描述:美國(guó)NUMATICS電磁先導(dǎo)閥4.接管口徑:1/8NPTF或G牙;10-32UNF或M55.可于潤(rùn)滑或無(wú)潤(rùn)滑系統(tǒng)中使用6.可搭配迭加式減壓閥和速度控制模塊7.可提供手動(dòng)閥
美國(guó)NUMATICS電磁先導(dǎo)閥
閥芯閥套結(jié)構(gòu)特征
閥芯、閥套都用440c不銹鋼制成,經(jīng)精密加工,達(dá)到高精度配合公差,間隙僅1μm。由于是配對(duì)研磨拋光組件,故它們沒(méi)有互換性,必須成套供應(yīng)。當(dāng)氣流經(jīng)閥套上小孔進(jìn)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(dòng)對(duì)中。當(dāng)閥芯在這種空氣軸承上運(yùn)動(dòng)時(shí),像懸浮在空氣分子場(chǎng)中一樣,*沒(méi)有金屬間的接觸。這種空氣懸浮結(jié)構(gòu)帶來(lái)了如下好處:
美國(guó)NUMATICS電磁先導(dǎo)閥
(1)芯套間的精密配合形成密封。*摒棄了蘊(yùn)含許多故障因素的“○"形圈動(dòng)態(tài)密封。
(2)這是一種理論上無(wú)磨損的長(zhǎng)壽命結(jié)構(gòu)。
(3)空氣軸承允許閥工作在經(jīng)一定過(guò)濾得*無(wú)潤(rùn)滑場(chǎng)合。與其它號(hào)稱無(wú)油潤(rùn)滑元件相比(實(shí)際上裝配時(shí)已涂上一層不易揮發(fā)的潤(rùn)滑脂),這是一種真正意義上的無(wú)油潤(rùn)滑。
(4)移動(dòng)閥芯啟動(dòng)力極小且操作力恒定,這是制造高質(zhì)量直動(dòng)閥的要條件。它可不依賴先導(dǎo)壓力使直動(dòng)閥工作在真空到21bar(甚35bar)場(chǎng)合。
(5)芯套相同材質(zhì),熱膨脹系數(shù)*一樣,在高溫下也能確??諝廨S承的存在。
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