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直動式(shi)電磁(ci)閥:
原理:通(tong)電(dian)時(shi),電(dian)磁(ci)線圈產生電(dian)磁(ci)力把(ba)關閉(bi)件從(cong)閥座上(shang)提起,閥門(men)打開;斷電(dian)時(shi),電(dian)磁(ci)力消失,彈簧把(ba)關閉(bi)件壓在閥座上(shang),閥門(men)關閉(bi)。
特點(dian):在真(zhen)空、負壓、零壓時能正常工作(zuo),但通徑一般不超過(guo)25mm。
分布直動(dong)式(shi)電磁閥:
原理:它是一(yi)種(zhong)直動(dong)和先(xian)(xian)(xian)導式相(xiang)結合(he)的原理,當入(ru)口(kou)(kou)與出口(kou)(kou)沒(mei)有(you)壓(ya)(ya)(ya)(ya)差(cha)(cha)(cha)時(shi),通電后(hou),電磁力(li)(li)(li)直接把先(xian)(xian)(xian)導小(xiao)(xiao)閥(fa)和主(zhu)閥(fa)關(guan)(guan)閉(bi)件依次(ci)向上(shang)提(ti)起,閥(fa)門打(da)開。當入(ru)口(kou)(kou)與出口(kou)(kou)達到啟動(dong)壓(ya)(ya)(ya)(ya)差(cha)(cha)(cha)時(shi),通電后(hou),電磁力(li)(li)(li)先(xian)(xian)(xian)導小(xiao)(xiao)閥(fa),主(zhu)閥(fa)下腔壓(ya)(ya)(ya)(ya)力(li)(li)(li)上(shang)升(sheng),上(shang)腔壓(ya)(ya)(ya)(ya)力(li)(li)(li)下降,從而利(li)用(yong)壓(ya)(ya)(ya)(ya)差(cha)(cha)(cha)把主(zhu)閥(fa)向上(shang)推(tui)開;斷(duan)電時(shi),先(xian)(xian)(xian)導閥(fa)利(li)用(yong)彈簧力(li)(li)(li)或介質壓(ya)(ya)(ya)(ya)力(li)(li)(li)推(tui)動(dong)關(guan)(guan)閉(bi)件,向下移(yi)動(dong),使閥(fa)門關(guan)(guan)閉(bi)。
特點:在零壓差或真空(kong)、高壓時亦能可*動作,但功率較(jiao)大,要求(qiu)必須水(shui)平安裝。
先導式電磁閥:
原理:通電(dian)時,電(dian)磁(ci)力(li)(li)把先導孔打(da)開(kai),上(shang)腔室(shi)(shi)壓力(li)(li)迅(xun)速(su)下降,在關(guan)閉(bi)件(jian)(jian)(jian)周(zhou)圍形成上(shang)低(di)下高的壓差,流(liu)體(ti)壓力(li)(li)推動(dong)關(guan)閉(bi)件(jian)(jian)(jian)向上(shang)移(yi)動(dong),閥(fa)門(men)打(da)開(kai);斷電(dian)時,彈簧力(li)(li)把先導孔關(guan)閉(bi),入口壓力(li)(li)通過旁通孔迅(xun)速(su)腔室(shi)(shi)在關(guan)閥(fa)件(jian)(jian)(jian)周(zhou)圍形成下低(di)上(shang)高的壓差,流(liu)體(ti)壓力(li)(li)推動(dong)關(guan)閉(bi)件(jian)(jian)(jian)向下移(yi)動(dong),關(guan)閉(bi)閥(fa)門(men)。
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