補償(chang)(chang)器習慣上(shang)(shang)也叫膨(peng)脹(zhang)節，或(huo)伸縮節。由構成其(qi)工作(zuo)主(zhu)體的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于(yu)(yu)(yu)一種(zhong)補償(chang)(chang)元(yuan)件(jian)。利用其(qi)工作(zuo)主(zhu)體波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有效伸縮變形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由熱(re)(re)(re)脹(zhang)冷縮等原因而(er)產生(sheng)的(de)尺寸變化，或(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)軸向、橫(heng)向和(he)角(jiao)向位(wei)移。也可(ke)用于(yu)(yu)(yu)降噪(zao)減(jian)振。在(zai)現代工業中用途廣泛(fan)。供熱(re)(re)(re)上(shang)(shang)，為(wei)了防止供熱(re)(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由于(yu)(yu)(yu)熱(re)(re)(re)伸長或(huo)溫度(du)應力(li)(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)(li)和(he)作(zuo)用在(zai)閥(fa)件(jian)或(huo)支(zhi)架(jia)結構上(shang)(shang)的(de)作(zuo)用力(li)(li)。