補償(chang)(chang)器習慣上也(ye)叫膨脹節，或伸縮(suo)節。由(you)構成(cheng)其工(gong)作(zuo)主體的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈(dan)性(xing)元件）和端管(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)等附件組成(cheng)。 屬于一(yi)種(zhong)補償(chang)(chang)元件。利用(yong)其工(gong)作(zuo)主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮(suo)變(bian)形，以(yi)吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等由(you)熱脹冷縮(suo)等原因而(er)產生(sheng)的(de)(de)尺寸變(bian)化，或補償(chang)(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等的(de)(de)軸向、橫向和角向位(wei)移。也(ye)可用(yong)于降噪減(jian)振。在(zai)現(xian)代工(gong)業中用(yong)途(tu)廣(guang)泛(fan)。供(gong)熱上，為了防止(zhi)供(gong)熱管(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于熱伸長(chang)或溫(wen)度應(ying)力(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上設置補償(chang)(chang)器，以(yi)補償(chang)(chang)管(guan)(guan)(guan)(guan)道的(de)(de)熱伸長(chang)，從而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應(ying)力(li)和作(zuo)用(yong)在(zai)閥件或支架結構上的(de)(de)作(zuo)用(yong)力(li)。