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China Suppliers Factory Double Eccentric Butterfly Valve PN16 Soft Sealing D342X DN200-DN3000
Valve Type: |
Eccentric butterfly valve |
Structure: |
Eccentric |
Standard: |
EN593 |
Workmanship: |
Investment casting |
Sealing direction: |
Bidirectional |
Sealing grade: |
Zero leakage |
Temperature: |
-20°C < T < 120°C |
Operation: |
Handle/Lever |
Characteristics
Featuring a double-eccentric structural design, the eccentric butterfly valve integrates shut-off, connection, and flow regulation functionalities, making it well-suited for meeting the versatile requirements of pipeline systems in urban water supply and drainage, building fire protection, metallurgical hydropower, and other industrial sectors. Its sealing surface is fabricated with stainless steel welding technology and paired with a dual-seal ring configuration, which not only resolves shaft hole leakage issues effectively but also enhances corrosion resistance. By leveraging flow field simulation and stress measurement technologies, the product's performance metrics meet or exceed national standard requirements.
Advantages
- 1 High pressure resistance and long service life: Compared to midline butterfly valves, double eccentric butterfly valves are more resistant to high pressure, have good stability, and have a longer service life.
- 2 Large flow rate: Reduced friction between the disc and seat significantly lowers component wear, extending the valve's service life by 30–50% compared to concentric butterfly valves. The simplified structure (fewer moving parts) facilitates easy disassembly, inspection, and replacement of wearing parts (seats, packing), minimizing downtime and maintenance costs.
- 3 Cost-Effective Large-Diameter Solutions: Compared to gate valves or globe valves of the same diameter, double eccentric butterfly valves offer a more compact structure, lighter weight, and lower manufacturing/installation costs. They require less space for piping layout and simpler actuator configurations (air, electric, hydraulic), reducing overall project investment—ideal for large-scale infrastructure (municipal water supply, power plants, chemical pipelines).
- 4 Good sealing performance: The eccentric structure of the butterfly plate is combined with the valve seat to form a built-in sealing structure, which can effectively avoid air leakage, water leakage and other situations.
- 5 Simple structure: Composed of a small number of components, easy to maintain and repair.
Packing
Standard export wooden case packaging
Application Scenarios
The double eccentric butterfly valves has broad range of low-to-medium pressure applications (PN1.0–PN1.6MPa), double eccentric butterfly valves excel in handling room-temperature clean water, cooling water, and circulating water systems. They are also widely deployed in municipal water supply infrastructure, building piping networks, and fire protection systems, delivering reliable performance across diverse commercial and industrial scenarios.
Frequently Asked Questions
Q
What is a double eccentric butterfly valve and how does it differ from a concentric butterfly valve?
A double eccentric butterfly valve features two offset axes—one offset from the centerline of the pipe bore and one from the sealing surface—allowing the disc to lift away from the seat upon opening. This design eliminates continuous friction between the disc and seat during operation, unlike a concentric butterfly valve where the disc stays in constant contact with the seat. The result is significantly lower wear, better sealing performance, and a longer service life.
Q
What pressure and temperature ranges are suitable for this eccentric butterfly valve?
This double eccentric butterfly valve is designed for low-to-medium pressure applications ranging from PN1.0 to PN1.6 MPa. It operates reliably within a temperature range of -20°C to 120°C, making it suitable for clean water, cooling water, and general industrial fluid systems.
Q
What industries or applications is this valve most suitable for?
The double eccentric butterfly valve is widely used in municipal water supply and drainage systems, building fire protection systems, HVAC cooling water circuits, metallurgical and hydropower industries, and general industrial pipelines. It is especially cost-effective for large-diameter pipeline projects such as power plants and chemical processing facilities.
Q
How is the sealing performance achieved and what is the leakage standard?
The valve achieves zero leakage through a combination of its eccentric disc structure and a dual-seal ring configuration. The sealing surface is fabricated using stainless steel welding technology, which effectively eliminates shaft hole leakage and enhances corrosion resistance. The built-in sealing structure prevents air leakage and water leakage under normal operating conditions.
Q
What are the maintenance requirements for a double eccentric butterfly valve?
Due to its simple structure with fewer moving parts, the double eccentric butterfly valve is easy to maintain. Wearing parts such as seats and packing can be easily disassembled, inspected, and replaced without requiring specialized tools or extended downtime. Regular inspection of the sealing surfaces and actuator is recommended to ensure long-term performance.
Q
What standard does this valve comply with, and what is the manufacturing process?
This eccentric butterfly valve is manufactured in compliance with the EN593 standard. It is produced using investment casting workmanship, which ensures dimensional accuracy, consistent material quality, and superior surface finish. Performance metrics are verified through flow field simulation and stress measurement technologies to meet or exceed national standard requirements.