三(san)通為(wei)管(guan)(guan)(guan)件(jian)、管(guan)(guan)(guan)道連接件(jian)。又叫管(guan)(guan)(guan)件(jian)三(san)通或者三(san)通管(guan)(guan)(guan)件(jian)，三(san)通接頭，用在(zai)主管(guan)(guan)(guan)道要分支管(guan)(guan)(guan)處。

　　三(san)通(tong)(tong)是(shi)具有三(san)個(ge)口(kou)子，即(ji)一(yi)(yi)個(ge)進口(kou)，兩(liang)個(ge)出口(kou)；或(huo)兩(liang)個(ge)進口(kou)，一(yi)(yi)個(ge)出口(kou)的(de)一(yi)(yi)種化工管件，有T形與(yu)Y形，有等徑管口(kou)，也有異徑管口(kou)，用(yong)于三(san)條(tiao)相同或(huo)不同管路匯(hui)集處。三(san)通(tong)(tong)的(de)主要作(zuo)用(yong)是(shi)改(gai)變流體(ti)方向的(de)。

　　不銹(xiu)(xiu)鋼三通(tong)(tong)是用(yong)(yong)于管(guan)(guan)(guan)(guan)道分支處的(de)(de)一(yi)種管(guan)(guan)(guan)(guan)件(jian)。對于采(cai)(cai)用(yong)(yong)無縫管(guan)(guan)(guan)(guan)制造三通(tong)(tong)來(lai)講，目前通(tong)(tong)常(chang)所(suo)采(cai)(cai)用(yong)(yong)的(de)(de)工藝有液(ye)(ye)(ye)壓(ya)(ya)脹(zhang)形和(he)熱壓(ya)(ya)成形兩種。不銹(xiu)(xiu)鋼三通(tong)(tong)的(de)(de)液(ye)(ye)(ye)壓(ya)(ya)脹(zhang)形是通(tong)(tong)過金屬材料的(de)(de)軸向補償脹(zhang)出(chu)支管(guan)(guan)(guan)(guan)的(de)(de)一(yi)種成形工藝。其過程是采(cai)(cai)用(yong)(yong)專用(yong)(yong)液(ye)(ye)(ye)壓(ya)(ya)機(ji)，將與三通(tong)(tong)直徑相等的(de)(de)管(guan)(guan)(guan)(guan)坯內注入液(ye)(ye)(ye)體(ti)，通(tong)(tong)過液(ye)(ye)(ye)壓(ya)(ya)機(ji)的(de)(de)兩個水(shui)平(ping)側缸(gang)同步(bu)對中運(yun)動擠壓(ya)(ya)管(guan)(guan)(guan)(guan)坯，管(guan)(guan)(guan)(guan)坯受擠壓(ya)(ya)后體(ti)積(ji)變(bian)小，管(guan)(guan)(guan)(guan)坯內的(de)(de)液(ye)(ye)(ye)體(ti)隨(sui)管(guan)(guan)(guan)(guan)坯體(ti)積(ji)變(bian)小而(er)壓(ya)(ya)力(li)(li)升高，當(dang)達(da)到(dao)不銹(xiu)(xiu)鋼三通(tong)(tong)支管(guan)(guan)(guan)(guan)脹(zhang)出(chu)所(suo)需要的(de)(de)壓(ya)(ya)力(li)(li)時，金屬材料在側缸(gang)和(he)管(guan)(guan)(guan)(guan)坯內液(ye)(ye)(ye)體(ti)壓(ya)(ya)力(li)(li)的(de)(de)雙重作(zuo)用(yong)(yong)下沿模(mo)具內腔(qiang)流動而(er)脹(zhang)出(chu)支管(guan)(guan)(guan)(guan)

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