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Help CenterAPI 609 Cast Steel Double Eccentric Butterfly Valve With Gear Operator DN50-DN800
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As a professional valve manufacturer with ISO9001 certification, Shanghai Zhibang Valve is proud to present our high-performance API 609 Cast Steel Double Eccentric Butterfly Valve with Gear Operator. Engineered for demanding industrial applications, this valve series combines robust construction with precise control, offering a reliable solution for critical flow regulation in pipelines from DN50 to DN800. Our commitment to quality, backed by an annual export value exceeding US$1 million to global markets, ensures that every valve delivers consistent performance and durability for your most challenging process requirements.
This valve is designed to address the common limitations of standard butterfly valves, providing superior shut-off capabilities, reduced operating torque, and extended service life in high-pressure and high-temperature environments. The double eccentric (double offset) design is a key feature that minimizes wear on the seat and disc, making it an excellent choice for applications where frequent operation and tight sealing are paramount.
Core Product Features & Technical Advantages:
- API 609 Compliant Design: Manufactured in strict accordance with API Standard 609 for butterfly valves, ensuring dimensional interchangeability, material integrity, and performance reliability for industrial piping systems.
- Double Eccentric (Double Offset) Construction: The disc axis is offset from both the seat centerline and the valve body centerline. This innovative design ensures that the disc only contacts the seat during the final few degrees of closure, drastically reducing friction, wear, and operating torque over the valve's lifetime.
- Robust Gear Operator: Equipped with a precision-engineered gearbox for smooth and efficient manual operation. The gear operator provides significant mechanical advantage, allowing for easy opening and closing of larger size valves (typically DN200 and above) under high differential pressures where a hand lever would be impractical.
- Premium Material Selection: The valve body is crafted from ASTM A216 WCB cast steel, offering excellent strength and corrosion resistance for a wide range of media. The disc is typically made from stainless steel (CF8/CF8M), and seat options include resilient materials like PTFE or metal seats (stainless steel) for higher temperature applications.
- Enhanced Sealing Performance: The double eccentric action creates a cam-like effect during closure, resulting in a tight, uniform seal with minimal seat compression. This design is particularly effective in preventing seat deformation and leakage, even after prolonged cycling.
- Versatile End Connections: Available in wafer, lug, and double flanged designs to suit various piping system requirements and facilitate easy installation and maintenance.
Detailed Technical Specifications:
| Parameter | Specification / Option |
| Design & Manufacturing Standard | API 609, ISO 10631 |
| Size Range (Nominal Diameter) | DN50, DN65, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600, DN700, DN800 |
| Pressure Rating (PN/Class) | PN10/PN16 (150LB), PN25 (300LB), PN40. Custom ratings available. |
| Body Material (Standard) | ASTM A216 WCB (Carbon Steel) |
| Disc Material (Standard) | ASTM A351 CF8 (304 SS) or CF8M (316 SS) |
| Seat Material Options | PTFE, Reinforced PTFE, Stainless Steel Metal Seat |
| Stem Material | Stainless Steel (17-4PH or equivalent) |
| Operation Method | Manual Gear Operator (Standard). Actuator mounting pad is prepared for automated options (pneumatic/electric). |
| Leakage Class | API 609: Class IV (Metal Seat) or Class VI (Soft Seat). |
| Temperature Range | -29°C to 200°C (with PTFE seat). Up to 425°C (with metal seat). |
Benefits for Your Operation:
- Reduced Maintenance & Lifetime Cost: The double eccentric design's low-wear operation translates to less frequent maintenance, lower spare part consumption, and a longer overall service life compared to concentric butterfly valves.
- Operational Safety and Ease: The gear operator allows a single person to safely control large-diameter valves, eliminating the need for excessive force or dangerous tools. The position indicator on the gearbox provides clear visual confirmation of valve status.
- Superior Flow Control: Offers excellent throttling capabilities with a near-linear flow characteristic, making it suitable for applications requiring precise flow modulation, not just on/off service.
- Wide Application Suitability: Ideal for a diverse range of industries including oil and gas production, petrochemical plants, power generation (cooling water, fuel systems), water treatment, HVAC, and general industrial process lines handling water, air, gas, and mild corrosive fluids.
- Global Supply Chain Support: With established export channels to North America, Europe, Southeast Asia, and other major markets, and shipment options from key ports like Shanghai, Guangzhou, and Hong Kong, we ensure timely and reliable delivery to support your project timelines.
Choosing Shanghai Zhibang Valve means partnering with a manufacturer that has built a solid reputation since 2016, supported by a systematic ISO9001 quality management framework. Our products have been successfully integrated into systems across diverse global markets, from North America and Western Europe to Southeast Asia and Africa, demonstrating their adaptability and reliability. This valve represents not just a component, but a commitment to operational efficiency and safety. For a reliable, high-performance flow control solution that meets international standards and is backed by proven manufacturing expertise, contact us today to discuss your specific requirements, request a detailed quotation, or explore customization options.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a double eccentric design over a single eccentric or concentric butterfly valve?
A: The primary advantage is significantly reduced operating torque and minimal wear. In a double eccentric valve, the disc completely disengages from the seat during 90% of its rotation, contacting it only at the point of closure. This eliminates constant friction, leading to easier operation, a tighter seal, and a much longer seat life.
Q2: For which valve sizes is a gear operator typically recommended?
A: While it can be used on smaller valves, a gear operator is highly recommended for valves DN200 (8") and larger. It provides the necessary mechanical advantage to overcome the high stem torque generated by system pressure on larger discs, making manual operation safe, smooth, and manageable for a single operator.
Q3: Can this valve be used for both on/off isolation and for flow throttling (modulation)?
A: Yes, absolutely. The double eccentric design, especially with a metal seat option, provides excellent flow characteristics suitable for precise throttling control. Its flow coefficient (Cv) curve is more linear compared to a standard butterfly valve, offering better controllability across its opening range.
Q4: What are the key differences between PTFE seats and metal seats?
A: PTFE (or reinforced PTFE) seats offer bubble-tight sealing (Class VI) at lower temperatures (typically up to 200°C) and are excellent for general service. Metal seats (stainless steel) are used for higher temperature applications (up to 425°C) and where the media may be abrasive or incompatible with polymers, though they typically correspond to a Class IV leakage rate.
Q5: Is this valve suitable for potable water applications?
A: With the appropriate material certifications (e.g., compliant with drinking water standards like WRAS, KTW, or NSF) for the body, disc, and seat materials, it can be configured for potable water. Please specify this requirement during inquiry so we can provide the correct material traceability and finish.
Q6: Can an actuator (pneumatic or electric) be fitted to this valve later?
A: Yes. The manual gear operator is designed with a standardized mounting interface (ISO 5211 pad). This allows for straightforward field retrofitting with a pneumatic or electric actuator at any time without modifying the valve body, offering great flexibility for future automation.
Q7: What is the typical delivery lead time for an order of these valves?
A: Lead time depends on the order quantity, size, and material specifications. Standard configurations in common sizes often have shorter lead times. We maintain efficient production planning to meet project schedules and can provide a specific timeline upon receipt of your detailed inquiry.
Q8: Do you provide technical support and documentation with the valves?
A> Yes. Each valve shipment is accompanied by essential documentation, which may include a material test certificate, pressure test report, installation and maintenance manual, and a packing list. Our technical team is also available to provide support for installation, operation, or troubleshooting queries.
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