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(shao)量(liang)彎(wan)曲。圖2為常見(jian)的(de)(de)軸向式波(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹節(jie)，用(yong)(yong)在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)進行(xing)軸向長度(du)補償。為了防止超過(guo)允許的(de)(de)補償量(liang)，在(zai)波(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)兩(liang)端設(she)置(zhi)有保(bao)護拉桿或保(bao)護環(huan)，在(zai)與(yu)它連(lian)接的(de)(de)兩(liang)端管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置(zhi)導向支架。另(ling)外還有轉角(jiao)式和(he)橫向式膨(peng)(peng)脹節(jie)，可用(yong)(yong)來補償管(guan)(guan)(guan)(guan)道(dao)的(de)(de)轉角(jiao)變形(xing)和(he)橫向變形(xing)。這類膨(peng)(peng)脹節(jie)的(de)(de)優點是節(jie)省空間，節(jie)約材料，便于標準(zhun)化和(he)批量(liang)生(sheng)產，缺點是壽(shou)命(ming)較(jiao)短(duan)。波(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹節(jie)一般用(yong)(yong)于溫度(du)和(he)壓(ya)力(li)不很(hen)高(gao)、長度(du)較(jiao)短(duan)的(de)(de)管(guan)(guan)(guan)(guan)道(dao)上(shang)。隨著(zhu)波(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)生(sheng)產技術水平的(de)(de)提高(gao)，這類膨(peng)(peng)脹節(jie)的(de)(de)應用(yong)(yong)范圍正(zheng)在(zai)擴大。目前，波(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)膨(peng)(peng)脹節(jie)可用(yong)(yong)在(zai)最(zui)高(gao)壓(ya)力(li)6.0兆帕的(de)(de)管(guan)(guan)(guan)(guan)系中。