Full
Outline
To address the issue that traditional plunger‑type melt three‑way directional valves cannot meet the process requirements for discharge switching at the outlet of the final polymerization reactor in nylon 66 continuous polymerization units，a novel self‑lift plug‑type melt three‑way directional valve has been developed.The structural principles of this final polymerization reactor outlet three‑way valve were analyzed，and calculations and verifications were performed for the valve body wall thickness，the thrust required by the actuator for sealing between the plug and valve seat，and the assembly interference required for sealing between the valve seat and valve body.This valve features outstanding performance characteristics such as compact structure，small overall dimensions，excellent melt flow adaptability，reliable sealing，and fast，flexible directional switching.The results show that with a unilateral assembly interference of 0.175 mm for the valve seat，the unilateral interference can reach 0.270 mm under design temperature，with an interface pressure of 75.70 MPa and a high‑viscosity melt sealing safety factor of 2.44.Industrial applications demonstrate that the structural design of the final polymerization reactor outlet three‑way directional valve is reasonable，its high‑temperature sealing performance meets the GB/T 13927—2022 Class A sealing requirements （no visible leakage），online switching is fast and smooth，and the mean time between failures （MTBF） is ≥12 months.This research provides a reference for the improved design of three‑way directional 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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