補(bu)償(chang)器(qi)習慣上也叫膨脹節(jie)，或伸(shen)縮節(jie)。由(you)構成(cheng)其工作主體(ti)的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元(yuan)件(jian)(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附(fu)件(jian)(jian)(jian)組成(cheng)。 屬(shu)于一種(zhong)補(bu)償(chang)元(yuan)件(jian)(jian)(jian)。利用(yong)(yong)(yong)其工作主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮變形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)由(you)熱脹冷縮等(deng)原(yuan)因而產(chan)生的(de)(de)尺寸變化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)的(de)(de)軸向、橫向和(he)(he)角向位(wei)移(yi)。也可用(yong)(yong)(yong)于降噪減(jian)振。在(zai)現(xian)代工業中用(yong)(yong)(yong)途廣泛。供熱上，為(wei)了防止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升(sheng)溫時，由(you)于熱伸(shen)長或溫度應力(li)而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變形或破壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上設(she)置補(bu)償(chang)器(qi)，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)熱伸(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力(li)和(he)(he)作用(yong)(yong)(yong)在(zai)閥件(jian)(jian)(jian)或支架(jia)結構上的(de)(de)作用(yong)(yong)(yong)力(li)。