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2為(wei)常見的(de)(de)軸向(xiang)(xiang)(xiang)式波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹(zhang)(zhang)(zhang)節,用(yong)在(zai)管(guan)(guan)(guan)(guan)道上(shang)進行軸向(xiang)(xiang)(xiang)長度(du)補償(chang)。為(wei)了防(fang)止超過允許的(de)(de)補償(chang)量(liang),在(zai)波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)兩(liang)端設置(zhi)有(you)保護拉桿或保護環,在(zai)與它(ta)連(lian)接的(de)(de)兩(liang)端管(guan)(guan)(guan)(guan)道上(shang)設置(zhi)導(dao)向(xiang)(xiang)(xiang)支架。另外還(huan)有(you)轉角式和(he)橫向(xiang)(xiang)(xiang)式膨(peng)(peng)脹(zhang)(zhang)(zhang)節,可用(yong)來補償(chang)管(guan)(guan)(guan)(guan)道的(de)(de)轉角變形和(he)橫向(xiang)(xiang)(xiang)變形。這類膨(peng)(peng)脹(zhang)(zhang)(zhang)節的(de)(de)優點(dian)是(shi)節省空間,節約材料(liao),便(bian)于標準化和(he)批量(liang)生產(chan),缺點(dian)是(shi)壽命較短。波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹(zhang)(zhang)(zhang)節一般用(yong)于溫(wen)度(du)和(he)壓(ya)(ya)力(li)不很高(gao)、長度(du)較短的(de)(de)管(guan)(guan)(guan)(guan)道上(shang)。隨著波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)生產(chan)技術水平的(de)(de)提(ti)高(gao),這類膨(peng)(peng)脹(zhang)(zhang)(zhang)節的(de)(de)應用(yong)范圍正在(zai)擴大。目前,波(bo)紋(wen)(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹(zhang)(zhang)(zhang)節可用(yong)在(zai)最高(gao)壓(ya)(ya)力(li)6.0兆帕的(de)(de)管(guan)(guan)(guan)(guan)系中。