補(bu)償器習(xi)慣上也叫(jiao)膨(peng)脹節，或(huo)(huo)伸縮(suo)節。由構成(cheng)(cheng)其工(gong)(gong)作主體的(de)(de)(de)波(bo)(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性元件）和(he)(he)端(duan)管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法(fa)蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等附(fu)件組成(cheng)(cheng)。 屬于一(yi)種補(bu)償元件。利用(yong)(yong)(yong)其工(gong)(gong)作主體波(bo)(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸縮(suo)變形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱(re)(re)脹冷(leng)縮(suo)等原因(yin)而產生的(de)(de)(de)尺寸變化，或(huo)(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)(de)軸向(xiang)、橫向(xiang)和(he)(he)角向(xiang)位移。也可用(yong)(yong)(yong)于降噪減振。在(zai)現代工(gong)(gong)業中用(yong)(yong)(yong)途廣泛。供(gong)熱(re)(re)上，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱(re)(re)伸長或(huo)(huo)溫度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道變形或(huo)(huo)破壞，需要(yao)在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上設置(zhi)補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)(de)應(ying)力和(he)(he)作用(yong)(yong)(yong)在(zai)閥件或(huo)(huo)支架結(jie)構上的(de)(de)(de)作用(yong)(yong)(yong)力。