三(san)通(tong)(tong)为(wei)管(guan)件、管(guan)道(dao)连接(jie)件。又叫管(guan)件三(san)通(tong)(tong)或者三(san)通(tong)(tong)管(guan)件，三(san)通(tong)(tong)接(jie)头，用在主管(guan)道(dao)要分(fen)支管(guan)处。

　　三通是具有三个口(kou)(kou)子，即一(yi)个进口(kou)(kou)，两个出(chu)口(kou)(kou)；或两个进口(kou)(kou)，一(yi)个出(chu)口(kou)(kou)的一(yi)种化工(gong)管(guan)件，有T形(xing)与Y形(xing)，有等径管(guan)口(kou)(kou)，也有异径管(guan)口(kou)(kou)，用(yong)(yong)于三条相同或不(bu)同管(guan)路汇集处。三通的主要(yao)作用(yong)(yong)是改(gai)变流体方向(xiang)的。

　　不锈钢三(san)(san)通(tong)是(shi)用(yong)于管(guan)(guan)(guan)(guan)道分支(zhi)处的(de)一种(zhong)管(guan)(guan)(guan)(guan)件。对于采用(yong)无缝(feng)管(guan)(guan)(guan)(guan)制造三(san)(san)通(tong)来讲(jiang)，目前通(tong)常(chang)所(suo)采用(yong)的(de)工(gong)(gong)艺有液(ye)压(ya)(ya)(ya)(ya)胀形(xing)(xing)和热压(ya)(ya)(ya)(ya)成形(xing)(xing)两种(zhong)。不锈钢三(san)(san)通(tong)的(de)液(ye)压(ya)(ya)(ya)(ya)胀形(xing)(xing)是(shi)通(tong)过金属材(cai)料的(de)轴向补偿胀出(chu)(chu)支(zhi)管(guan)(guan)(guan)(guan)的(de)一种(zhong)成形(xing)(xing)工(gong)(gong)艺。其过程是(shi)采用(yong)专用(yong)液(ye)压(ya)(ya)(ya)(ya)机(ji)，将与三(san)(san)通(tong)直径(jing)相(xiang)等的(de)管(guan)(guan)(guan)(guan)坯内注入(ru)液(ye)体(ti)，通(tong)过液(ye)压(ya)(ya)(ya)(ya)机(ji)的(de)两个水平侧缸同步对中运动(dong)挤压(ya)(ya)(ya)(ya)管(guan)(guan)(guan)(guan)坯，管(guan)(guan)(guan)(guan)坯受挤压(ya)(ya)(ya)(ya)后体(ti)积变小，管(guan)(guan)(guan)(guan)坯内的(de)液(ye)体(ti)随管(guan)(guan)(guan)(guan)坯体(ti)积变小而压(ya)(ya)(ya)(ya)力(li)升高(gao)，当达(da)到(dao)不锈钢三(san)(san)通(tong)支(zhi)管(guan)(guan)(guan)(guan)胀出(chu)(chu)所(suo)需(xu)要(yao)的(de)压(ya)(ya)(ya)(ya)力(li)时(shi)，金属材(cai)料在侧缸和管(guan)(guan)(guan)(guan)坯内液(ye)体(ti)压(ya)(ya)(ya)(ya)力(li)的(de)双重作(zuo)用(yong)下沿模(mo)具(ju)内腔流动(dong)而胀出(chu)(chu)支(zhi)管(guan)(guan)(guan)(guan)

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