下載威格士VICKERS換向閥的技術文章
VICKERS電磁換向閥出來的先導油控制主換向閥閥芯的移動，使工作泵的來油進入動臂油缸實現動臂上升。比例先導減壓閥的輸出壓力越大，控制主換向閥閥芯的位移越大，主換向閥通過的流量越大，動臂上升的速度越快。當操作手柄拉限位置時，手柄中的限位電磁鐵通電，手柄在極限位置被吸合。動臂以zui大的速度上升，當升至動臂上位限位開關所限定的位置時，操作手柄限位電磁鐵斷電，手柄自動恢復到中位，動臂就可保持在所限定的位置。在動臂上升的過程中，若需要動臂在某一位置停留，則需將操作手柄退回中位。
VICKERS電磁換向閥主要用在電氣液壓伺服系統中作為執行元件(見液壓伺服系統)。在伺服系統中，液壓執行機構同電氣及氣動執行機構相比，具有快速性好、單位重量輸出功率大、傳動平穩、抗*力強等特點。另一方面，在伺服系統中傳遞信號和校正特性時多用電氣元件。因此，現代高性能的伺服系統也都采用電液方式，伺服閥就是這種系統的必需元件。
美國VICKERS威格士比例換向閥*型號
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