補(bu)(bu)償(chang)(chang)器習慣上也叫膨脹(zhang)節，或(huo)伸(shen)縮節。由(you)構(gou)成(cheng)(cheng)其(qi)工(gong)(gong)作(zuo)主體的(de)(de)(de)波紋管(guan)(guan)（一(yi)種彈性元(yuan)件(jian)(jian)）和(he)端管(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)等(deng)(deng)附件(jian)(jian)組成(cheng)(cheng)。 屬于一(yi)種補(bu)(bu)償(chang)(chang)元(yuan)件(jian)(jian)。利用其(qi)工(gong)(gong)作(zuo)主體波紋管(guan)(guan)的(de)(de)(de)有效伸(shen)縮變(bian)(bian)形，以吸(xi)收(shou)管(guan)(guan)線、導(dao)管(guan)(guan)、容器等(deng)(deng)由(you)熱(re)(re)(re)脹(zhang)冷縮等(deng)(deng)原因而產生的(de)(de)(de)尺寸變(bian)(bian)化，或(huo)補(bu)(bu)償(chang)(chang)管(guan)(guan)線、導(dao)管(guan)(guan)、容器等(deng)(deng)的(de)(de)(de)軸向(xiang)、橫(heng)向(xiang)和(he)角向(xiang)位(wei)移(yi)。也可用于降噪減振。在現代工(gong)(gong)業(ye)中(zhong)用途廣泛。供(gong)熱(re)(re)(re)上，為了防止供(gong)熱(re)(re)(re)管(guan)(guan)道升溫時，由(you)于熱(re)(re)(re)伸(shen)長或(huo)溫度應力(li)而引起管(guan)(guan)道變(bian)(bian)形或(huo)破壞，需(xu)要在管(guan)(guan)道上設置(zhi)補(bu)(bu)償(chang)(chang)器，以補(bu)(bu)償(chang)(chang)管(guan)(guan)道的(de)(de)(de)熱(re)(re)(re)伸(shen)長，從而減小管(guan)(guan)壁的(de)(de)(de)應力(li)和(he)作(zuo)用在閥件(jian)(jian)或(huo)支架結構(gou)上的(de)(de)(de)作(zuo)用力(li)。