補償(chang)(chang)(chang)(chang)器(qi)(qi)習(xi)慣上(shang)也(ye)叫膨脹節，或伸(shen)縮(suo)節。由構(gou)成其工(gong)(gong)作(zuo)(zuo)主體的(de)波紋管(guan)(guan)(guan)(guan)（一(yi)(yi)種彈性元(yuan)件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等附件(jian)組(zu)成。 屬于(yu)(yu)一(yi)(yi)種補償(chang)(chang)(chang)(chang)元(yuan)件(jian)。利用(yong)(yong)(yong)其工(gong)(gong)作(zuo)(zuo)主體波紋管(guan)(guan)(guan)(guan)的(de)有效伸(shen)縮(suo)變形，以吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等由熱(re)脹冷(leng)縮(suo)等原(yuan)因而(er)產(chan)生的(de)尺寸變化，或補償(chang)(chang)(chang)(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)(qi)等的(de)軸(zhou)向、橫向和(he)(he)角(jiao)向位移。也(ye)可用(yong)(yong)(yong)于(yu)(yu)降(jiang)噪減(jian)振(zhen)。在(zai)現代工(gong)(gong)業中(zhong)用(yong)(yong)(yong)途(tu)廣泛。供(gong)熱(re)上(shang)，為了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)(yu)熱(re)伸(shen)長或溫(wen)度應力而(er)引起管(guan)(guan)(guan)(guan)道變形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置(zhi)補償(chang)(chang)(chang)(chang)器(qi)(qi)，以補償(chang)(chang)(chang)(chang)管(guan)(guan)(guan)(guan)道的(de)熱(re)伸(shen)長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)應力和(he)(he)作(zuo)(zuo)用(yong)(yong)(yong)在(zai)閥(fa)件(jian)或支架結構(gou)上(shang)的(de)作(zuo)(zuo)用(yong)(yong)(yong)力。