補(bu)償(chang)(chang)器習慣(guan)上(shang)也叫膨脹(zhang)節(jie)，或伸(shen)(shen)縮節(jie)。由構(gou)成其(qi)工(gong)作主體的(de)波(bo)紋(wen)管(guan)(guan)(guan)（一種(zhong)彈性元件(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)(guan)等附件(jian)(jian)組成。 屬于一種(zhong)補(bu)償(chang)(chang)元件(jian)(jian)。利用(yong)(yong)其(qi)工(gong)作主體波(bo)紋(wen)管(guan)(guan)(guan)的(de)有效伸(shen)(shen)縮變形，以吸收管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容(rong)器等由熱(re)脹(zhang)冷(leng)縮等原因而產生的(de)尺(chi)寸(cun)變化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容(rong)器等的(de)軸向(xiang)、橫向(xiang)和(he)(he)角向(xiang)位移。也可用(yong)(yong)于降噪(zao)減振。在現代工(gong)業中用(yong)(yong)途廣泛。供熱(re)上(shang)，為了防(fang)止供熱(re)管(guan)(guan)(guan)道升溫時，由于熱(re)伸(shen)(shen)長或溫度應力而引起管(guan)(guan)(guan)道變形或破壞(huai)，需要在管(guan)(guan)(guan)道上(shang)設置補(bu)償(chang)(chang)器，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道的(de)熱(re)伸(shen)(shen)長，從而減小管(guan)(guan)(guan)壁的(de)應力和(he)(he)作用(yong)(yong)在閥件(jian)(jian)或支架(jia)結構(gou)上(shang)的(de)作用(yong)(yong)力。