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Home > Industrial Equipment & Components > Valve > Butterfly Valve > API 609 Double Eccentric Butterfly Valve for Marine and Offshore Pipeline Isolation

API 609 Double Eccentric Butterfly Valve for Marine and Offshore Pipeline Isolation

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API 609 Double Eccentric Butterfly Valve for Marine and Offshore Pipeline Isolation photo-5

Product Spotlights

API 609 compliant double eccentric butterfly valve engineered for reliable isolation in harsh marine/offshore environments. Features offset disc design for low torque, long life, and bubble-tight sealing. Constructed from corrosion-resistant materials like stainless/duplex steel. Offers versatile actuation (manual/auto) and end connections. Reduces maintenance costs and downtime, backed by ISO9001 manufacturing and global export experience.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Standard:

API 609

Application:

Other, Marine and Offshore Pipeline Isolation

Design:

Double Eccentric (Offset Disc)

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Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Standard API 609

Application Other, Marine and Offshore Pipeline Isolation

Design Double Eccentric (Offset Disc)

Body Material Carbon Steel, Stainless Steel, Duplex Steel

Seat Material Metal Seat (e.g., 304/316 SS), PTFE

Disc Material Carbon Steel, Stainless Steel, Duplex Steel

Pressure Rating ASME Class 150, Class 300

Size Range 2 inch to 48 inch (DN50 to DN1200)

Operation Lever, Gearbox, Electric Actuator, Pneumatic Actuator

End Connection Wafer, Lug, Double Flanged

As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering high-performance fluid control solutions for demanding global industries. Established in 2016, we have built a solid reputation by exporting our products across continents, including North America, Southeast Asia, Europe, and the Middle East. Our API 609 Double Eccentric Butterfly Valve is engineered specifically for the rigorous isolation requirements of marine and offshore pipelines. This valve offers superior sealing reliability, extended service life, and robust construction, making it a trusted component for critical applications where failure is not an option.

The core value of this valve lies in its ability to provide a bubble-tight seal under high-pressure and corrosive conditions typical of offshore environments. Its double eccentric design minimizes wear on the seat and disc, ensuring consistent performance over thousands of cycles. We understand that marine and offshore operations demand equipment that can withstand harsh seawater, variable temperatures, and high vibration. Our valve is built to meet these challenges head-on, offering operators peace of mind and reduced total cost of ownership through lower maintenance needs and enhanced durability.

Key Features and Technical Advantages:

Double Eccentric (Offset) Design: The disc axis is offset from both the pipe centerline and the seat centerline. This unique geometry ensures that the disc only contacts the seat during the final few degrees of closure, drastically reducing friction, seat wear, and torque requirements. This leads to smoother operation and a significantly longer service life compared to concentric butterfly valves.
API 609 Compliance: Manufactured in accordance with API Standard 609 for butterfly valves, this product meets stringent industry requirements for design, materials, testing, and performance. This compliance is a hallmark of quality and reliability for oil, gas, and marine applications.
Robust Construction for Marine & Offshore Use: Available in a range of corrosion-resistant materials such as carbon steel with protective coatings, 316 stainless steel, and duplex steels. These materials are selected to combat the corrosive effects of seawater, chlorides, and other harsh chemicals found in offshore environments.
Superior Sealing Performance: Equipped with a metal seat (e.g., stainless steel) or a resilient seat (e.g., PTFE) option. The metal-to-metal or metal-to-resilient sealing interface provides excellent shut-off capabilities, suitable for isolation duties in pipelines carrying crude oil, seawater, chemicals, or other process fluids.
Versatile Actuation Options: Can be fitted with manual levers, gear operators, electric actuators, or pneumatic actuators. This flexibility allows for integration into automated control systems or manual operations as required by the specific platform or vessel layout.
Low Maintenance Design: The eccentric design and high-quality materials reduce the frequency of maintenance interventions. The stem is sealed effectively to prevent external leakage, and the seat design allows for potential in-line maintenance in some configurations.

