補償(chang)(chang)(chang)器(qi)習慣上(shang)也叫膨(peng)脹節，或(huo)伸縮(suo)(suo)節。由構(gou)(gou)成其工(gong)作(zuo)主體的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于一種(zhong)補償(chang)(chang)(chang)元件(jian)。利用(yong)其工(gong)作(zuo)主體波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸縮(suo)(suo)變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由熱(re)(re)脹冷縮(suo)(suo)等(deng)原因而產生的(de)(de)尺寸(cun)變(bian)化(hua)，或(huo)補償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)(de)軸向、橫向和(he)(he)角向位移。也可用(yong)于降(jiang)噪減振(zhen)。在(zai)(zai)現代工(gong)業(ye)中(zhong)用(yong)途廣(guang)泛。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱(re)(re)伸長(chang)或(huo)溫度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)破(po)壞，需要在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償(chang)(chang)(chang)器(qi)，以(yi)補償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸長(chang)，從(cong)而減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)(he)作(zuo)用(yong)在(zai)(zai)閥件(jian)或(huo)支架結構(gou)(gou)上(shang)的(de)(de)作(zuo)用(yong)力。