補償(chang)(chang)器習慣上也叫膨脹節，或(huo)伸縮節。由(you)構成其工(gong)作(zuo)(zuo)主(zhu)體的(de)(de)波(bo)(bo)紋管(guan)(guan)(guan)(guan)(guan)（一種(zhong)(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)附件組成。 屬于(yu)一種(zhong)(zhong)補償(chang)(chang)元件。利(li)用(yong)(yong)其工(gong)作(zuo)(zuo)主(zhu)體波(bo)(bo)紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)脹冷縮等(deng)原因而(er)產生的(de)(de)尺寸變化，或(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向、橫向和角向位移。也可用(yong)(yong)于(yu)降噪減振。在(zai)現代工(gong)業中(zhong)用(yong)(yong)途(tu)廣泛(fan)。供熱(re)上，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于(yu)熱(re)伸長(chang)(chang)或(huo)溫(wen)度應(ying)力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)道上設置補償(chang)(chang)器，以(yi)補償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸長(chang)(chang)，從(cong)而(er)減小管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應(ying)力(li)和作(zuo)(zuo)用(yong)(yong)在(zai)閥(fa)件或(huo)支(zhi)架結構上的(de)(de)作(zuo)(zuo)用(yong)(yong)力(li)。