美国NUMATICS电磁先导阀
阀芯阀套结构特征
阀芯、阀套都用440c不锈钢制成,经精密加工,达到高精度配合公差,间隙仅1μm。由于是配对研磨抛光组件,故它们没有互换性,必须成套供应。当气流经阀套上小孔进入,在阀芯、阀套间微小间隙中形成一空气薄膜,阀芯在阀套中自动对中。当阀芯在这种空气轴承上运动时,像悬浮在空气分子场中一样,*没有金属间的接触。这种空气悬浮结构带来了如下好处:
美国NUMATICS电磁先导阀
(1)芯套间的精密配合形成密封。*摒弃了蕴含许多故障因素的“○"形圈动态密封。
(2)这是一种理论上无磨损的长寿命结构。
(3)空气轴承允许阀工作在经一定过滤得*无润滑场合。与其它号称无油润滑元件相比(实际上装配时已涂上一层不易挥发的润滑脂),这是一种真正意义上的无油润滑。
(4)移动阀芯启动力极小且操作力恒定,这是制造高质量直动阀的要条件。它可不依赖先导压力使直动阀工作在真空到21bar(甚35bar)场合。
(5)芯套相同材质,热膨胀系数*一样,在高温下也能确保空气轴承的存在。
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