600) and configurations, typical lead time is 30-45 days after order confirmation. Larger sizes or valves with special actuators/coatings may require additional production time. We maintain a strategic inventory of common items for faster dispatch.
Q6: Do you offer custom modifications, such as special coatings or extended stems?
A> Yes, as a manufacturer, we offer customization. Modifications like high-performance epoxy coatings (Hempel, International), insulated stems, locking devices, or special position indicators can be arranged. Please discuss your specific requirements with our technical team.
Q7: How do you ensure the valve's sealing performance over time?
A> The resilient seat design provides excellent initial sealing. The seat material is selected for compatibility with the service medium and temperature. The low-friction design and robust stem/bearing arrangement minimize wear. For long-term performance, we recommend following proper installation guidelines and periodic operational checks.
Q8: What after-sales support do you provide?
A> We provide detailed installation and maintenance manuals. Technical support is available for installation queries. We also supply genuine spare parts like seats, seals, and stems to ensure the continued performance of your valves.
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