補償器習慣上(shang)也(ye)叫膨(peng)脹(zhang)節，或伸(shen)(shen)縮節。由構成其(qi)工作(zuo)主體的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)等附(fu)件(jian)組成。 屬(shu)于一(yi)種(zhong)補償元件(jian)。利用其(qi)工作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸(shen)(shen)縮變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等由熱脹(zhang)冷(leng)縮等原因而(er)產(chan)生的(de)(de)尺寸變(bian)化(hua)，或補償管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)角(jiao)向(xiang)(xiang)位移。也(ye)可用于降噪減(jian)振。在現代工業中用途廣泛。供(gong)熱上(shang)，為了防止供(gong)熱管(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱伸(shen)(shen)長(chang)或溫度應力而(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或破壞，需要在管(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱伸(shen)(shen)長(chang)，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力和(he)作(zuo)用在閥(fa)件(jian)或支架結構上(shang)的(de)(de)作(zuo)用力。