Full
Outline
To address the dynamic interference issue between the disc and seat during the opening/closing process of quadruple‑offset butterfly valves，precise mathematical modeling enables motion trajectory prediction and parameter optimization.Based on the eccentric structure，a three‑dimensional surface model of the sealing pair was established，deriving motion trajectory equations for any point on the disc.A dual interference detection method combining coordinate comparison and opening/closing angle inspection was proposed.Analysis of 200 cross‑sections of a DN300 valve's sealing pair shows：under initial parameters （first offset 31 mm），interference risks exist during operation；after optimization （first offset adjusted to 43 mm），the opening/closing angle deviation δ improves from initial negative values to zero interference risk on selected sections.This research provides precise theoretical guidance for designing and manufacturing quadruple‑offset butterfly valves，enhancing design efficiency and reliability.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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