補(bu)償(chang)器(qi)習慣(guan)上(shang)也(ye)叫膨脹節(jie)，或伸(shen)(shen)縮(suo)節(jie)。由構(gou)成其(qi)(qi)工(gong)作主(zhu)(zhu)體的波紋(wen)管(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和端管(guan)(guan)(guan)(guan)、支(zhi)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)(yong)(yong)其(qi)(qi)工(gong)作主(zhu)(zhu)體波紋(wen)管(guan)(guan)(guan)(guan)的有效伸(shen)(shen)縮(suo)變形(xing)，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等由熱(re)(re)脹冷縮(suo)等原因而產(chan)生(sheng)的尺(chi)寸變化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器(qi)等的軸向(xiang)、橫(heng)向(xiang)和角向(xiang)位(wei)移(yi)。也(ye)可用(yong)(yong)(yong)于(yu)降噪減振。在現代工(gong)業(ye)中用(yong)(yong)(yong)途(tu)廣(guang)泛。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫時，由于(yu)熱(re)(re)伸(shen)(shen)長或溫度應(ying)力(li)而引起(qi)管(guan)(guan)(guan)(guan)道變形(xing)或破壞(huai)，需要在管(guan)(guan)(guan)(guan)道上(shang)設置補(bu)償(chang)器(qi)，以補(bu)償(chang)管(guan)(guan)(guan)(guan)道的熱(re)(re)伸(shen)(shen)長，從而減小管(guan)(guan)(guan)(guan)壁(bi)的應(ying)力(li)和作用(yong)(yong)(yong)在閥件(jian)或支(zhi)架(jia)結構(gou)上(shang)的作用(yong)(yong)(yong)力(li)。