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力士樂電磁閥
有常閉型和常開型二種。常閉型斷電時呈關閉狀態，當線圈通電時產生電磁力，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位，直接關閉閥口，介質不通。結構簡單，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，電磁線圈產生電磁吸力把閥芯提起，使關閉件離遠開閥座密封副打開；斷電時，電磁力消失，靠彈簧力把關閉元件壓在閥座上閥門關閉。（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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