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Help CenterAPI 609 Double Eccentric Butterfly Valve DN800 With Gearbox for High Pressure Systems
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As a leading manufacturer with a strong commitment to quality since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our API 609 Double Eccentric Butterfly Valve DN800 with Gearbox. Engineered specifically for demanding high-pressure applications, this valve represents the culmination of precision manufacturing and adherence to the stringent API 609 standard. Our extensive experience in exporting to global markets, including North America, Europe, and Southeast Asia, ensures we understand the critical requirements for reliability and performance in industrial fluid control. This DN800 valve is designed to provide a robust, long-lasting sealing solution where pressure integrity is paramount, offering superior value through reduced maintenance and extended service life.
The double eccentric (double-offset) design is the core technological advantage of this butterfly valve. This geometry minimizes wear and friction during operation, which is crucial for high-cycle applications.
- First Offset (Shaft Offset): The valve shaft is positioned behind the centerline of the disc seat. This allows the disc to lift away from the seat immediately upon opening, eliminating sliding contact and drastically reducing seat wear.
- Second Offset (Axis Offset): The axis of the disc is offset from the centerline of the pipe bore. This creates a cam-like action during the final degrees of closure, ensuring a tight, uniform compression seal against the seat.
This valve is equipped with a gearbox actuator, which provides significant mechanical advantage for easy operation under high differential pressures. The gearbox allows for precise throttling control and reduces the required handwheel force, making it suitable for large-diameter, high-pressure lines where direct lever operation would be impractical or unsafe.
Key Technical Specifications & Advantages:
| Feature | Specification / Benefit |
|---|---|
| Design & Standard | Conforms to API 609 for butterfly valves. This ensures design, materials, testing, and inspection meet high industry standards for refinery and related services. |
| Size & Pressure | Nominal Diameter: DN800 (800mm). Engineered for high-pressure systems, typically rated for ANSI Class 150 or 300, with options for higher classes. |
| Body & Disc Material | Standard construction uses carbon steel (WCB) for the body and stainless steel (e.g., 316, 410) for the disc. Other materials like duplex stainless steel are available for corrosive services. |
| Seat Options |
|
| Gearbox Ratio | High ratio gearbox provides high torque output, enabling manual operation against high line pressure. Often includes a visual position indicator. |
| Leakage Rate | Designed to achieve low leakage rates, often meeting or exceeding standards like API 598 for tight shut-off in critical services. |
Benefits for Your Operation:
- Enhanced Durability & Lifecycle: The double eccentric design dramatically reduces seat wear, leading to a much longer maintenance interval and lower total cost of ownership.
- Reliable High-Pressure Sealing: The cam-action closure ensures a consistent, reliable seal even after thousands of cycles under high pressure, minimizing the risk of fugitive emissions or process leaks.
- Operational Safety & Ease: The integrated gearbox makes opening and closing a large DN800 valve under pressure safe and manageable for plant personnel, reducing operational risk.
- Versatile Application: Suitable for a wide range of media in high-pressure systems, including water, steam, oil, gas, and certain chemicals, across industries like oil & gas, power generation, and chemical processing.
- Reduced Torque & Operating Costs: Lower operating torque translates to potential savings on actuation systems (if automated later) and reduces strain on valve components.
Frequently Asked Questions (FAQ):
Q1: What is the main difference between a double eccentric and a single eccentric butterfly valve?
A1: A single eccentric (offset) valve has only the shaft offset from the seat centerline. A double eccentric valve adds a second offset—the disc axis is also offset from the pipe centerline. This double-offset design further reduces wear and improves sealing performance, especially in high-pressure or high-cycle applications, making it more durable and reliable.
Q2: Can this API 609 valve be used for both isolation and throttling service?
A2: Yes, the double eccentric design with a gearbox is well-suited for both on/off isolation and precise flow modulation (throttling). The gearbox allows for fine control of the disc position, enabling stable flow regulation across its operating range.
Q3: What pressure class (e.g., ANSI 150) is this DN800 valve typically supplied in?
A3> While customizable, our standard offering for high-pressure systems often includes ANSI Class 150 and Class 300 ratings. The specific pressure rating for your order will be confirmed based on your application's design pressure and temperature requirements.
Q4: Is the gearbox standard, and can the valve be automated in the future?
A4: Yes, a manual gearbox operator is the standard configuration for this valve size and pressure rating. The design is fully compatible with later automation. The gearbox can typically be replaced with a pneumatic, hydraulic, or electric actuator mounting kit without modifying the valve body, offering flexibility for future plant upgrades.
Q5: Does it come with a fire-safe design?
A5> Fire-safe capability is a key feature, especially when equipped with a metal seat. In the event of a fire, the metal-to-metal contact between the disc and seat can maintain a seal even if the primary resilient seat (if present) is damaged. Compliance with specific fire-safe standards (like API 607/API 6FA) can be provided upon request.
Q6: What are the common seat materials, and how do I choose?
A6> Common options include:
- PTFE/RPTFE: For excellent chemical resistance and bubble-tight shutoff at lower temperatures.
- PEEK: For higher temperature and better wear resistance than PTFE.
- Stainless Steel / Metal: For very high temperatures, abrasive media, or where fire-safe design is critical. Selection depends on your process media, temperature, and pressure.
Q7: What testing is performed before shipment?
A7> As a manufacturer adhering to ISO9001 quality management, each valve undergoes rigorous testing. This typically includes a hydrostatic shell test (to 1.5x rated pressure), a seat leakage test (per API 598 or specified standard), and operational tests of the gearbox. Certified test reports are available.
Q8: What is the lead time for a DN800 valve of this type?
A8> Lead times vary based on material specifications, seat type, and order quantity. For a standard configuration, please contact us directly for the most accurate current production schedule. We ship globally from major ports like Shanghai, Guangzhou, and Hong Kong.
Backed by our ISO9001 certification and nearly a decade of manufacturing expertise since 2016, Shanghai Zhibang Valve delivers products that meet rigorous international standards. Our annual export value of US$1-1.5 Million to diverse markets across North America, Europe, Asia, and Africa is a testament to the global trust in our valve solutions. When you choose our API 609 Double Eccentric Butterfly Valve, you are not just purchasing a component; you are investing in enhanced system reliability, operational safety, and long-term cost savings for your high-pressure applications. We encourage you to contact us with your specific project requirements to receive a detailed quotation and technical support tailored to your needs.
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