三通为管件(jian)、管道连接件(jian)。又叫管件(jian)三通或者三通管件(jian)，三通接头，用在主管道要(yao)分支管处。

　　三(san)通是具有三(san)个口(kou)(kou)子，即一(yi)个进口(kou)(kou)，两(liang)个出口(kou)(kou)；或(huo)两(liang)个进口(kou)(kou)，一(yi)个出口(kou)(kou)的(de)一(yi)种化工管(guan)(guan)件，有T形(xing)与(yu)Y形(xing)，有等径管(guan)(guan)口(kou)(kou)，也有异(yi)径管(guan)(guan)口(kou)(kou)，用(yong)于(yu)三(san)条(tiao)相同或(huo)不(bu)同管(guan)(guan)路汇集处(chu)。三(san)通的(de)主要作用(yong)是改变流体(ti)方向的(de)。

　　不锈(xiu)钢三(san)通(tong)(tong)(tong)(tong)(tong)(tong)是(shi)用于管(guan)(guan)(guan)(guan)道分支(zhi)处的(de)(de)(de)一(yi)种管(guan)(guan)(guan)(guan)件。对于采(cai)(cai)用无缝(feng)管(guan)(guan)(guan)(guan)制(zhi)造三(san)通(tong)(tong)(tong)(tong)(tong)(tong)来讲，目前通(tong)(tong)(tong)(tong)(tong)(tong)常(chang)所采(cai)(cai)用的(de)(de)(de)工(gong)艺有液(ye)(ye)压(ya)(ya)胀形和(he)热压(ya)(ya)成形两(liang)种。不锈(xiu)钢三(san)通(tong)(tong)(tong)(tong)(tong)(tong)的(de)(de)(de)液(ye)(ye)压(ya)(ya)胀形是(shi)通(tong)(tong)(tong)(tong)(tong)(tong)过金属(shu)材料的(de)(de)(de)轴向补(bu)偿(chang)胀出(chu)支(zhi)管(guan)(guan)(guan)(guan)的(de)(de)(de)一(yi)种成形工(gong)艺。其过程是(shi)采(cai)(cai)用专用液(ye)(ye)压(ya)(ya)机(ji)，将(jiang)与三(san)通(tong)(tong)(tong)(tong)(tong)(tong)直径相等的(de)(de)(de)管(guan)(guan)(guan)(guan)坯(pi)内(nei)(nei)注入液(ye)(ye)体(ti)，通(tong)(tong)(tong)(tong)(tong)(tong)过液(ye)(ye)压(ya)(ya)机(ji)的(de)(de)(de)两(liang)个(ge)水(shui)平(ping)侧缸同步对中运动挤压(ya)(ya)管(guan)(guan)(guan)(guan)坯(pi)，管(guan)(guan)(guan)(guan)坯(pi)受挤压(ya)(ya)后体(ti)积(ji)变小，管(guan)(guan)(guan)(guan)坯(pi)内(nei)(nei)的(de)(de)(de)液(ye)(ye)体(ti)随(sui)管(guan)(guan)(guan)(guan)坯(pi)体(ti)积(ji)变小而压(ya)(ya)力升高，当达(da)到不锈(xiu)钢三(san)通(tong)(tong)(tong)(tong)(tong)(tong)支(zhi)管(guan)(guan)(guan)(guan)胀出(chu)所需要的(de)(de)(de)压(ya)(ya)力时，金属(shu)材料在侧缸和(he)管(guan)(guan)(guan)(guan)坯(pi)内(nei)(nei)液(ye)(ye)体(ti)压(ya)(ya)力的(de)(de)(de)双(shuang)重作(zuo)用下(xia)沿(yan)模具(ju)内(nei)(nei)腔(qiang)流动而胀出(chu)支(zhi)管(guan)(guan)(guan)(guan)

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