Full
Outline
In order to improve the sealing performance of hard‑sealed ball valve，we optimized the sealing surface according to the distribution of sealing pressure.Based on the Roth model，we calculated the leakage under uniform and U‑type sealing pressure distributions，found that there is less leakage in the uniform one.We regarded the average of sealing pressure in valid sealing zone and the proposed non‑dimensional number‑leakage index as two criteria of the sealing performance.On this basis，we separately analyzed the radius of the main sealing surface，R，and the radii of the chamfers，r1 and r2.In the context of this study，optimal sealing performance is achieved when R matches the radius of the ball，resulting in improvements of 32.2% and 65.0% in the two evaluation criteria compared to a flat sealing surface.The edge effect can be mitigated by limiting r1 and r2 within narrow ranges—specifically，r1=1.2~4.0 mm，and r2=0.5~2.0 mm.Beyond these ranges，a new edge effect emerges within the sealing area，leading to degraded performance.Considering both factors，the hard‑sealed ball valve exhibits peak sealing performance when R=72 mm，r1=1.2 mm，and r2=0.5 mm，with the two criteria improved by 38.5% and 66.4%，respectively.This research provides theoretical guidance for the structural design of sealing surfaces in hard‑sealed ball valves.
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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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