Technical Specifications Table:

Parameter	Specification / Options
Design Standard	API 609
Pressure Rating	ASME Class 150, Class 300 (Higher ratings available upon request)
Size Range	2" to 48" (DN50 to DN1200)
Body Material	WCB, CF8, CF8M, Duplex 2205, Other alloys customizable
Disc Material	WCB, 304 SS, 316 SS, Duplex Steel, Nickel-Aluminum Bronze
Seat Material	Stainless Steel (Metal Seat), PTFE, Reinforced PTFE, Other resilient materials
End Connection	Wafer, Lug, Double Flanged (RF, RTJ face)
Operation	Lever, Worm Gear, Electric Actuator, Pneumatic Actuator (Optional)
Temperature Range	-29°C to +200°C (for PTFE seat), Higher for metal seats
Leakage Class	API 609 (Fire-safe design optional)

Benefits for Your Operation:

Enhanced Safety & Reliability: Provides dependable isolation, crucial for emergency shutdowns and routine maintenance on offshore platforms and ships, protecting personnel and assets.
Cost-Effective Lifecycle: The extended service life and reduced maintenance translate into lower operational costs and less downtime over the valve's lifespan.
Operational Flexibility: Suitable for a wide range of media including seawater, crude oil, fuel, and various process chemicals, making it a versatile choice for multiple pipeline systems.
Global Supply Chain Support: With annual export values between US$1-1.5 million and major shipment ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely and efficient delivery to your project site, wherever it is located.

Shanghai Zhibang's commitment to quality is underpinned by our ISO9001 certification, ensuring every valve undergoes rigorous production and testing controls. Our extensive market reach, spanning from Eastern Europe and Africa to Oceania and the Americas, is a testament to the global trust in our products. When you choose our API 609 Double Eccentric Butterfly Valve, you are not just purchasing a component; you are investing in a solution backed by manufacturing expertise, international compliance, and a proven track record of serving the demanding marine and offshore sector. Contact us today to discuss how this valve can enhance the safety and efficiency of your pipeline isolation systems.

Frequently Asked Questions (FAQ)

Q: What is the main advantage of a double eccentric design over a standard concentric butterfly valve?
A: The double eccentric (or double offset) design significantly reduces wear and friction between the disc and seat. The disc only contacts the seat at the final point of closure, leading to lower operating torque, a longer service life for the sealing components, and improved sealing performance, especially in high-pressure applications.
Q: Is this valve suitable for seawater service?
A: Yes, it is specifically designed for marine and offshore applications. We offer material combinations highly resistant to seawater corrosion, such as 316 stainless steel, duplex stainless steel, or carbon steel with specialized protective coatings. The selection depends on the specific service conditions.
Q: Can this valve be automated?
A: Absolutely. The valve is designed to be compatible with various actuators. We can supply it as a manual unit (lever or gear) or pre-fitted with electric or pneumatic actuators to suit your control system requirements. Actuator specifications can be customized upon request.
Q: What does compliance with API 609 mean for the end-user?
A: API 609 is a recognized standard for butterfly valves in the petroleum and natural gas industries. Compliance ensures the valve meets specific criteria for design, material strength, pressure-temperature ratings, and testing. It provides assurance of quality, reliability, and fitness for purpose in critical services.
Q: What are the available end connection types?
A: We offer wafer, lug, and double flanged end connections. The wafer type is compact and is sandwiched between pipe flanges. The lug type has threaded inserts allowing it to be installed at the end of a pipeline. Double flanged types have flanges on both ends for bolting directly to pipeline flanges.
Q: Do you offer fire-safe versions of this valve?
A: Fire-safe design is an optional feature. Valves can be manufactured and tested to meet relevant fire-safe standards (like API 607/API 6FA), where the valve maintains a seal even under intense heat, which is a critical safety feature for offshore oil and gas applications.
Q: What is the typical delivery lead time for an order?
A: Lead times vary based on order size, material specifications, and actuation requirements. Standard configurations typically have shorter lead times. We provide reliable schedules and ship efficiently from our main ports in Shanghai, Guangzhou, Hong Kong, and Beijing to ensure timely delivery.
Q: Can you provide technical support and documentation?
A: Yes, as a manufacturer, we provide comprehensive technical support, including datasheets, 2D/3D drawings, installation manuals, and material certificates. Our engineering team is available to assist with selection and application questions.