補償(chang)器習慣上(shang)(shang)也(ye)(ye)叫(jiao)膨脹節，或伸(shen)縮(suo)節。由構成其(qi)工(gong)(gong)作主(zhu)體的(de)波紋管(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性元件）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)(deng)(deng)附件組成。 屬于(yu)一(yi)種(zhong)補償(chang)元件。利用其(qi)工(gong)(gong)作主(zhu)體波紋管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)(deng)原因而(er)產生的(de)尺寸變(bian)化，或補償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)(deng)的(de)軸(zhou)向、橫向和(he)角向位移。也(ye)(ye)可用于(yu)降噪(zao)減振。在(zai)現代工(gong)(gong)業中用途廣泛。供(gong)熱(re)上(shang)(shang)，為了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)熱(re)伸(shen)長或溫(wen)度(du)應力(li)(li)而(er)引起管(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)(shang)設(she)置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道的(de)熱(re)伸(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)壁(bi)的(de)應力(li)(li)和(he)作用在(zai)閥(fa)件或支(zhi)(zhi)架結構上(shang)(shang)的(de)作用力(li)(li)。