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德國FESTO費斯托電磁閥
費斯托FESTO電磁閥的主要特點
（1）外漏堵絕，內(nèi)漏易控，使用安全。內(nèi)外泄漏是危及安全的要素。其它自控閥通常將閥桿伸出，由電動、氣動、液動執(zhí)行機構控制閥芯的轉(zhuǎn)動或移動。這都要解決長期動作閥桿動密封的外泄漏難題；唯有電磁閥是用電磁力作用于密封在電動調(diào)節(jié)閥隔磁套管內(nèi)的鐵芯完成，不存在動密封，所以外漏易堵絕。電動閥力矩控制不易，容易產(chǎn)生內(nèi)漏，甚至拉斷閥桿頭部；電磁閥的結構型式容易控制內(nèi)泄漏，直至降為零。所以，電磁閥使用特別安全，尤其適用于腐蝕性、有毒或高低溫的介質(zhì)。
（2）系統(tǒng)簡單，便接電腦，價格低謙。電磁閥本身結構簡單，價格也低，比起調(diào)節(jié)閥等其它種類執(zhí)行器易于安裝維護。更顯著的是所組成的自控系統(tǒng)簡單得多，價格要低得多。由于電磁閥是開關信號控制，與工控計算機連接十分方便。在當今電腦普及，價格大幅下降的時代，電磁閥的優(yōu)勢就更加明顯
電磁閥的菜單示它的電-氣轉(zhuǎn)換復雜性。閥的功能由兩個數(shù)字表示：M和N，稱為M路N位電磁閥，“N位”表示換向閥的切換位置，也表示閥的狀態(tài)。閥的位置數(shù)目就是N的數(shù)值，如二位閥有兩個位置選擇亦即有兩種狀態(tài)，三位閥則有三個位置選擇亦即有三種不同的狀態(tài)。“M路”表示閥對外接口的通路，包括進氣口，出氣口和排氣口，通路的數(shù)目便是M的數(shù)值，如二路閥，三路閥等。圖4.1a例子中的閥為3/2直動式電磁閥，念作“三路二位閥”，表示該閥有兩個位，即“通”和“斷”兩個狀態(tài)，有三個氣口，分別為1：進氣口，2：出氣口，3：排氣口
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德國FESTO費斯托電磁閥
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