力士樂電磁閥
有常閉型和常開型二種。常閉型斷電時呈關(guān)閉狀態(tài)，當線圈通電時產(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；當線圈斷電時電磁力消失，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，電磁線圈產(chǎn)生電磁吸力把閥芯提起，使關(guān)閉件離遠開閥座密封副打開；斷電時，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：在真空、負壓、零壓時能正常工作，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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