補(bu)償(chang)器習慣上也叫膨(peng)脹節，或伸(shen)縮節。由構成其工作(zuo)(zuo)主體的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成。 屬(shu)于一種補(bu)償(chang)元件(jian)。利(li)用(yong)(yong)(yong)其工作(zuo)(zuo)主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效(xiao)伸(shen)縮變形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)由熱脹冷縮等(deng)(deng)原因而產生的(de)(de)尺寸變化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)的(de)(de)軸向、橫向和(he)(he)角向位移。也可用(yong)(yong)(yong)于降噪(zao)減振。在(zai)現(xian)代工業中用(yong)(yong)(yong)途廣泛。供熱上，為了防(fang)止供熱管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于熱伸(shen)長或溫(wen)度應力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形或破壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)器，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力和(he)(he)作(zuo)(zuo)用(yong)(yong)(yong)在(zai)閥件(jian)或支架結構上的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)力。