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Eccentric butterfly valve
Eccentric butterfly valve is mainly suitable for power, petroleum, food, medicine, chemical industry, textile, paper and other industries, as a regulation and closure equipment
Application
Eccentric butterfly valve according to the design structure is divided into eccentric, double eccentric, three eccentric structure, mainly suitable for power, oil, food, medicine, chemical, textile, paper and other industries, as a regulation and closure equipment. Compared with midline butterfly valves, eccentric butterfly valves are more resistant to high pressure, longer life and better stability.
Characteristic
• Single eccentric butterfly valve for the stem axis is deviated from the butterfly plate center, so that the upper and lower end of the butterfly plate no longer become the rotating axis, dispersion, reduce the butterfly plate upper and lower end and seat excessive extrusion.
• Dual eccentric butterfly valves feature a stem axis that deviates from both disc center and body center. The effect of double eccentricity makes the butterfly plate quickly break away from the seat after the valve is opened, which greatly eliminates the unnecessary excessive extrusion and scraping phenomenon between the butterfly plate and the seat, reduces the opening resistance, reduces wear and improves the life of the seat.
• Three eccentric butterfly valve increases the sealing surface of the eccentric, that is, the shape of the sealing pair is not a positive cone, but an oblique cone; Three eccentric butterfly valve to overcome the zero leakage, must use the soft seal problem, to achieve high temperature resistant hard seal butterfly valve.
• Body material, structure type, sealing surface material and packing can be reasonably selected according to the actual working conditions or user requirements, can be applied to a variety of pressure, temperature and medium working conditions;
• Multiple operation modes for users to choose, mainly manual, turbine drive, pneumatic, electric and so on.
Design Guides
| Design and manufacture | Structure length | Connector size | Inspection and test | Pressure and temperature reference |
| NB /T47044、 JB/T 8527、 GB/T 12238 |
GB/T 12221 | GB/T9124.1、JB/T79、GB/T 17241.6 | GB/T13927 | NB/T47044、 GB/T 12224、 GB/T 17241.1 |
Product Range
| Nominal pressure | PN16～PN100（Class150—Class600） | |
| Nominal size | DN50～DN2000（NPS 2～NPS 80） | |
| Body matenal | Casting：WCB、WC6、WC9、CF8、CF3 Forgings：20、A105、12Cr1MoV、304、316 |
|
| Test pressure(MPa) | Strength test (Water pressure) | 1.5×P(38℃ pressure rating) |
| Sealing test (Water pressure) | 1.1×P(38℃ pressure rating) | |
| Applicable Temperature | -29℃～575℃ | |
| Applicable medium | Water, steam, oil, air, gas, sewage, etc | |
Note：
1、The valve beyond the above specifications can be customized according to user requirements;
2、The applicable temperature range of each valve shall be subject to the actual pressure bearing material of the valve.