補償(chang)器習慣上也叫膨脹(zhang)節，或(huo)(huo)伸(shen)(shen)縮節。由(you)(you)(you)構成(cheng)(cheng)其工(gong)作(zuo)主(zhu)體(ti)的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一(yi)種(zhong)(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)附件組成(cheng)(cheng)。 屬于(yu)(yu)一(yi)種(zhong)(zhong)補償(chang)元件。利用(yong)其工(gong)作(zuo)主(zhu)體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)有效伸(shen)(shen)縮變(bian)形，以(yi)(yi)吸(xi)收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)由(you)(you)(you)熱(re)(re)(re)脹(zhang)冷縮等(deng)原因而(er)產生的(de)尺寸變(bian)化，或(huo)(huo)補償(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)軸(zhou)向(xiang)(xiang)、橫向(xiang)(xiang)和角向(xiang)(xiang)位(wei)移。也可(ke)用(yong)于(yu)(yu)降噪減(jian)(jian)振(zhen)。在現代工(gong)業中用(yong)途廣泛。供熱(re)(re)(re)上，為了防止供熱(re)(re)(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)(you)(you)于(yu)(yu)熱(re)(re)(re)伸(shen)(shen)長或(huo)(huo)溫度應力(li)而(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破(po)壞，需要(yao)在管(guan)(guan)(guan)(guan)道(dao)上設置補償(chang)器，以(yi)(yi)補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)(re)伸(shen)(shen)長，從而(er)減(jian)(jian)小管(guan)(guan)(guan)(guan)壁的(de)應力(li)和作(zuo)用(yong)在閥件或(huo)(huo)支架結構上的(de)作(zuo)用(yong)力(li)。