美國NUMATICS電磁先導閥
閥芯閥套結構特征
閥芯、閥套都用440c不銹鋼制成,經精密加工,達到高精度配合公差,間隙僅1μm。由于是配對研磨拋光組件,故它們沒有互換性,必須成套供應。當氣流經閥套上小孔進入,在閥芯、閥套間微小間隙中形成一空氣薄膜,閥芯在閥套中自動對中。當閥芯在這種空氣軸承上運動時,像懸浮在空氣分子場中一樣,*沒有金屬間的接觸。這種空氣懸浮結構帶來了如下好處:
美國NUMATICS電磁先導閥
(1)芯套間的精密配合形成密封。*摒棄了蘊含許多故障因素的“○"形圈動態密封。
(2)這是一種理論上無磨損的長壽命結構。
(3)空氣軸承允許閥工作在經一定過濾得*無潤滑場合。與其它號稱無油潤滑元件相比(實際上裝配時已涂上一層不易揮發的潤滑脂),這是一種真正意義上的無油潤滑。
(4)移動閥芯啟動力極小且操作力恒定,這是制造高質量直動閥的要條件。它可不依賴先導壓力使直動閥工作在真空到21bar(甚35bar)場合。
(5)芯套相同材質,熱膨脹系數*一樣,在高溫下也能確保空氣軸承的存在。
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