補償(chang)器習(xi)慣上(shang)也(ye)叫(jiao)膨脹(zhang)(zhang)節(jie)，或(huo)伸(shen)(shen)縮節(jie)。由(you)構(gou)成其(qi)工(gong)作(zuo)(zuo)主(zhu)體的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附(fu)件組成。 屬于(yu)(yu)一種(zhong)補償(chang)元件。利用(yong)(yong)其(qi)工(gong)作(zuo)(zuo)主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)(shen)縮變形，以吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等(deng)由(you)熱(re)脹(zhang)(zhang)冷縮等(deng)原因而(er)產生的(de)(de)(de)尺(chi)寸變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器等(deng)的(de)(de)(de)軸向、橫向和角向位移。也(ye)可用(yong)(yong)于(yu)(yu)降噪減(jian)振。在(zai)現(xian)代工(gong)業(ye)中(zhong)用(yong)(yong)途(tu)廣泛。供(gong)熱(re)上(shang)，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于(yu)(yu)熱(re)伸(shen)(shen)長或(huo)溫(wen)度應力(li)(li)而(er)引起管(guan)(guan)(guan)(guan)道(dao)變形或(huo)破(po)壞，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)熱(re)伸(shen)(shen)長，從而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力(li)(li)和作(zuo)(zuo)用(yong)(yong)在(zai)閥件或(huo)支(zhi)架結構(gou)上(shang)的(de)(de)(de)作(zuo)(zuo)用(yong)(yong)力(li)(li)。