補(bu)償(chang)(chang)器(qi)(qi)習慣上(shang)也叫(jiao)膨脹節(jie)，或(huo)伸(shen)縮節(jie)。由(you)構(gou)成其(qi)工作(zuo)主體(ti)的波(bo)紋(wen)管(guan)(guan)(guan)（一(yi)種(zhong)彈性元件(jian)）和(he)端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等附件(jian)組成。 屬(shu)于(yu)一(yi)種(zhong)補(bu)償(chang)(chang)元件(jian)。利用(yong)(yong)其(qi)工作(zuo)主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)的有(you)效伸(shen)縮變(bian)形，以吸(xi)收管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器(qi)(qi)等由(you)熱(re)脹冷(leng)縮等原因而產生的尺寸變(bian)化，或(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器(qi)(qi)等的軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可(ke)用(yong)(yong)于(yu)降噪減振。在現代工業(ye)中(zhong)用(yong)(yong)途廣(guang)泛。供(gong)熱(re)上(shang)，為了防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)道升溫(wen)時，由(you)于(yu)熱(re)伸(shen)長(chang)或(huo)溫(wen)度(du)應(ying)力而引起管(guan)(guan)(guan)道變(bian)形或(huo)破壞(huai)，需要(yao)在管(guan)(guan)(guan)道上(shang)設置補(bu)償(chang)(chang)器(qi)(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道的熱(re)伸(shen)長(chang)，從而減小管(guan)(guan)(guan)壁(bi)的應(ying)力和(he)作(zuo)用(yong)(yong)在閥件(jian)或(huo)支架結構(gou)上(shang)的作(zuo)用(yong)(yong)力。