補(bu)償(chang)器習慣上也(ye)叫(jiao)膨脹節(jie)，或(huo)伸(shen)縮節(jie)。由構(gou)(gou)成其工(gong)(gong)(gong)作(zuo)主體(ti)的(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于(yu)一種補(bu)償(chang)元件(jian)。利用(yong)其工(gong)(gong)(gong)作(zuo)主體(ti)波紋(wen)管(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮變(bian)形，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器等由熱(re)脹冷縮等原因而產(chan)生(sheng)的(de)尺寸變(bian)化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)角(jiao)向(xiang)(xiang)位移。也(ye)可用(yong)于(yu)降(jiang)噪減(jian)振。在現代(dai)工(gong)(gong)(gong)業(ye)中(zhong)用(yong)途廣泛。供(gong)熱(re)上，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時(shi)，由于(yu)熱(re)伸(shen)長或(huo)溫度應力(li)而引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)破壞(huai)，需要(yao)在管(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)器，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)壁(bi)的(de)應力(li)和(he)作(zuo)用(yong)在閥(fa)件(jian)或(huo)支架(jia)結構(gou)(gou)上的(de)作(zuo)用(yong)力(li)。