補(bu)償(chang)(chang)(chang)器習(xi)慣上也叫膨脹(zhang)(zhang)節，或(huo)(huo)伸(shen)縮節。由(you)構成(cheng)其(qi)(qi)工(gong)作(zuo)主(zhu)體的(de)波紋(wen)管(guan)(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)）和端管(guan)(guan)(guan)、支架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬于(yu)一種(zhong)補(bu)償(chang)(chang)(chang)元(yuan)件(jian)。利用(yong)(yong)其(qi)(qi)工(gong)作(zuo)主(zhu)體波紋(wen)管(guan)(guan)(guan)的(de)有效(xiao)伸(shen)縮變形，以吸收(shou)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器等(deng)由(you)熱(re)脹(zhang)(zhang)冷縮等(deng)原因而(er)產(chan)生的(de)尺寸變化，或(huo)(huo)補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器等(deng)的(de)軸(zhou)向、橫向和角(jiao)向位移。也可用(yong)(yong)于(yu)降噪減振。在現代(dai)工(gong)業中用(yong)(yong)途(tu)廣泛(fan)。供熱(re)上，為了防止供熱(re)管(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于(yu)熱(re)伸(shen)長或(huo)(huo)溫(wen)度應(ying)力而(er)引起管(guan)(guan)(guan)道(dao)變形或(huo)(huo)破壞，需要在管(guan)(guan)(guan)道(dao)上設置(zhi)補(bu)償(chang)(chang)(chang)器，以補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)長，從而(er)減小管(guan)(guan)(guan)壁的(de)應(ying)力和作(zuo)用(yong)(yong)在閥件(jian)或(huo)(huo)支架(jia)結構上的(de)作(zuo)用(yong)(yong)力。