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Help CenterAPI 609 Double Eccentric Butterfly Valve With 2-Year Warranty on Sealing Components
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As a professional manufacturer with a solid foundation since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd specializes in producing high-quality industrial valves for demanding applications. Our API 609 Double Eccentric Butterfly Valve represents our commitment to engineering excellence and reliability. Designed specifically for critical services in oil & gas, petrochemical, and power generation industries, this valve offers superior sealing performance, enhanced durability, and operational efficiency, backed by a confident 2-year warranty on its sealing components. We combine rigorous manufacturing processes under our ISO9001 certified system with a deep understanding of global market requirements, ensuring our products meet the high standards expected by our clients across North America, Europe, Asia, and beyond.
The double eccentric (double offset) design is the core feature that sets this butterfly valve apart from conventional models. This advanced geometry minimizes wear and ensures a tight seal throughout its service life.
- First Eccentricity (Axis Offset): The shaft axis is offset from the centerline of the disc and the seat. This allows the disc to completely disengage from the seat during the initial opening rotation, eliminating scraping friction and reducing wear dramatically.
- Second Eccentricity (Center Offset): The shaft axis is also offset from the centerline of the pipe. This creates a cam-like action during closure, where the disc seals against the seat with a gradual, compressive force rather than a abrasive sliding motion, ensuring a positive seal.
These dual eccentricities translate into significant advantages for end-users:
- Extended Seal Life: Reduced friction means the sealing components (disc edge and seat) last much longer, directly supporting our 2-year warranty promise.
- Lower Operating Torque: Easier opening and closing reduces the required actuator size and power consumption.
- Excellent Sealing Performance: Capable of achieving bubble-tight shut-off even under varying pressure and temperature conditions.
- High Cycle Reliability: Suitable for frequent operation applications without rapid performance degradation.
Our valves are manufactured to comply with the API 609 standard, which specifies requirements for butterfly valves in petroleum, petrochemical, and natural gas industries. This ensures dimensional interchangeability, material suitability, and performance criteria are met.
| Parameter | Specification / Range |
|---|---|
| Design Standard | API 609 |
| Size Range (Nominal Diameter) | DN50 (2") to DN600 (24") |
| Pressure Class | PN10/16/25/40 (Class 150, Class 300 typical) |
| End Connection | Flanged (RF, RTJ), dimensions per ASME B16.5/EN/ISO |
| Body Material | Cast Steel (WCB), Carbon Steel, Ductile Iron (optional) |
| Disc Material | Stainless Steel (304/316), Carbon Steel with coating |
| Seat Material | PTFE, Reinforced PTFE, Metal Seat (for high temp) |
| Temperature Range | Standard: -20°C to +150°C; High-Temp Option: up to +200°C |
| Operation Method | Manual (Lever, Gear), Electric Actuator, Pneumatic Actuator |
| Flow Characteristic | Approximately equal percentage |
The 2-Year Warranty on Sealing Components is a testament to our confidence in the product's design and manufacturing quality. This warranty covers the primary sealing interface (disc edge and seat ring) against premature failure under normal operating conditions, providing peace of mind and reducing long-term maintenance costs for our clients.
Shanghai Zhibang Valve has established itself as a reliable partner in the global valve market, exporting to over a dozen major regions including North America, South America, Europe, Southeast Asia, Africa, and the Middle East, with an annual export value consistently between US$1 Million and US$1.5 Million. Our products are shipped from major ports like Shanghai, Guangzhou, Hongkong, and Beijing, ensuring efficient logistics. Our ISO9001 certification underpins every stage of production, from material selection to final testing. Choosing our API 609 Double Eccentric Butterfly Valve means selecting a product built with precision, backed by a substantial warranty, and supported by a manufacturer with proven international reach and a commitment to quality. Contact us to discuss how this valve can enhance the reliability and efficiency of your fluid control systems.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a "double eccentric" design compared to a standard concentric butterfly valve?
A: The double eccentric design significantly reduces friction between the disc and seat during operation. This leads to longer seal life, lower operating torque, and more reliable bubble-tight shut-off, especially in higher pressure applications.
Q2: What does "API 609" compliance mean for this valve?
A: API 609 is a standard published by the American Petroleum Institute for butterfly valves used in hydrocarbon industries. Compliance ensures the valve meets specific requirements for design, materials, dimensions, pressure-temperature ratings, and testing, guaranteeing suitability for oil & gas, petrochemical, and similar critical services.
Q3: What exactly is covered under the "2-Year Warranty on Sealing Components"?
A: The warranty covers the primary sealing elements—the sealing edge of the disc and the seat ring—against failure that prevents the valve from achieving its specified shut-off function, provided the valve is used within its specified pressure, temperature, and media conditions.
Q4: Can this valve be used for steam service?
A: Yes, with the appropriate configuration. Standard models with PTFE seats are suitable for lower temperature steam. For higher temperature steam applications, a model with a metal seat (stainless steel or similar) and suitable body/disc materials can be provided. Please specify your temperature requirements.
Q5: What types of actuators are available?
A: We offer a range of actuation options to suit your control needs: manual operation via lever or gearbox, electric actuators (on/off or modulating), and pneumatic actuators (single or double acting). The valve design is compatible with many industry-standard actuator brands.
Q6: Is the valve suitable for corrosive fluids?
A: The valve can handle mildly corrosive fluids when configured with stainless steel (304 or 316) disc and appropriate body material. For highly corrosive media, specific material combinations (e.g., full stainless steel body) can be explored as a custom option.
Q7: How does the warranty process work if a seal issue arises?
A: In the event of a warranted seal failure, please contact us with the valve details and operating history. We will evaluate the case and typically provide replacement sealing components or, if necessary, arrange for repair services. Our goal is to ensure your system's continued operation.
Q8: What testing is performed on the valves before shipment?
A> Each valve undergoes routine inspection and testing per API 609 and our ISO9001 procedures. This includes visual inspection, dimensional checks, and hydrostatic shell and seat tests (where applicable) to verify pressure integrity and sealing performance.
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