電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)三通(tong)球(qiu)(qiu)閥(fa)主要是啟閉件（球(qiu)(qiu)體）由閥(fa)桿帶動(dong)(dong)(dong)，并繞閥(fa)桿的軸線作旋(xuan)轉運(yun)動(dong)(dong)(dong)的閥(fa)門。運(yun)用(yong)在(zai)(zai)管道中(zhong)，用(yong)于(yu)切斷或者(zhe)控制管道中(zhong)介質(zhi)的流量與開(kai)閉與流向。也有很(hen)強的調節(jie)閥(fa)作用(yong)。目前(qian)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)三通(tong)球(qiu)(qiu)閥(fa)主要還分為不銹(xiu)鋼電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)球(qiu)(qiu)閥(fa)，法蘭電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)球(qiu)(qiu)閥(fa)，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)對夾(jia)式球(qiu)(qiu)閥(fa)，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)焊接(jie)球(qiu)(qiu)閥(fa)等一系(xi)列(lie)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)系(xi)列(lie)球(qiu)(qiu)閥(fa)，硬密封球(qiu)(qiu)閥(fa)在(zai)(zai)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)三通(tong)球(qiu)(qiu)閥(fa)上(shang)有比較突出的特性與認(ren)識。
內(nei)外(wai)泄漏(lou)是(shi)危及安全的(de)要(yao)素。其它自控(kong)閥(fa)通(tong)常(chang)將閥(fa)桿(gan)伸(shen)出，由(you)電動(dong)(dong)、氣動(dong)(dong)、液動(dong)(dong)執行機(ji)構控(kong)制閥(fa)芯(xin)的(de)轉動(dong)(dong)或(huo)移動(dong)(dong)。這都要(yao)解決長期(qi)動(dong)(dong)作閥(fa)桿(gan)動(dong)(dong)密封(feng)(feng)的(de)外(wai)泄漏(lou)難題；唯有電動(dong)(dong)三(san)通(tong)球(qiu)閥(fa)是(shi)用(yong)(yong)電磁力(li)作用(yong)(yong)于密封(feng)(feng)在(zai)隔(ge)磁套管內(nei)的(de)鐵芯(xin)完成(cheng)，不(bu)存在(zai)動(dong)(dong)密封(feng)(feng)，所(suo)以(yi)外(wai)漏(lou)易(yi)堵絕。電動(dong)(dong)閥(fa)力(li)矩(ju)控(kong)制不(bu)易(yi)，容易(yi)產生內(nei)漏(lou)，甚至拉斷閥(fa)桿(gan)頭部；電動(dong)(dong)三(san)通(tong)球(qiu)閥(fa)的(de)結構型式容易(yi)控(kong)制內(nei)泄漏(lou)，直(zhi)至降為(wei)零(ling)。所(suo)以(yi)，電動(dong)(dong)三(san)通(tong)球(qiu)閥(fa)使用(yong)(yong)特(te)別安全，尤其適用(yong)(yong)于腐蝕性、有毒或(huo)高低溫的(de)介(jie)質。
電動(dong)三(san)通(tong)球閥本身結(jie)構(gou)簡單，價(jia)格也低，比起(qi)調(diao)節(jie)閥等其它種類執(zhi)行器(qi)易于(yu)安裝維護(hu)。更顯著的是所組成的自控(kong)系(xi)統簡單得多(duo)，價(jia)格要低得多(duo)。由(you)于(yu)電動(dong)三(san)通(tong)球閥是開關信號控(kong)制，與工控(kong)計算(suan)機連接十分方便。在當今電腦(nao)普及(ji)，價(jia)格大幅下(xia)降的時代，電動(dong)三(san)通(tong)球閥的優勢就更加明顯。
