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力士樂電磁閥
有常閉型和常開型二種。常閉型斷電時(shí)呈關(guān)閉狀態(tài),，當(dāng)線圈通電時(shí)產(chǎn)生電磁力,，使動鐵芯克服彈簧力同靜鐵芯吸合直接開啟閥，介質(zhì)呈通路,；當(dāng)線圈斷電時(shí)電磁力消失,，動鐵芯在彈簧力的作用下復(fù)位，直接關(guān)閉閥口,，介質(zhì)不通,。結(jié)構(gòu)簡單，動作可靠,，在零壓差和微真空下正常工作,。常開型正好相反。如小于φ6流量通徑的電磁閥,。
原理：常閉型直動式電磁閥通電時(shí),，電磁線圈產(chǎn)生電磁吸力把閥芯提起，使關(guān)閉件離遠(yuǎn)開閥座密封副打開,；斷電時(shí),，電磁力消失，靠彈簧力把關(guān)閉元件壓在閥座上閥門關(guān)閉。（常開型與此相反）特點(diǎn)：在真空,、負(fù)壓,、零壓時(shí)能正常工作，但一般通徑不超過25mm,。DN50以下可任意安裝,，但電磁頭體積較大。

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