補(bu)償(chang)器(qi)習(xi)慣上(shang)也叫膨脹(zhang)節(jie)，或(huo)(huo)伸縮(suo)節(jie)。由構成(cheng)其工(gong)作(zuo)(zuo)主體(ti)的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元件(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 屬于(yu)一種(zhong)補(bu)償(chang)元件(jian)(jian)。利用(yong)其工(gong)作(zuo)(zuo)主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)有效伸縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)由熱(re)脹(zhang)冷縮(suo)等(deng)原(yuan)因而(er)產生(sheng)的(de)尺寸變(bian)化，或(huo)(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)的(de)軸向(xiang)、橫向(xiang)和(he)(he)角(jiao)向(xiang)位移。也可用(yong)于(yu)降噪減振。在現代工(gong)業中用(yong)途(tu)廣泛。供熱(re)上(shang)，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由于(yu)熱(re)伸長或(huo)(huo)溫(wen)度應(ying)力(li)(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)器(qi)，以補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸長，從而(er)減小(xiao)管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)應(ying)力(li)(li)和(he)(he)作(zuo)(zuo)用(yong)在閥件(jian)(jian)或(huo)(huo)支(zhi)架結構上(shang)的(de)作(zuo)(zuo)用(yong)力(li)(li)。