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1、電磁閥從原理(li)上分為三大類：

高溫直動式電磁閥

電磁閥直動式電磁閥

原理：通電(dian)時(shi)，電(dian)磁(ci)線圈產生電(dian)磁(ci)力把關(guan)(guan)閉件(jian)從閥(fa)座上提起，閥(fa)門打開；斷(duan)電(dian)時(shi)，電(dian)磁(ci)力消失(shi)，彈簧(huang)把關(guan)(guan)閉件(jian)壓在(zai)閥(fa)座上，閥(fa)門關(guan)(guan)閉。

高溫直動式電磁閥

特點：在真空、負(fu)壓、零壓時能正常(chang)工作(zuo)，但(dan)通徑一般不(bu)超過25mm。

電磁閥分步直動式電磁閥

原理(li)：它是一(yi)種直(zhi)動(dong)和先(xian)導(dao)式相結(jie)合的原理(li)，當入(ru)口與(yu)出口沒有壓(ya)差(cha)時(shi)(shi)，通(tong)電(dian)(dian)(dian)后，電(dian)(dian)(dian)磁(ci)力直(zhi)接把先(xian)導(dao)小(xiao)閥和主(zhu)閥關(guan)閉(bi)件(jian)依次向(xiang)上(shang)提(ti)起，閥門打開(kai)。當入(ru)口與(yu)出口達到啟動(dong)壓(ya)差(cha)時(shi)(shi)，通(tong)電(dian)(dian)(dian)后，電(dian)(dian)(dian)磁(ci)力先(xian)導(dao)小(xiao)閥，主(zhu)閥下腔壓(ya)力上(shang)升，上(shang)腔壓(ya)力下降，從而(er)利(li)用壓(ya)差(cha)把主(zhu)閥向(xiang)上(shang)推開(kai)；斷(duan)電(dian)(dian)(dian)時(shi)(shi)，先(xian)導(dao)閥利(li)用彈簧力或介質壓(ya)力推動(dong)關(guan)閉(bi)件(jian)，向(xiang)下移動(dong)，使閥門關(guan)閉(bi)。

特點：在零壓(ya)(ya)差或真空、高(gao)壓(ya)(ya)時(shi)亦能可*動(dong)作，但功率較大，要(yao)求必須水平安裝。電(dian)磁閥先(xian)導(dao)式電(dian)磁閥

原理：通(tong)電時(shi)，電磁力(li)把(ba)先導(dao)孔打(da)開，上(shang)(shang)腔室壓(ya)(ya)力(li)迅速下(xia)降，在關 閉(bi)件周圍(wei)形(xing)(xing)成上(shang)(shang)低下(xia)高(gao)的壓(ya)(ya)差，流(liu)體壓(ya)(ya)力(li)推動(dong)關閉(bi)件向上(shang)(shang)移(yi)動(dong)，閥門打(da)開；斷電時(shi)，彈(dan)簧力(li)把(ba)先導(dao)孔關閉(bi)，入口壓(ya)(ya)力(li)通(tong)過旁通(tong)孔迅速腔室在關閥件周圍(wei)形(xing)(xing)成下(xia)低上(shang)(shang)高(gao)的壓(ya)(ya)差，流(liu)體壓(ya)(ya)力(li)推動(dong)關閉(bi)件向下(xia)移(yi)動(dong)，關閉(bi)閥門。

特(te)點：流(liu)體(ti)壓(ya)(ya)力范圍上(shang)限較(jiao)高(gao)，可(ke)任意安裝（需定制(zhi)）但必須滿足流(liu)體(ti)壓(ya)(ya)差條件。

2、電(dian)磁閥(fa)從閥(fa)結構(gou)(gou)和材料(liao)上的不同與原理上的區別，分(fen)(fen)為(wei)六個分(fen)(fen)支小類：直動(dong)膜(mo)(mo)片(pian)結構(gou)(gou)、分(fen)(fen)步直動(dong)膜(mo)(mo)片(pian)結構(gou)(gou)、先(xian)導膜(mo)(mo)片(pian)結構(gou)(gou)、直動(dong)活塞結構(gou)(gou)、分(fen)(fen)步直動(dong)活塞結構(gou)(gou)、先(xian)導活塞結構(gou)(gou)。

3、電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)按(an)照功能分類(lei)：水用(yong)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、蒸汽電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、制(zhi)冷(leng)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、低溫電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、燃(ran)氣電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、消防(fang)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、氨用(yong)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、氣體(ti)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、液體(ti)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、微型(xing)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、脈(mo)沖電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、液壓電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa) 常開電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、油用(yong)電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、直(zhi)流電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、高壓電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)、防(fang)爆電(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)(ci)閥(fa)(fa)(fa)(fa)等。