補(bu)償(chang)器習慣上(shang)(shang)也(ye)(ye)叫膨(peng)脹節(jie)，或伸(shen)縮(suo)節(jie)。由構(gou)成其(qi)工(gong)作(zuo)(zuo)主體(ti)的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種(zhong)(zhong)彈性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬(shu)于一(yi)種(zhong)(zhong)補(bu)償(chang)元(yuan)件(jian)。利用其(qi)工(gong)作(zuo)(zuo)主體(ti)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(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)、容器等由熱脹冷縮(suo)等原因(yin)而(er)產(chan)生的(de)(de)尺寸變(bian)化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向、橫向和(he)角向位(wei)移。也(ye)(ye)可用于降(jiang)噪減振。在現(xian)代(dai)工(gong)業(ye)中用途廣(guang)泛(fan)。供熱上(shang)(shang)，為了防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時(shi)，由于熱伸(shen)長或溫度應(ying)力而(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形或破壞，需(xu)要(yao)在管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)設置補(bu)償(chang)器，以補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱伸(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)作(zuo)(zuo)用在閥件(jian)或支架(jia)結構(gou)上(shang)(shang)的(de)(de)作(zuo)(zuo)用力。