補償(chang)(chang)器(qi)(qi)習慣上也叫膨脹節，或(huo)伸(shen)縮節。由(you)構成(cheng)其(qi)工(gong)(gong)作(zuo)主體(ti)的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成(cheng)。 屬于(yu)一種(zhong)補償(chang)(chang)元件(jian)。利用其(qi)工(gong)(gong)作(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)由(you)熱(re)(re)脹冷(leng)縮等(deng)(deng)原因而產(chan)生的(de)(de)尺寸變(bian)化，或(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)的(de)(de)軸向、橫向和(he)角向位移(yi)。也可(ke)用于(yu)降噪減振。在現代工(gong)(gong)業中用途廣(guang)泛。供(gong)熱(re)(re)上，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱(re)(re)伸(shen)長或(huo)溫度應力而引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)破(po)壞，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上設置補償(chang)(chang)器(qi)(qi)，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)(re)伸(shen)長，從(cong)而減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力和(he)作(zuo)用在閥件(jian)或(huo)支架結構上的(de)(de)作(zuo)用力。