補償器習慣上(shang)也叫(jiao)膨(peng)脹(zhang)節，或伸(shen)(shen)縮(suo)節。由構(gou)成其工(gong)(gong)作(zuo)主(zhu)體的(de)(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈性元(yuan)件）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件組成。 屬于一種補償元(yuan)件。利用(yong)(yong)(yong)其工(gong)(gong)作(zuo)主(zhu)體波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效(xiao)伸(shen)(shen)縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱脹(zhang)冷縮(suo)等原因而產生的(de)(de)(de)尺寸(cun)變(bian)化(hua)，或補償管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)(de)軸向、橫(heng)向和角向位(wei)移。也可(ke)用(yong)(yong)(yong)于降噪減(jian)振。在現(xian)代工(gong)(gong)業中用(yong)(yong)(yong)途廣(guang)泛。供(gong)熱上(shang)，為(wei)了(le)防止供(gong)熱管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱伸(shen)(shen)長(chang)(chang)或溫度應力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)熱伸(shen)(shen)長(chang)(chang)，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力和作(zuo)用(yong)(yong)(yong)在閥(fa)件或支(zhi)架(jia)結構(gou)上(shang)的(de)(de)(de)作(zuo)用(yong)(yong)(yong)力。