補償(chang)器習(xi)慣(guan)上(shang)(shang)也(ye)叫膨脹節，或(huo)(huo)伸(shen)縮(suo)節。由構成(cheng)其(qi)工(gong)(gong)作(zuo)主體的(de)(de)(de)(de)波紋(wen)管(guan)(guan)（一種(zhong)彈(dan)性元件(jian)）和(he)端管(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬(shu)于一種(zhong)補償(chang)元件(jian)。利用(yong)(yong)其(qi)工(gong)(gong)作(zuo)主體波紋(wen)管(guan)(guan)的(de)(de)(de)(de)有效伸(shen)縮(suo)變形(xing)，以吸(xi)收管(guan)(guan)線(xian)、導(dao)管(guan)(guan)、容(rong)器等(deng)由熱(re)脹冷縮(suo)等(deng)原因而(er)產生的(de)(de)(de)(de)尺寸變化，或(huo)(huo)補償(chang)管(guan)(guan)線(xian)、導(dao)管(guan)(guan)、容(rong)器等(deng)的(de)(de)(de)(de)軸向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位移。也(ye)可用(yong)(yong)于降噪減(jian)振。在現代(dai)工(gong)(gong)業中(zhong)用(yong)(yong)途廣泛。供熱(re)上(shang)(shang)，為(wei)了防(fang)止供熱(re)管(guan)(guan)道升溫時，由于熱(re)伸(shen)長或(huo)(huo)溫度應力(li)而(er)引(yin)起(qi)管(guan)(guan)道變形(xing)或(huo)(huo)破壞，需要在管(guan)(guan)道上(shang)(shang)設(she)置補償(chang)器，以補償(chang)管(guan)(guan)道的(de)(de)(de)(de)熱(re)伸(shen)長，從而(er)減(jian)小管(guan)(guan)壁(bi)的(de)(de)(de)(de)應力(li)和(he)作(zuo)用(yong)(yong)在閥件(jian)或(huo)(huo)支架結構上(shang)(shang)的(de)(de)(de)(de)作(zuo)用(yong)(yong)力(li)。