補償(chang)器習慣上(shang)也叫膨脹節，或(huo)伸縮(suo)節。由(you)構成(cheng)其工(gong)作主體(ti)的波紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈(dan)性元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成(cheng)。 屬于一種補償(chang)元件(jian)。利用(yong)其工(gong)作主體(ti)波紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的有效伸縮(suo)變形(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱(re)脹冷縮(suo)等原(yuan)因而產(chan)生的尺寸變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的軸向、橫向和(he)(he)角向位移。也可(ke)用(yong)于降噪減(jian)振。在(zai)現(xian)代工(gong)業中用(yong)途(tu)廣泛。供熱(re)上(shang)，為了(le)防止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由(you)于熱(re)伸長(chang)或(huo)溫(wen)度應(ying)力而引起管(guan)(guan)(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的熱(re)伸長(chang)，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的應(ying)力和(he)(he)作用(yong)在(zai)閥件(jian)或(huo)支(zhi)架(jia)結構上(shang)的作用(yong)力。