The structural feature of the single eccentric butterfly valve is that the valve stem axis deviates from the center of the butterfly plate, so that the upper and lower centers of the butterfly plate no longer become the axis of rotation, dispersing and reducing excessive extrusion between the upper and lower ends of the butterfly plate and the cold night.
- Standards Compliance
Design standard: API 609,ASME B16.34
Structural length: ASME B16.10,GB/T 12221
Connecting end: ASME B16.5,ASME B16.47,ASME B16.25,GB/T 9113
Test standard: API 598,ISO 5208,GB/T 26480,GB/T 13927
| Actuation | Electric actuator, Pneumatic or hydraulic actuator, gear-box, ISO top-flange; |
| Connection | flanged, welded, wafer type; |
| DN: | 200, 250, 300, 350, 400, 500, 600, 700, 800, 1000, 1200, 1400, 1600, 2000; |
| PN: | 2,5, 6, 10, 16, 25 ; |
| Seal Material | NBR, (VITON, EPDM); |
| Tmax | 180 °C ; |
| Valve Type | L32.6; |
- Eccentric Butterfly Valves
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The main reason for the failure of the sealing performance of the sealing pair
① During the opening and closing process of the butterfly valve, when the valve plate rotates and squeezes the elastic soft valve seat, mechanical wear and scratches will occur on the valve plate and valve seat;② After the valve plate squeezes the elastic valve seat, the elastic valve seat or the elastic layer of the valve plate will produce permanent plastic deformation, cold flow, elastic failure, etc.;
③The material of the elastic valve seat or the elastic layer of the valve plate ages and fails;
④Medium cavitation and erosion of the sealing surface.
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