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波紋管膨脹節是用金屬波紋管制成的一種膨脹節。它能沿管道軸線方向伸縮,也允許少量(liang)彎曲。圖(tu)2為常見的(de)(de)(de)(de)軸(zhou)向(xiang)式(shi)波(bo)(bo)紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)(peng)脹(zhang)節,用(yong)(yong)在(zai)管(guan)(guan)(guan)道(dao)(dao)(dao)上進行軸(zhou)向(xiang)長度補(bu)償(chang)。為了防(fang)止(zhi)超過允許的(de)(de)(de)(de)補(bu)償(chang)量(liang),在(zai)波(bo)(bo)紋(wen)(wen)(wen)管(guan)(guan)(guan)兩(liang)端(duan)設置有保護拉桿或(huo)保護環,在(zai)與它連接的(de)(de)(de)(de)兩(liang)端(duan)管(guan)(guan)(guan)道(dao)(dao)(dao)上設置導向(xiang)支架。另外(wai)還(huan)有轉(zhuan)角式(shi)和橫向(xiang)式(shi)膨(peng)(peng)脹(zhang)節,可用(yong)(yong)來補(bu)償(chang)管(guan)(guan)(guan)道(dao)(dao)(dao)的(de)(de)(de)(de)轉(zhuan)角變形和橫向(xiang)變形。這類(lei)膨(peng)(peng)脹(zhang)節的(de)(de)(de)(de)優點(dian)是(shi)節省空間,節約材料,便(bian)于標準化和批量(liang)生產,缺點(dian)是(shi)壽(shou)命較(jiao)短。波(bo)(bo)紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)(peng)脹(zhang)節一般用(yong)(yong)于溫(wen)度和壓力不(bu)很高(gao)、長度較(jiao)短的(de)(de)(de)(de)管(guan)(guan)(guan)道(dao)(dao)(dao)上。隨著波(bo)(bo)紋(wen)(wen)(wen)管(guan)(guan)(guan)生產技術水平的(de)(de)(de)(de)提高(gao),這類(lei)膨(peng)(peng)脹(zhang)節的(de)(de)(de)(de)應(ying)用(yong)(yong)范圍(wei)正在(zai)擴大(da)。目前,波(bo)(bo)紋(wen)(wen)(wen)管(guan)(guan)(guan)膨(peng)(peng)脹(zhang)節可用(yong)(yong)在(zai)最高(gao)壓力6.0兆(zhao)帕的(de)(de)(de)(de)管(guan)(guan)(guan)系中。