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PRODUCTS / Eccentric Butterfly valves / Double Offset Butterfly valves
The Double Offset Butterfly Valve from Jeongdo Machinery—also known as a High-Performance Butterfly Valve—features a double-offset design, where the stem is offset from the disc center (1st offset) and the valve body centerline (2nd offset).
This structure enables reliable operation in high-temperature and high-pressure applications. Depending on fluid temperature, the valve is available with either RTFE seat or metal seat options. It is also manufactured in Wafer, Lugged, and Flanged types to suit various piping systems.
Through Jeongdo Machinery's patented technology, the restoring force of the seat is enhanced, improving sealing performance in the reverse direction. An integral stopper is applied to prevent excessive disc movement, thereby minimizing seat damage and extending product lifespan.
RTFE seat stands for Reinforced PTFE, which is a composite material made of PTFE (Polytetrafluoroethylene) mixed with glass fiber and molybdenum.
The valve design complies with API 609 standards, ensuring reliable performance and international compatibility in high-performance butterfly valve applications.
The valve body is tapped to allow Dead-End Service, enabling stable operation at the end of a pipeline without requiring downstream support.
Sealing Performance
Full flange-face contact ensures excellent leak prevention, with stable performance under vibration and pressure fluctuations.
Pressure & Size Compatibility
Suitable for high-pressure and large-diameter pipelines; robust structure allows use in medium to large-scale systems.
Seismic Resistance & Durability
Designed to withstand vibration, load, repeated operation, and external impacts.
Precision Installation
Easy flange alignment improves piping accuracy and enhances overall system reliability.
Standard Compatibility
Fully compatible with ANSI, JIS, KS and other international flange standards, ensuring easy replacement and system expansion.
Easy Maintenance
Can be disassembled per flange section, allowing for simple inspection and servicing.
| Design Standards | |
|---|---|
| Valve Design | API 609 Category B |
| ASME B16.34 | |
| MSS-SP 68 | |
| Flange Drilling | ASME B16.5, ASME B16.47 |
| Face to Face | API 609 |
| ISO 5752 |
| Specfication | |
|---|---|
| Body Type | Wafer / Lugged / Flanged |
| Size | 1 1/4 " ~ 64" |
| Flange Connection | ASME 150 / 300 |
| PN 10/16/25/40 | |
| Temperature Range | RTFE (-29℃~200℃) |
| Stainless Steel (-29℃~350℃) |
| Material Option | |
|---|---|
| Body | Ductile Iron |
| A216-WCB | |
| A351-CF8 / CF8M / CF3M | |
| DISC | A351-CF8 / CF8M |
| Monel, Duplex | |
| Stem | SS420 |
| SS630 (17-4PH) | |
| Seat | RTFE |
| Stainless steel |
