補償(chang)器習慣上也(ye)叫膨脹節，或(huo)伸(shen)縮(suo)節。由(you)構(gou)成(cheng)其(qi)工作主體(ti)的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性元件）和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件組成(cheng)。 屬于一(yi)種(zhong)補償(chang)元件。利(li)用(yong)(yong)其(qi)工作主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變(bian)形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由(you)熱脹冷縮(suo)等(deng)(deng)原(yuan)因(yin)而產(chan)生(sheng)的(de)尺寸變(bian)化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)軸向、橫向和(he)角向位移。也(ye)可(ke)用(yong)(yong)于降噪減(jian)振。在現(xian)代(dai)工業中用(yong)(yong)途廣(guang)泛。供熱上，為了(le)防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由(you)于熱伸(shen)長(chang)或(huo)溫(wen)度應力(li)而引起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形或(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道上設置(zhi)補償(chang)器，以(yi)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)熱伸(shen)長(chang)，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)和(he)作用(yong)(yong)在閥件或(huo)支架(jia)結構(gou)上的(de)作用(yong)(yong)力(li)。